Long Distance Carrier Code Assignments

LONG DISTANCE CARRIER CODE ASSIGNMENTS

Industry Analysis Division Common Carrier Bureau Federal Communications Commission June 1997

This report is available for reference in the Common Carrier Bureau's Public Reference Room, 2000 M Street, N.W., Room 575. Copies may be purchased by calling International Transcription Services, Inc. (ITS) at (202) 857-3800. The report can be downloaded [file name LDC1Q97.ZIP] from the FCC-State Link internet site at http://www.fcc.gov/ccb/stats on the World Wide Web. The report can also be downloaded from the FCC- State Link computer bulletin board system at (202) 418-0241. TABLE OF CONTENTS

TABLE 1. NUMBER OF CARRIER IDENTIFICATION CODES ASSIGNED BY BELL COMMUNICATIONS RESEARCH (FIRST QUARTER 1982 THROUGH FIRST QUARTER 1997) ...... 8

TABLE 2. LIST OF FGB CIC CODE ASSIGNMENTS, SORTED BY CIC CODE ...... 9

TABLE 3. LIST OF FGB CIC CODE ASSIGNMENTS, SORTED BY ENTITY ...... 16

TABLE 4. LIST OF FGD CIC CODE ASSIGNMENTS, SORTED BY CIC CODE ...... 23

TABLE 5. LIST OF FGD CIC CODE ASSIGNMENTS, SORTED BY ENTITY ...... 33

TABLE 6. 500 CODE BALANCE SHEET (AS OF MARCH 31, 1997) ...... 43

TABLE 7. NUMBER OF 500 CODES ASSIGNED (THIRD QUARTER 1994 THROUGH FIRST QUARTER 1997) ...... 43

TABLE 8. LIST OF 500 CODE ASSIGNMENTS SORTED BY CODE ...... 44

TABLE 9. LIST OF 500 CODE ASSIGNMENTS SORTED BY ENTITY ...... 48

TABLE 10. 555 LINE NUMBER BALANCE SHEET (AS OF MARCH 31, 1997) ...... 52

TABLE 11. NUMBER OF 555 LINE NUMBERS ASSIGNED (SECOND QUARTER 1994 THROUGH FIRST QUARTER 1997) ...... 52

TABLE 12. LIST OF 555 LINE NUMBER ASSIGNMENTS SORTED BY LINE NUMBER ...... 53

TABLE 13. LIST OF 555 LINE NUMBER ASSIGNMENTS SORTED BY ENTITY ...... 71

TABLE 14. TELEPHONE NUMBERS ASSIGNED FOR 800 SERVICE (APRIL 1993 THROUGH APRIL 1997) ...... 89

TABLE 15. TELEPHONE NUMBERS ASSIGNED FOR 888 SERVICE (FEBRUARY 1996 THROUGH APRIL 1997) ...... 90

TABLE 16. 900 CODE BALANCE SHEET (AS OF MARCH 31, 1997) ...... 91

TABLE 17. NUMBER OF 900 CODES ASSIGNED TO INTEREXCHANGE CARRIERS (FIRST QUARTER 1987 THROUGH FIRST QUARTER 1997) ...... 92

TABLE 18. LIST OF 900 CODE ASSIGNMENTS SORTED BY CODE ...... 93

TABLE 19. LIST OF 900 CODE ASSIGNMENTS SORTED BY ENTITY ...... 96 LONG DISTANCE CARRIER CODE ASSIGNMENTS

This report contains information on carrier identification codes (CICs) and other telecommunications numbering resources. The information in this report is used within the telephone industry and by users of telephone services for a variety of purposes. CICs are used within the telephone industry to, among other things, identify particular long distance carriers and other access customers in order to bill and route traffic to them. As part of carrier access codes, CICs are also used by customers to reach alternative carriers, such as "dial-around" long distance providers.

The separate codes assigned to providers of 500 and 900 services are used by local telephone companies to direct calls to the service provider. Both residential and business customers frequently seek information from the Commission about these codes to identify particular service providers.

Manufacturers require information on numbering resources to design and produce telecommunications equipment efficiently. Vendors of equipment frequently seek information on the growth of numbering resources to estimate potential demand. Major corporations and government agencies that operate their own telecommunications networks need information on numbering resources to efficiently interconnect their networks with the public switched network.

More generally, the evolution of numbering resources provides insight into the development of competition in the long distance market. This report presents brief background information on the administration of numbering resources and then summarizes the information specifically related to carrier identification codes, 500 service, 555 line number assignments, 800 and 888 service, and 900 service.

Numbering Resources Administration

The North American Numbering Plan (NANP) is the basic format for telephone numbers in the United States (including Puerto Rico, the Virgin Islands, Guam, and the Commonwealth of the Northern Mariana Islands), Canada, Bermuda and the following Caribbean countries: Anguilla, Antigua, Bahamas, Barbados, British Virgin Islands, Cayman Islands, Dominica, Dominican Republic, Grenada, Jamaica, Montserrat, St. Kitts & Nevis, St. Lucia, St. Vincent, Turks & Caicos Islands, and Trinidad & Tobago. Each telephone number within the NANP is a unique ten-digit number that consists of three parts. The first is a three-digit code -- the Numbering Plan Area or "NPA" code, which usually identifies a specific geographic area and is usually simply called an "area code". In other cases, the first three digits provide caller access to unique services (e.g., 500, 800, 888, and 900 service). The last two parts of each ten-digit number are a three-digit central office code and a four-digit line number. Together, these seven digits usually make up an ordinary local telephone number. In some cases, such as 500 and 900 service, the office code has special uses other than identifying the geographic location of a central office. In the following discussion, the three-digit central office code is sometimes referred to as the "office code" or the "NXX" code. Section 251 (e)(1) of the Telecommunications Act of 1996, which amends the Communications Act of 1934, requires that the Federal Communications Commission "create or designate one or more impartial entities to administer telecommunications numbering and to make such numbers available on an equitable basis." Section 251(e)(1) also clarifies that the FCC has "exclusive jurisdiction over those portions of the North American Numbering Plan that pertain to the United States . . . [but does not] preclude the Commission from delegating to State commissions or other entities all or any portion of such jurisdiction." The Network Services Division of the Commission's Common Carrier Bureau oversees numbering resource matters.

The NANP was introduced by AT&T in 1947. AT&T administered the NPA codes centrally, and the local exchange carriers administered the NXX codes and line numbers. After the AT&T divestiture in 1984, Bell Communications Research (Bellcore) assumed the centralized number administration functions.

On July 13, 1995, the Commission adopted a new model for administration of the NANP, announcing its intention to establish the North American Numbering Council (NANC), a federal advisory committee.1 The NANC will, among other tasks, advise the Commission and other NANP governments on numbering issues (such as local number portability implementation), recommend selection of and guide an impartial NANP Administrator, and conduct initial resolution of certain numbering disputes. The NANP Administrator selected by the NANC will process number resource applications and maintain administrative numbering databases. Operational details and additional activities of the NANP Administrator are to be determined by the NANC. Additional information about the NANC is available from the Commission's internet site at (http://www.fcc.gov/ccb/Nanc).

Carrier Identification Codes

CICs are numeric codes that, as originally devised, enabled local exchange carriers (LECs), as providers of interexchange access services, to identify access customers in order to bill and route traffic to such customers.2 Bellcore, as the current NANP Administrator, assigns these codes using guidelines developed by the Industry Carriers Compatibility Forum (ICCF), under the auspices of the Carrier Liaison Committee (CLC) which is sponsored by the Alliance for Telecommunications Solutions (ATIS), an industry forum. Currently, the Industry Numbering

1 See Administration of the North American Numbering Plan, CC Docket No. 92-237, Report and Order, 11 FCC Rcd 2588 (1995).

2 Access providers are typically local exchange carriers that provide access customers with circuits that interconnect to the local carrier's public switched telephone network. Access customers include interexchange carriers, wireless carriers, competitive access providers, and large corporate users. Commission rules require that "interstate access services should be made available on a non-discriminatory basis and, as far as possible, without distinction between end user and IC [interexchange carrier] customers." Petition of First Data Resources, Inc., Regarding the Availability of Feature Group B Access Service to End Users, Memorandum Opinion and Order, 1986 WL 291786, (1986), released May 28,1986 (First Data Resources Order) at para. 13.

2 Committee (INC), a subcommittee of the ICCF, develops these guidelines. The most recent version of these guidelines was issued in September 1996.3

Currently, CICs are used for purposes beyond those for which they were originally designed. CICs facilitate competition by enabling callers to use the services of any number of telecommunications service providers. For example, they enable callers to reach any carrier (presubscribed or otherwise) from any telephone, by dialing a carrier access code that includes a CIC.

The number of firms seeking and obtaining CICs provides the most useful information available on the entry of new firms into the long distance market. This is particularly the case for years prior to 1986, when the Commission decided that interstate access services should be made available on a non-discriminatory basis to end users as well as to interexchange carriers (IXCs).4 In addition, the CIC information is current: firms acquiring CICs for the first time are reported within 30 days.

An IXC or other access customer must have a CIC to purchase Feature Group D or Feature Group B interconnection access from a local telephone company.5 Feature Group D, which allows a customer of an IXC to place calls on a "1-plus" basis, is the "equal access" capability deployed by the Bell telephone companies following their divestiture from AT&T.6 Feature Group B differs somewhat from Feature Group D in that an IXC's customer must first dial 950 and then the four-digit CIC to place a call. The total number of CICs assigned thus reflects the number of firms seeking high-quality interconnection access arrangements with local telephone companies.

The growth in the number of CICs over time is shown in Table 1. As of March 31, 1997, 882 Feature Group B codes and 1,395 Feature Group D codes had been assigned. The firms holding Feature Group B codes are listed in Tables 2 and 3; those with Feature Group D codes are listed in Tables 4 and 5.

A number of firms that are not assigned a CIC may also offer long distance telecommunications services for sale. Typically, these firms resell the services provided by others. No accurate count of the number of these carriers is available. Other firms engaged in long distance

3 See Carrier Identification Code Assignment Guidelines, INC 95-0127-006, formerly ICCF 92-0726-002, Revision September 1996 (CIC Assignment Guidelines, September 1996).

4 See First Data Resources Order, cited above at n.2.

5 There are other interconnection access arrangements, not discussed in detail in this report, that do not require a CIC.

6 There currently exists a transition period concerning the conversion of Feature Group D codes from three-digits to four-digits. This period will end January 1, 1998. With three-digit codes, customers are able to dial 10XXX where XXX is the three-digit CIC. With the conversion of codes from three-digits to four-digits, customers will dial 101XXXX where XXXX is the four- digit CIC code.

3 telecommunications are not counted because they use special access or engage in selling transmission capacity to carriers and therefore do not need to acquire a CIC number.

As competition has developed, CICs, which initially were two digits in length, have been expanded to three and to four digits to assure there are enough CICs to meet the demand for them.7 As with area code changes, changing the number of digits in CICs requires advance planning and may require a transition period. Carriers may have to reprogram and upgrade network switches. Callers must be educated about the changes, equipment owners may need to reprogram and upgrade PBS switches, and manufacturers may need to develop new software and hardware for equipment owners and carriers. The Network Services Division of the Commission's Common Carrier Bureau addresses these matters.

500 Service

In 1993, a new set of codes for personal communications services was established.8 Area code 500 was designated for this purpose. One of the potential uses for 500 codes is that an individual or business can keep the same phone number (NXX-XXXX) if it moves from its central office code area (NXX), even to another state. Five hundred codes would thus allow non-geographic numbering.

Companies seeking to offer 500 service receive office codes, each of which can be used for 10,000 telephone numbers.9 All 500 calls that are dialed as 1-500-550-XXXX are routed to MCI, regardless of the last four digits dialed. Similarly, calls that are dialed as 1-500-288- XXXX are routed to AT&T. Because each of 1,000 office codes can be associated with 10,000 line numbers, there are theoretically 10,000,000 potential 500 numbers. As a practical matter, however, fewer than 80% of these potential numbers are usable. Telephone numbers that begin with a 1 or 0, for example, are not used.

Table 6 is a "balance sheet" for the assignment of 500 codes and the types of companies to which the codes are assigned. Table 7 shows the assignment of codes by quarter. The first 500 codes

7 The history of CIC expansion is outlined in the publication, Long Distance Carriers and Code Assignments, May 22, 1995, mimeo #53905.

8 The Industry Carriers Compatibility Forum (ICCF), an organization that develops guidelines of number administration, has defined Personal Communication Services as "a set of capabilities that allows some combination of personal mobility, terminal mobility and service profile management. It enables each personal communication service user to participate in a user- defined set of subscribed services, and initiate and/or receive calls on the basis of some combination of a personal number, terminal number, and a service profile across multiple networks at any terminal, fixed or mobile, irrespective of geographic location." Personal Communications Services (PCS) N100 NXX Code Assignment Guidelines, ICCF 93-1130-011, S.1.1. (Nov. 17, 1993). We note that PCS in the context of 500 service is distinct from the term PCS that refers to certain types of commercial mobile radio service.

9 The possible combinations of line number digits, from 0000 to 9999, yield 10,000 possible numbers for each office code.

4 were assigned August 10, 1994. As of March 31, 1997, 520 codes had been assigned. Tables 8 and 9 list the assignment of 500 office codes service providers within area code 500.

555 Line Numbers

The assignment of 555 line numbers differs from that of 500 codes in that 555 represents the office code (NXX) and remains a constant. The numbers being assigned are the line numbers-- the last four digits of a seven-digit number telephone number. A 555 line number that has been in use many years is 555-1212, which is used for directory assistance. This particular 555 number will continue to be used for that purpose. Non-communications companies as well as communications companies can obtain line number assignments for 555 line numbers. Like the telephone number for directory assistance, these numbers are to be used for informational purposes.

The 555 line numbers are being assigned on a national or regional basis. A national 555 number is assigned to an entity for use in most or all of the area codes in the United States, whereas a regional 555 number is assigned to an entity for use in a specific geographic area (less than 30% of the area codes or states or provinces).10 Thus, a regional 555 number may be assigned to more than one entity if it is to be used in different geographic regions. A national number cannot be assigned to more than one entity.

Table 10 is a "balance sheet" containing information on the assignment of 555 line numbers. Table 11 tracks the assignment of 555 line numbers. The first 555 line numbers were assigned on May 12, 1994. As of March 31, 1997, 2,535 line numbers (i.e. 555-XXXX) had been assigned. Tables 12 and 13 show the assignment of telephone numbers with 555 as the first three digits.

800 and 888 Service

Toll-free 800 and 888 are services for which the called party pays for the call. Prior to 1993, toll-free 800 calls were routed in a manner similar to that being used for 500 and 900 calls, with the NXX office code indicating the long distance carrier handling the call. Information is available (in the same format and sequence as the tables displaying 900 codes) from the FCC indicating the status of the 800 market as of April 30, 1993; this is the last available data under the old 800 routing system.11

On May 1, 1993, procedures for routing 800 calls were changed. The first three digits of 800 calls no longer indicate the carrier handling the call. The new system enables customers to

10 In the Bellcore guidelines for 555 line numbers, the regional numbers are referred to as "non- national" numbers.

11 This data is available in the publication, Long Distance Carriers and Their Code Assignments, October 29, 1993, mimeo #40233.

5 change long distance carriers while still retaining the same 800 number. This system of "portability" relies on a large data base maintained by Database Service Management, Inc. (DSMI), which is a subsidiary of Bellcore. During the two years since 800 portability was implemented, the number of working 800 telephone numbers is reported to have tripled. The growth of 800 telephone numbers is shown in Table 14. This growth has caused the near exhaust of 800 numbers. In March 1996, the 888 code was added to support the increase in demand for toll-free numbers (codes were first assigned in February 1996). The 888 code has nearly 8 million combinations. Table 15 shows the growth of 888 telephone numbers starting in 1996.

900 Service

900 service is a service for which the calling party is charged for the call at rates different from those charged for ordinary long distance calls. A common use is the provision of information- type services such as sports scores, music industry updates, stock quotes, and weather forecasts. Some companies use 900 numbers for software support -- with callers, in effect, paying a per- minute consulting fee.

The provision of 900 service typically involves two parties: a carrier to handle the transmission and an entertainment or information provider. The information provider is not regulated by the FCC but is regulated by the Federal Trade Commission with respect to advertising, billing 900 services, and the message preamble. The carrier that transmits a 900 call usually handles the billing and collection as well. Because billing and collection is nonregulated, charges for this activity are usually covered by contract. The carrier typically charges both a per-minute fee for the actual transmission of the message plus a share of the gross receipts for handling the billing and collection.

The assignment of 900 codes is similar in many respects to the assignment and use of 500 codes discussed above. For example, the assignment of each NXX code represents 10,000 individual line numbers, and the codes are not transferable among carriers.

Tables 16 through 19 are almost identical in format to the tables presented earlier for 500 service. Table 16 is a "balance sheet" for the assignment of 900 numbers, indicating the number of codes assigned and the types of carriers to which the codes are assigned. Table 17 tracks the assignment of codes to potential competitors in the market for 900 services over time. Tables 18 and 19 provide a list of all assigned 900 codes and the firms holding those codes.

Not all of the 900 codes assigned by Bellcore are in use at any particular time. In some cases, a firm that has acquired a 900 code may not yet have commenced operation. In other cases, firms may have merged or terminated operations and the numbers have not yet been reassigned.

6

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This report is available in the Common Carrier Bureau reference room, 2000 M Street, N.W., Room 575, Washington, D.C. 20554. The data contained in this report can be obtained [file name LDC1Q97.ZIP] from the FCC-State Link internet site at http://www.fcc.gov/ccb/stats on the World Wide Web. The report can also be downloaded from the FCC-State Link computer bulletin board at (202) 418-0241. Copies of the report may be purchased by calling International Transcription Services, Inc. (ITS) at (202) 857-3800. For more information, contact Katie Rangos at (202) 418-0940.

7 TABLE 1 NUMBER OF CARRIER IDENTIFICATION CODES (CICS) ASSIGNED BY BELL COMMUNICATIONS RESEARCH 1982 - 1992

NUMBER OF NUMBER OF YEAR QUARTER CICS YEAR QUARTER CICS ASSIGNED ASSIGNED

1982 FIRST QUARTER 11 1988 FIRST QUARTER 602 SECOND QUARTER 13 SECOND QUARTER 621 THIRD QUARTER 13 THIRD QUARTER 601 FOURTH QUARTER 11 FOURTH QUARTER 639 1983 FIRST QUARTER 15 1989 FIRST QUARTER 685 SECOND QUARTER 25 SECOND QUARTER 714 THIRD QUARTER 33 THIRD QUARTER 730 FOURTH QUARTER 42 FOURTH QUARTER 747 1984 FIRST QUARTER 54 1990 FIRST QUARTER 774 SECOND QUARTER 86 * SECOND QUARTER 794 THIRD QUARTER 121 THIRD QUARTER 817 FOURTH QUARTER 155 FOURTH QUARTER 791 1985 FIRST QUARTER 182 1991 FIRST QUARTER 745 SECOND QUARTER 212 SECOND QUARTER 766 THIRD QUARTER 236 THIRD QUARTER 783 FOURTH QUARTER 256 FOURTH QUARTER 807 1986 FIRST QUARTER 276 1992 FIRST QUARTER 786 SECOND QUARTER 331 SECOND QUARTER 831 THIRD QUARTER 361 THIRD QUARTER 840 FOURTH QUARTER 413 FOURTH QUARTER 886 1987 FIRST QUARTER 444 SECOND QUARTER 495 THIRD QUARTER 530 FOURTH QUARTER 573

NUMBER OF CARRIER IDENTIFICATION CODES (CICS) ASSIGNED BY BELL COMMUNICATIONS RESEARCH 1993 - 1997

YEAR QUARTER FGB FGD

1993 FIRST QUARTER 694 ** 709 SECOND QUARTER 738 746 THIRD QUARTER 739 760 FOURTH QUARTER 753 796 1994 FIRST QUARTER 781 815 SECOND QUARTER 795 845 THIRD QUARTER 805 899*** FOURTH QUARTER 819 947 1995 FIRST QUARTER 829 1,016 SECOND QUARTER 832 1,082 THIRD QUARTER 843 1,146 FOURTH QUARTER 852 1,209 1996 FIRST QUARTER 865 1,253 SECOND QUARTER 876 1,300 THIRD QUARTER 875 1,315 FOURTH QUARTER 878 1,337 1997 FIRST QUARTER 882 1,395

* CONVERSION FROM 2-DIGIT CODES TO 3-DIGIT CODES. ** CONVERSION FROM 3-DIGIT CODES TO 4-DIGIT CODES. *** INCLUDES BOTH 3-DIGIT CODES AND 4-DIGIT CODES.

8 TABLE 2 LIST OF FGB CIC CODE ASSIGNMENTS SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0002 WORLDCOM, INC. 0322 AMERICAN SHARECOM, INC. 0004 ATX TELECOMMUNICATIONS SERVICES 0327 ECI COMMUNICATIONS 0005 MACY'S OF CALIFORNIA 0330 TEL-SHARE 0013 ACCESS SERVICES dba PACIFIC NW TELECOM 0338 MIDCO COMMUNICATIONS 0015 HAWAIIAN TELEPHONE COMPANY 0339 COMMUNICATION CABLE LAYING CO., INC. 0016 TMC LONG DISTANCE dba CHERRY COMMUNICATIONS, INC. 0340 TELECOMM. TECHNOLOGIES, INC. (TEL-TECH) 0017 NCHE TELECOMMUNICATIONS NETWORK, INC. 0349 COMMUNICATION CABLE LAYING CO., INC. 0019 TMC LONG DISTANCE dba CHERRY COMMUNICATIONS, INC. 0356 EASTMAN KODAK COMPANY 0025 INTER CONTINENTAL TELEPHONE 0357 MANITOWOC LONG DISTANCE SERVICE 0028 AMERICAN LONG DISTANCE CORPORATION 0358 LCI INTERNATIONAL TELECOM CORP. 0030 US LONG DISTANCE 0366 AMERICAN TELCO, INC. 0035 LONG DISTANCE AMERICA 0367 WORLDCOM, INC. 0045 PSA, INC. 0370 AMERICAN NETWORK EXCHANGE INC. 0048 ETSC 0373 ECONO-LINE WACO 0049 HEDGES & ASSOCIATES 0375 AT&T EASYLINK SERVICES 0056 SP TELECOM 0378 TEL SERV 0057 NATIONWIDE LONG DISTANCE, INC. 0380 TELESERV CORPORATION 0060 ECONOMY TELEPHONE, INC. 0384 VOICECOM SYSTEMS, INC. 0062 KENTUCKY TELEPHONE CORP. 0390 ONE-2-ONE COMMUNICATIONS 0065 ISACOMM, INC. [SPRINT] 0393 INTERMEDIA COMMUNICATIONS, INC. 0067 NATIONAL TELEPHONE COMMUNICATIONS, INC. 0396 U.S. TELE-COMM, INC. 0070 US LONG DISTANCE 0402 INTEGRETEL, INC. 0071 DIGITAL NETWORK, INC. 0409 TELEVOX PUBLIC COMMUNICATIONS, INC. 0074 VALU-LINE OF ANGLETON 0410 CALL AMERICA/PALM DESERT 0078 US LONG DISTANCE 0420 PHOENIX NETWORK 0080 WORLDCOM, INC. 0421 WORLDCOM, INC. 0083 TELCO 0441 ESCONDIDO TELEPHONE COMPANY 0085 WESTEL, INC. 0442 WORLDCOM, INC. 0086 FRONTIER COMMUNICATIONS OF THE MID ATLANTIC, INC. 0446 WORLDCOM, INC. 0089 HARBOR BAY TELECOMMUNICATIONS 0461 TTE OF CHARLESTON 0093 TCA COMMUNICATIONS 0462 TMC OF LEXINGTON 0110 TANDEM ACCESS FOR DATABASE QUERY 0469 GMW COMPANY 0136 EASTERN TELECOM INTERNATIONAL 0470 COSHOCTON L.D.S. 0139 ASCENDING TECHNOLOGIES 0475 FIBERFONE OF FLORIDA, INC. 0171 SUPERTEL COMMUNICATIONS, INC. 0480 STAT COMMUNICATIONS 0189 STATE OF TEXAS - GSC 0486 EXECULINES OF SACRAMENTO 0190 BCS COMMUNICATIONS 0487 CAMBRIDGE COMMUNICATIONS 0191 TELEPHONE SUPPORT SYSTEMS, INC. 0488 WORLDCOM, INC. 0197 FLEABUSTERS 0489 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 0200 US WATS 0490 PHOENIX COMMUNICATIONS GROUP, INC. 0202 EXECULINES OF THE NORTHWEST, INC. 0497 ECON-A-CALL INC. OF HAYS 0204 UNITED TELEPHONE LONG DISTANCE 0499 TELEPHONE ASSOC. dba THIEF RIVER FALLLS LD 0207 SHENANDOAH LONG DISTANCE COMPANY 0505 CENTURY TELECOMMUNICATIONS, INC. 0210 STARLINE, INC. 0511 EXECULINES OF SACRAMENTO 0211 FRONTIER COMMUNICATIONS INTERNATIONAL, INC. 0517 MONTANA LONG DISTANCE, INC. 0214 TCA COMMUNICATIONS 0519 MIDCOM, INC. 0218 KRISTIN ENTERPRISES dba TEL-CENTRAL 0521 ROANOKE & BOTETOURT TELEPHONE CO. 0220 TELECOM*USA [MCI] 0522 TELEFIND CORPORATION 0221 CAPITAL TELECOMMUNICATIONS, INC. 0527 INDEPENDENCE TELEPHONE CO. 0223 CABLE & WIRELESS COMMUNICATIONS, INC. (TDX) 0529 TELECOM WEST 0228 USLINK LONG DISTANCE 0535 WORLDCOM, INC. 0229 U S COMNET 0537 LCI INTERNATIONAL 0244 PHOENIX NETWORK 0542 UNITED STATES CELLULAR CORPORATION 0260 ADVANCED COMMUNICATIONS SYSTEMS INC. 0551 ACCESS-PLUS, INC. 0264 MIIC dba POLARIS TELCOM 0552 LAKE STATES COMMUNICATIONS 0266 COMSYSTEMS NETWORK SERVICES 0556 US LONG DISTANCE 0268 THE COMMUNIGROUP 0558 MIDCOM OF ARIZONA, INC. 0271 U.S. NETWORK 0561 LCT LONG DISTANCE 0272 BELL ATLANTIC COMMUNICATIONS, INC. 0566 CABLE & WIRELESS COMMUNICATIONS, INC. (TDX) 0275 SWIFF TRAIN COMMUNICATIONS 0572 PAC TEL PAGING, A PACIFIC TELESIS CO. 0277 FIRST CHOICE LONG DISTANCE, INC. 0578 TTI TELECOMMUNICATIONS, INC. 0282 ACTION TELCOM CO. 0579 ALIANT SYSTEMS, INC. 0289 VACATION VILLAGES OF AMERICA, INC. 0589 WORLDCOM, INC. 0297 PACIFIC GATEWAY EXCHANGE 0592 ESS VENTURES, INC. 0298 U.S. NET, INC. 0596 INTERNET, INC. 0300 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 0607 LONG DISTANCE COMMUNICATIONS 0302 AUSTIN BESTLINE 0608 MODULAR DATA, INC. 0306 COLORADO RIVER COMMUNICATIONS 0616 INTER COMM. MANAGEMENT NETWORK 0320 DIGITEL 0618 RSL COM U.S.A.

9 TABLE 2 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0624 MASTERCARD INTERNATIONAL 0870 BLUE RIDGE TELEPHONE 0627 NATIONWIDE EMERGENCY TELECOMM. SYSTEM 0872 SPRINT 0634 ECONO-LINE MIDLAND 0878 VALLEY STAR-TEL 0637 FOX COMMUNICATIONS CORP. 0879 US COMMUNICATIONS,INC. 0638 NORTHWEST TELECOM, LTD. 0883 WORLDCOM, INC. 0639 ARCADA COMMUNICATIONS 0884 WORLDCOM, INC. 0642 R,D,&J COMMUNICATIONS MGMT., INC. 0885 THE COMMUNIGROUP OF KC 0652 BELL ATLANTIC COMMUNICATIONS, INC. 0886 ALIANT SYSTEMS, INC. 0654 CINCINNATI BELL LONG DISTANCE 0887 TELEMANAGEMENT CONSULTANTS CORPORATION 0657 NATIONAL TELECOM. OF FLORIDA 0888 MCI 0658 OCI 0899 TELEPHONE EXPRESS 0661 COASTAL TELEPHONE COMPANY 0905 PIZZA HUT, INC. 0663 AMERICAN TELCO NETWORK SERVICES INC. 0908 NTC, INC. 0664 INTERMOUNTAIN DIGITAL NETWORK 0909 CHADWICK TELEPHONE 0669 VALU-LINE OF AMARILLO 0912 MRC TELECOMMUNICATIONS, INC. 0675 COMMUNICATION SERVICES OF COLORADO 0913 ATS COMMUNICATIONS, INC. 0679 FEIST LONG DISTANCE 0914 CENTURY TELECOMMUNICATIONS, INC. 0684 LCT LONG DISTANCE 0922 FEB CORPORATION 0687 NTS COMMUNICATIONS, INC. 0927 ADVANCED RADIO COMMUNICATIONS SYSTEMS 0693 DELUXE DATA SYSTEMS 0929 STENOCALL 0695 OPTICALL COMMUNICATIONS SERVICES 0931 L.D. NETWORK, INC. 0698 NYNEX 0937 ACCESS LONG DISTANCE 0699 TEL-COM, INC. 0945 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 0700 TEL AMERICA 0950 BENEFICIAL DATA PROCESSING CORP. 0705 EXECULINES OF THE NORTHWEST, INC. 0951 WORLDCOM, INC. 0709 TEL AMERICA 0952 WILKES LONG DISTANCE SERVICE 0714 PHONELINK, INC. 0956 BANK OF AMERICA, NT & SA 0727 SWITCH 2000, INC. 0959 AMRIGON ENTERPRISES, INC. 0733 WORLDCOM, INC. 0961 TELEPHONE SYSTEMS OF GEORGIA 0737 WORLDCOM, INC. 0965 HOGAN COMMUNICATIONS 0738 WORLDCOM, INC. 0966 COASTAL AUTOMATED COMMUNICATIONS CORP. 0740 PUBLIC SWITCH CORP. 0985 FONOROLA 0741 WORLDCOM, INC. 0987 WORLDCOM, INC. 0742 WORLDCOM, INC. 0988 AT&T EASYLINK SERVICES 0746 NATIONAL TELEPHONE EXCHANGE (PA) 0989 KRB TELECOM 0752 EXCEL TELECOMMUNICATIONS, INC. 0990 VISA USA INC. 0756 US LONG DISTANCE 0996 MIDCO COMMUNICATIONS 0757 PACE LONG DISTANCE SERVICE 1001 WORLDCOM, INC. 0759 TELENET COMM. CORP., (SPRINT) 1003 FRONTIER COMMUNICATIONS INTERNATIONAL, INC. 0760 GTE TELECOM 1006 WORLDCOM, INC. 0761 MELLON BANK N.A. 1007 TELAMARKETING COMMUNICATIONS, INC. 0762 STATE OF CALIFORNIA - CALNET 1008 WORLDCOM, INC. 0765 NETWORK LONG DISTANCE 1009 TWT-HEARTLINE 0766 YAVAPAI TELEPHONE EXCHANGE 1010 FLEX COMMUNICATIONS SYSTEM 0770 VISA USA INC. 1011 WORLDCOM, INC. 0773 AMERICAN L.D. OPERATOR SERVICE CO. 1012 LITEL/LCI INTERNATIONAL 0774 CITYNET COMMUNICATIONS, INC. 1014 MARATHON COMMUNICATIONS 0777 SPRINT 1018 SHARED USE NETWORK 0787 STAR TEL OF ABILENE 1021 WORLDCOM, INC. 0788 C-COM 1022 MCI 0789 WORLDCOM, INC. 1026 NET-TEL CORPORATION 0794 AMERITEL 1027 WORLDCOM, INC. 0800 WORLDCOM, INC. 1031 WORLDCOM, INC. 0805 OCI 1033 SPRINT 0806 NACT 1036 LONG DISTANCE SAVERS 0823 UNITED BANK OF DENVER 1037 BN1 TELECOMMUNICATIONS, INC. 0825 FIBERLINE NETWORK COMMUNICATIONS L.P. 1039 AMERISYSTEMS, INC. 0829 TELEPHONE ASSOC. LONG DISTANCE SVCS. 1040 U.S. SIGNAL CORPORATION 0832 TELECOM*USA [MCI] 1042 WORLDCOM, INC. 0835 TELECOM*USA [MCI] 1044 ALLNET COMM. SVC. INC. [LDX,LEXITEL] 0837 TELEPHONE ASSOC. LONG DISTANCE SVCS. 1046 CAM-NET, INC. 0839 CABLE & WIRELESS COMMUNICATIONS, INC. (TDX) 1050 WORLDCOM, INC. 0843 WORLDCOM, INC. 1052 WEST COAST TELECOMMUNICATIONS, INC. 0853 DIGITAL NETWORK, INC. 1053 WORLDCOM, INC. 0855 UNION TELEPHONE COMPANY 1054 EASTERN TELEPHONE SYSTEMS, INC. 0859 VALU-LINE OF LOUISIANA, INC. 1055 WORLDCOM, INC. 0861 NATIONAL PAYPHONE SUPPLY dba RATE SAVER 1058 FRONTIER COMMUNICATIONS OF THE GREAT LAKES, INC. 0867 BITTEL TELECOMMUNICATIONS CORP. 1061 AMERICAN COMMUNICATIONS NETWORK 0868 WORLDCOM, INC. 1064 DNS, INC.

10 TABLE 2 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 1066 ALLNET [LEXITEL/LDX] 1274 WORLDCOM, INC. 1069 WILLAMETTE VALLEY TELCOM SERVICES 1279 ASSOCIATED TELENET INC./ A CTI COMPANY 1072 NBD BANK, NA 1281 BUYPASS CORPORATION 1073 COMMUNICATIONS OPTIONS, INC. 1283 IOWA COMMUNICATIONS NETWORK 1075 ALLCOMM LONG DISTANCE, INC. 1285 CHECKRITE 1076 INTERNATIONAL TELEMEDIA ASSOCIATES, INC. 1286 CINCINNATI BELL LONG DISTANCE 1077 GENERAL COMMUNICATION, INC. 1287 CALIFORNIA STATE LOTTERY 1082 WORLDCOM, INC. 1288 AT&T COMMUNICATIONS 1084 WORLDCOM, INC. 1290 WORLDCOM, INC. 1087 TELECOM*USA [MCI] 1291 CALL SAVERS, INC. 1088 SBS/MCI 1292 CARD ESTABLISHMENT SERVICES 1091 CALL TECHNOLOGY CORP. OF PHILADELPHIA 1293 CINCINNATI BELL LONG DISTANCE 1092 TELECOM*USA [MCI] 1295 GLENS FALLS LONG DISTANCE SERVICE 1094 MAG CARD 1296 TELNEX, INC. 1096 FLEX COMMUNICATIONS SYSTEM 1299 LECNET 1097 TRESCOM PUERTO RICO 1305 MOTOROLA INC. 1098 NETECH COMM., A US WEST COMPANY 1311 WORLDCOM, INC. 1099 PAC-WEST TELECOMM, INC. dba AMERICALL 1312 WORLDCOM, INC. 1120 TRT TELECOMMUNICATIONS CORPORATION 1313 STAR TEL, INC. 1122 MCI 1314 AT&T WIRELESS SERVICES, INC. 1125 ATLANTIC TELEPHONE COMPANY, INC. 1315 WORLDCOM, INC. 1133 MCI 1318 LONG DISTANCE SAVERS 1141 IFC COMMUNICATIONS 1319 CONQUEST 1148 ALLEGAN CELLULAR L.P. 1321 TELECOM*USA [MCI] 1149 TELEPHONE TOWNHALL MEETINGS, INC. 1324 FIRST COMMUNICATIONS, INC. (FDR) 1177 SPRINT 1325 ECONO CALL LONG DISTANCE SERVICES 1178 TEAM ELECTRONICS 1326 DIAL AMERICA, INC. 1183 MCI 1331 TEXUSTEL, INC. 1188 MCI 1332 NORTHLAND TELEPHONE SYSTEMS LTD. 1195 GASCARD 1333 SPRINT 1203 CYPRESS TELECOMMUNICATIONS CORP. (CYTEL) 1335 TOUCH AMERICA, INC. 1206 FIRST OF AMERICA BANK SE MICHIGAN N.A. 1336 COMMONWEALTH LONG DISTANCE CO. 1208 WORLDCOM, INC. 1337 FIRST DATA RESOURCES, INC. (FST) 1212 WORLDCOM, INC. 1341 NATIONAL TELE-SAV, INC. 1213 LONG DISTANCE TELEPHONE SAVERS 1342 EQUITABLE GAS 1215 STAR TEL OF ABILENE 1344 CALL AMERICA BUSINESS COMM. CORP. 1216 PENNY FONE 1345 ACC LONG DISTANCE CORPORATION 1217 WORLDCOM, INC. 1348 VALU-LINE OF TRI-CITIES 1219 CALL USA CORP. 1350 DIAL-NET, INC. 1222 MCI 1351 CALL AMERICA OF RIVERSIDE 1224 TELECOM*USA [MCI] 1352 STANDARD TELCOM, INC. 1225 IOWA NETWORK SERVICES, INC. 1353 WORLDCOM, INC. 1226 ONE CALL COMMUNICATIONS 1355 US LINK LONG DISTANCE 1227 PEOPLES TELEPHONE COMPANY, INC. 1359 OFF CAMPUS COMMUNICATIONS 1231 AMERICAN SHARECOM, INC. 1360 TOUCH AMERICA, INC. 1232 FRONTIER COMMUNICATIONS OF THE GREAT LAKES, INC. 1361 DAKOTA COOPERATIVE TELECOMM., INC. 1233 DELTACOM LONG DISTANCE SERVICES 1362 AMERISYSTEMS, INC. 1234 ACC LONG DISTANCE CORPORATION 1363 TEL-TOLL dba ECON-O-DIAL OF BISHOP 1235 AUTOMATED TELEPHONE 1372 WORLDCOM, INC. 1236 LITEL/LCI INTERNATIONAL 1377 FONES WEST DIGITAL SYSTEMS 1237 WORLDCOM, INC. 1379 MSI COMMUNICATIONS, INC. 1239 CONSOLIDATED COMMUNICATIONS CORPORATION 1382 LONG DISTANCE MANAGEMENT, INC. 1240 DELTACOM, INC. 1383 CARIBBEAN TELEPHONE & TELEGRAPH, INC. 1241 AMERICAN LONG LINES 1385 THE SWITCHBOARD 1243 BEEHIVE TELEPHONE CO., INC. 1391 OMNICALL COMMUNICATIONS CORPORATION 1245 TACONIC LONG DISTANCE SERVICE, CORP. 1392 MOBIL OIL CREDIT CORP. 1246 WORLDCOM, INC. 1394 TRESCOM U.S.A., INC./TRESCOM CARIBBEAN 1249 PSP MARKETING GROUP, INC. 1399 CENTRAL NEW YORK TALK-TRANSIT 1250 DIAL-NET, INC. 1400 AMERICAN SHARECOM, INC. 1251 AMERICAN INT'L. TELECOMMUNICATIONS 1401 NATIONAL TELESERVICE 1252 LONG DISTANCE/USA [SPRINT] 1406 WORLDCOM, INC. 1253 LITEL/LCI INTERNATIONAL 1407 WORLDCOM, INC. 1254 WORLDCOM, INC. 1408 WORLDCOM, INC. 1257 CONQUEST 1411 AMERICAN EXPRESS TRAVEL RELATED SVCS. 1261 PAC-WEST TELECOMM, INC. dba AMERICALL 1412 PENN TELECOM, INC. 1262 PAC-WEST TELECOMM, INC. dba AMERICALL 1419 ASSOCIATED GROCERS, INC. 1267 WORLDCOM, INC. 1425 CAPITAL NETWORK SYSTEMS INC. 1268 THE COMMUNIGROUP OF KC 1426 IBM 1273 EDS 1429 EXTELCOM dba EXPRESS TEL

11 TABLE 2 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 1430 DOMINO'S PIZZA INC. 1583 GST NET, INC. 1431 WESTERN TELENET, INC. 1586 DIGITAL NETWORK, INC. 1432 LCI INTERNATIONAL 1587 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 1434 GENERAL ELECTRIC INFORMATION SERVICES 1591 SANTA FE RAILWAY 1435 EXTELCOM dba EXPRESS TEL 1595 VARTEC TELECOM, INC. 1436 ALARM CENTER, INC. 1598 TRANSACTION NETWORK SERVICES, INC. 1437 AMERICAN NATIONAL TELCOM 1599 TEXAS LONG DISTANCE CONROE 1439 STAR TEL, INC. 1600 TELEVALUE CORP. dba ECON-O-DIAL RIDGECREST 1440 MFS INTELENET, INC. 1601 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 1443 WESTERN OKLAHOMA INFORMATION SYSTEMS 1602 COMLINK USA 1444 ALLNET COMM. SVC. INC. [LDX,LEXITEL] 1604 SB COMMUNICATIONS, INC. 1447 FAXNET CORPORATION 1611 COMCENTRAL, INC. 1450 WORLDCOM, INC. 1613 AN-SER SERVICES (FROMM SERVICES, INC.) 1451 LCI INTERNATIONAL 1614 CINCINNATI BELL LONG DISTANCE 1452 LCI INTERNATIONAL 1615 C.P.I. dba GULF STATES COMMUNICATIONS 1453 WORLDCOM, INC. 1619 COLORADO RIVER COMMUNICATIONS 1456 WORLDCOM, INC. 1620 TELEMONEY SERVICES, A FIRST DATA CORPORATION 1457 TRACE COMMUNICATIONS 1621 MID TNC dba MIDCOM COMMUNICATIONS, INC. 1459 WESTCOM LONG DISTANCE 1622 MEDE AMERICA 1460 INDEPENDENT NETWORK SERVICES 1623 NATIONAL TELESERVICE 1463 INTELENET COMMISSION 1628 LDDS 1464 WORLDCOM, INC. 1629 COACHELLA VALLEY COMM., dba INTEG. OPER. SVCS. 1465 INTELCO 1631 LONG DISTANCE OF MICHIGAN 1468 ITC NETWORKS OF UTAH 1632 NATIONAL DATA CORPORATION 1472 FIRST CHOICE LONG DISTANCE, INC. 1633 EXECULINES OF SACRAMENTO, INC. 1476 TELECOMPUTE CORPORATION 1635 METRO TELEPHONE INC. 1477 POPP TELECOM 1641 SOURIS RIVER TELECOMMUNICATIONS COMPANY 1478 ITC NETWORKS OF UTAH 1644 OHIO DEPARTMENT OF ADMINISTRATIVE SVCS. 1482 TELE-SYS, INC. 1645 AMERICAN COMMUNICATIONS TECHNOLOGY, INC. 1483 INDEPENDENT LONG DISTANCE 1646 CONTACT AMERICA, INC. 1484 COMMUNITY LONG DISTANCE INC. 1648 MID MCND dba MIDCOM COMMUNICATIONS, INC. 1485 TELTRUST, INC. 1651 O.L.C. COMPANY 1491 NORTHERN ARIZONA COMMUNICATIONS CORP. 1655 MERCHANT-LINK, INC. 1492 CARD ESTABLISHMENT SERVICES 1661 COASTAL TELEPHONE CO. 1493 EXTELCOM dba EXPRESS TEL 1662 RESOURCE TECHNOLOGY 1494 EXTELCOM dba EXPRESS TEL 1666 SYSTEMS 1000 1500 FRONTIER COMMUNICATIONS OF THE GREAT LAKES, INC. 1667 COMMUNICATIONS INC., dba ECI 1502 COMMUNICATION TELESYSTEMS INTL. (CTS) 1670 CAMERON LONG DISTANCE 1506 ADP AUTONET 1673 TELEPHONE CONNECTIONS, INC. 1507 LEE HARBOR HOMES 1674 MSI COMMUNICATIONS, INC. 1510 INNOVATIVE COMMUNICATIONS, INC. 1676 PUGET SOUND BANK 1514 ANNE ARUNDEL COUNTY 1678 VALU-LINE OF KANSAS, INC. 1515 FRONTIER COMMUNICATIONS OF NEW ENGLAND, INC. 1680 MIDWEST TELEPHONE SERVICE, INC. 1518 TELECON COMMUNICATIONS CORPORATION 1682 STATE OF MARYLAND (DEPT OF GEN.SERVICES) 1520 TEL-SPAN COMMUNICATIONS, INC. 1685 INTL.800 TELECOM dba TELECALL LONG DIST. 1522 TELAPEX LONG DISTANCE, INC. 1686 AT&T CANADA LONG DISTANCE SERVICES CO. 1532 WORLDCOM, INC. 1689 TELEMANAGEMENT CONSULTANTS CORPORATION 1533 LONG DISTANCE DISCOUNT, INC. 1690 CORPORATE TELEMANAGEMENT GROUP 1536 LONG DISTANCE MANAGEMENT 1692 CARD ESTABLISHMENT SERVICES 1539 ALLNET [LEXITEL/LDX] 1694 FRONTIER LONG DISTANCE AMERICA 1544 UNITED TELEPHONE CO. dba TELAMERICA L.D. 1696 JC PENNEY BUSINESS SERVICES 1545 KEYSTONE TELECOM, INC. 1701 WESTERN TELECOMMUNICATION, INC. (WTCI) 1546 WORLDCOM, INC. 1703 KEYSTONE TELECOMMUNICATIONS INC. 1547 TELEFONICA LARGA DISTANCIA DE P.R., INC. 1704 ARTHUR ANDERSON & CO. 1549 NATIONAL BRANDS, INC. 1706 ICON COMMUNICATIONS CORPORATION 1550 CENTURY LONG DISTANCE 1707 TELVUE CORPORATION 1554 CELLTOLL CORPORATION 1708 LIGHT LINK, INC. dba TAYLOR COMM. GRP. 1555 WORLDCOM, INC. 1712 WCS OPERATORS 1560 TCI COMMUNICATIONS, INC. . 1716 COMPUSERVE 1562 LCI 1717 PASS WORD, INC. 1563 LINKUSA CORPORATION 1718 TCG 1564 LONG DISTANCE OHIO, INC. 1720 SILVERADO COMMUNICATIONS 1565 METRO ONE DIRECT 1722 HI-PLAINS NTS COMMUNICATIONS 1567 ADVANCED MKG. SVCS., dba DIAL ANYWHERE 1724 WORLDCOM, INC. 1568 US COMM. INC, dba SOUTHWEST L.D.N, INC. 1725 CONSOLIDATED NETWORK, INC. 1569 WEST COAST TELECOMMUNICATIONS, INC. 1728 GARDEN STATE LONG DISTANCE TELEPHONE 1573 AMERICAN TELECOMMUNICATIONS HOLDING LTD. 1729 TEL AMERICA 1581 NORCOMM 1731 TELESCAN, INC. 1582 NORCOMM 1732 AT&T COMMUNICATIONS

12 TABLE 2 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 1739 FLAT RATE COMMUNICATIONS 1932 MID-TEL L.D. OF MINOT 1745 TELEPHONE ELECTRONICS NETWORK, LTD. 1933 NORTH AMERICAN COMMUNICATIONS, INC. 1750 VC TELECOMMUNICATION SYSTEMS 1935 FIRST CHOICE LONG DISTANCE, INC. 1754 ADVANTIS 1939 VISTA-UNITED TELECOMMUNICATIONS 1755 ADVANTIS 1941 DATA COM 1764 ROANOKE TELEPHONE COMPANY 1944 WYNN-HILL NETWORK 1768 DIGINET COMMUNICATIONS 1946 WESTINGHOUSE COMMUNICATIONS 1769 STATE OF NEW YORK 1947 ITI INCORPORATED 1771 TELECOM*USA [MCI] 1955 UNITED COMMUNICATIONS, INC. 1772 ADVANTIS 1957 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 1779 PEOPLES PHONE COMPANY 1962 GULF LONG DISTANCE, INC. 1780 MATRIX TELECOM 1963 CAPITAL TELECOMMUNICATIONS, INC. 1783 VERTELCO SYSTEMS 1964 AMERITEL LONG DISTANCE FOR LESS 1784 SUNTEL NETWORK, INC. 1972 DIGITAL NETWORK, INC. 1786 WORLDCOM, INC. 1973 TEL-A-SAVE COMMUNICATIONS SYSTEMS, LTD. 1791 INFOCOM INTERNATIONAL, INC. 1975 VARTEC NATIONAL, INC. 1793 RESPONSE TELCOM, L.P. 1977 TELEPHONE COMMUNICATIONS CORPORATION 1798 THE PAY TELEPHONE COMPANY 1978 NETWORK BILLING & COLLECTION, INC. (NBC) 1799 SYMTECH COMMUNICATIONS SERVICES 1979 VORTEL COMMUNICATIONS, INC. 1801 WORLDCOM, INC. 1980 MIDWEST TELECOM 1802 ELECTRIC LIGHTWAVE, INC. 1982 WESTERN TELECOMMUNICATION, INC. (WTCI) 1807 SOUTH CAROLINA NETWORK, INC. 1983 STAR TEL OF VICTORIA, INC. 1808 EASTERN TELECOM GROUP 1984 STAR TEL TRANSMISSION CO., INC. 1809 ENVOY 1986 MCI 1811 VARTEC TELECOM, INC. 1991 ACCESS LONG DISTANCE 1812 SOUTHLAND CABLEVISION 1992 A.B.E. OF ALABAMA, INC. dba ECONOLINE 1816 MID-TEL L.D,. INC. OF WILLISTON 1993 SOUTHWEST UNITED COMMUNICATION, INC. 1819 HUB DISTRIBUTING, INC. 1994 TOUCH AMERICA, INC. 1820 BIZTEL LTD. 1997 GAS COMPANY OF NEW MEXICO 1821 BT NORTH AMERICA, INC. 1998 THE COMMUNIGROUP OF KC 1822 PROFESSIONAL NETWORKS MANAGEMENT, INC. 1999 WORLDCOM, INC. 1826 MCI 5008 US ONE COMMUNICATIONS CORP. 1827 TCS NETWORK SERVICES 5010 PHOENIX NETWORK 1828 TENCOM 5011 PHOENIX NETWORK 1830 PUBLIC SERVICE COMPANY OF NM 5012 ARRIVA COMMUNICATIONS, INC. 1831 EXECULINES OF SACRAMENTO 5013 LANSER TELECOM, INC. 1833 BUSINESS TELECOM, INC. 5025 AMERITECH 1836 GENERAL SERVICES ADMINISTRATION 5031 ARC NETWORKS 1841 FIRST FINANCIAL MANAGEMENT CORP. 5032 VALULINE LONG DISTANCE 1846 WORLDCOM, INC. 5035 COUNTY OF MONTGOMERY COMMUNICATIONS DIV. 1848 TRESCOM U.S.A, INC. 5036 MERCHANT-LINK, INC. 1850 DIGITEL 5037 MERCHANT-LINK, INC. 1852 TELECOM*USA [MCI] 5038 MERCHANT LINK, INC. 1857 TELECOM*USA [MCI] 5039 MERCHANT LINK, INC. 1858 AT&T CANADA LONG DISTANCE SERVICES CO. 5047 NYNEX 1860 METRO TELECOMM.SVCS., INC. dba METROCOMM 5048 NYNEX 1862 WORLDCOM, INC. 5050 AMERITECH SERVICES 1864 TRANSNET 5051 ARKANSAS BLUE CROSS BLUE SHIELD 1865 EXPRESS COMMUNICATIONS, INC. 5052 ARKANSAS BLUE CROSS BLUE SHIELD 1869 AT&T CANADA LONG DISTANCE SERVICES CO. 5054 USTEL 1871 LOYD COMM. dba COMTEL/HOT SPRINGS 5061 BELLSOUTH BUSINESS SYSTEMS 1873 ONE STAR LONG DISTANCE 5062 BELLSOUTH BUSINESS SYSTEMS 1874 WORLDCOM, INC. 5063 BELLSOUTH BUSINESS SYSTEMS 1875 U.S. ORDER 5064 INTERNET, INC. 1876 TELECOM*USA [MCI] 5065 INTERNET, INC. 1880 ONE CALL COMMUNICATIONS 5067 RCX, INC. 1881 COASTAL TELEPHONE COMPANY 5068 APPLIED SIGNAL CORPORATION 1882 TUCK DATA COMMUNICATIONS 5070 SALT LAKE TEL-A-SYS. C/O THE TANNER GRP. 1890 NORTH COUNTY COMMUNICATIONS CORP. 5071 SALT LAKE TEL-A-SYS. C/O THE TANNER GRP. 1891 OPERATOR SERVICE COMPANY 5075 ROCKEFELLER GROUP TELECOMM. SVCS. 1895 WORLDCOM, INC. 5079 JC PENNEY BUSINESS SERVICES 1897 ITC NETWORKS OF UTAH 5082 UNITED TELEMANAGEMENT SERVICES, INC. 1898 SBS/MCI 5083 ENVOY CORPORATION 1900 TELECOM*USA [MCI] 5085 UNITED REFINING COMPANY 1902 COAST TO COAST TELECOMMUNICATIONS 5089 ENVOY CORPORATION 1910 WORLDCOM, INC. 5098 B.P. OIL COMPANY 1915 TELE TECH, INC. 5101 WESTINGHOUSE COMMUNICATIONS 1918 WORLDCOM, INC. 5102 WESTINGHOUSE COMMUNICATIONS 1919 TEL NET INC. 5103 TELEPHONE BILLING SERVICE 1921 WORLDCOM, INC. 5104 AAA TELEPHONE & COMMUNICATIONS INC. 1930 PILGRIM TELEPHONE INC. 5105 PUBLIC SERVICE COMPANY OF NM

13 TABLE 2 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 5106 NEW YORK LOTTERY 5413 ROCKY MTN. HOSP dba BLUE CROSS OF CO 5110 NYNEX 5419 H.G. TELECOM, INC. 5111 FIBERNET TELEMANAGEMENT, INC. 5424 INTELLICALL 5113 STATE OF CAL. HEALTH AND WELFARE AGENCY DATA CENTER 5432 EXCEL TELECOMMUNICATIONS, INC. 5115 BROOKS FIBER COMMUNICATIONS 5438 LERMER OVERSEAS TELECOMMUNICATIONS, INC. 5119 NEXTLINK 5446 OHIO DEPARTMENT OF ADMINISTRATIVE SVCS. 5121 ONE-2-ONE COMMUNICATIONS 5454 QUESTAR INFOCOMM INCORPORATED 5123 U S WEST COMMUNICATIONS 5465 FEDERAL TRANSTEL, INC 5128 TMC WORLDWIDE, INC. 5468 MARYLAND STATE GOVERNMENT 5131 PACIFIC TELECOM, INC. (PTI) 5475 FIRSTEL 5136 COASTAL LONG DISTANCE SERVICES, INC. 5477 CITILINK OF UT, L.L.C. 5151 CELLULAR ONE WASHINGTON/BALTIMORE 5478 BELLSOUTH TELECOMMUNICATIONS 5163 AMERICAN NORTEL COMM. INC. 5483 IT&E OVERSEAS, INC. 5171 BUYPASS CORPORATION 5484 HORIZON TELECOMMUNICATIONS, INC. 5173 FIRST DATA RESOURCES, INC. (FST) 5500 ESS VENTURES, INC. 5174 SOUTHEAST SWITCH 5507 FONOROLA 5175 GROCERS SUPPLY COMPANY, INC. 5511 IT&E OVERSEAS, INC. 5180 FIRST NATIONAL BANK OF MARYLAND 5522 IT&E OVERSEAS, INC. 5181 FIRST NATIONAL BANK OF MARYLAND 5523 VALUE TEL 5182 FIRST NATIONAL BANK OF MARYLAND 5526 POKA LAMBRO TELECOMMUNICATIONS, INC. 5183 FIRST NATIONAL BANK OF MARYLAND 5535 LAKEDALE LINK, INC. 5184 FIRST NATIONAL BANK OF MARYLAND 5545 FIRST FINANCIAL MANAGEMENT CORP. 5185 USA PAGING 5547 TELEFONICA LARGA DISTANCIA DE P.R., INC. 5186 GLENS FALLS HOSPITAL 5555 AMERITECH SERVICES 5190 RETAIL DATA NETWORKS (RDN) 5556 BAY SPRINGS LONG DISTANCE 5191 RETAIL DATA NETWORKS (RDN) 5557 DAKOTA TELECOM, INC. (DTI) 5192 RETAIL DATA NETWORKS (RDN) 5559 COOPERATIVE COMMUNICATIONS, INC. 5193 RETAIL DATA NETWORKS (RDN) 5560 MELLON BANK N.A. 5194 RETAIL DATA NETWORKS (RDN) 5566 IT&E OVERSEAS, INC. 5201 WESTINGHOUSE COMMUNICATIONS 5577 NETWORK CARRIER SERVICES 5202 WESTINGHOUSE COMMUNICATIONS 5587 MELLON BANK N.A. 5210 NYNEX 5588 IT&E OVERSEAS, INC. 5213 TEXACO REFINING AND MARKETING, INC. 5599 INTELCOM GROUP (USA), INC. 5222 FIRST FINANCIAL MANAGEMENT CORP. 5600 ESCONDIDO TELEPHONE COMPANY 5224 ADVANTAGE COMMUNICATIONS GROUP, INC. 5601 MISSOURI LOTTERY 5225 TRANSACTION NETWORK SERVICES, INC. 5607 ONE-2-ONE COMMUNICATIONS 5226 SUPERTEL COMMUNICATIONS, INC. 5608 THE LONG DISTANCE PARTNERSHIP, L.P. 5227 SUPERTEL COMMUNICATIONS, INC. 5609 WHATCOM TELECOMM 5228 SUPERTEL COMMUNICATIONS, INC. 5610 LMG TEL, INC 5229 SUPERTEL COMMUNICATIONS, INC. 5611 PNG TELECOMMUNICATIONS 5236 MELLON BANK N.A. 5615 CAM-NET COMMUNICATIONS NETWORK, INC. 5237 COMPUSERVE 5620 TELEHOP COMMUNICATIONS. INC. 5238 COMPUSERVE 5623 FEDERAL TRANSTEL, INC 5239 COMPUSERVE 5624 MASTERCARD INTERNATIONAL 5240 COMPUSERVE 5626 TEL-ONE 5247 MASTERCARD INTERNATIONAL 5627 OHIO DEPARTMENT OF ADMINISTRATIVE SVCS. 5252 COLORADO CITY LINK 5630 TELEGROUP 5254 FIRST USA 5648 VMA, INC. dba UNIVERSITY TELEPHONE SERVICES, INC. 5267 CMS COMMUNICATIONS 5653 SPECIALIZED TELECOMMUNICATIONS 5268 VALU-LINE LONG DISTANCE 5654 MASTERCARD INTERNATIONAL 5269 COX COMMUNICATIONS, INC. 5656 CELLULAR ONE WASHINGTON/BALTIMORE 5276 BELLSOUTH TELECOMMUNICATIONS 5666 FIRST FINANCIAL MANAGEMENT CORP. 5282 CELLULAR ONE WASHINGTON/BALTIMORE 5677 WATS/800 INC. 5283 XPEDITE SYSTEMS, INC. 5678 AMERITECH SERVICES 5285 THE OHIO STATE UNIVERSITY 5679 NORTH PITTSBURGH TELEPHONE COMPANY 5293 HORIZON CELLULAR TELCO 5682 METROTIME COMMUNICATIONS 5299 CONNECTNET 5693 DELUXE DATA SYSTEMS 5300 AT&T BELL LABORATORIES 5698 MELLON BANK N.A. 5315 FIRST HAWAIIAN BANK 5700 PHOENIX NETWORK 5323 CHARITON VALLEY LONG DISTANCE CORPORATION 5708 ARTHUR ANDERSON & CO. 5325 STATE OF CAL. HEALTH AND WELFARE AGENCY DATA CENTER 5717 NETWORK ONE, INC. 5326 STATE OF CAL. HEALTH AND WELFARE AGENCY DATA CENTER 5721 VOICE TECHNOLOGY CORPORATION 5327 IEC COMMUNICATIONS, INC. 5735 FTI COMMUNICATIONS 5340 DELUXE DATA SYSTEMS 5747 MINNESOTA STATE RELAY - TRIAD BOARD 5347 MASTERCARD INTERNATIONAL 5750 CORESTATES FINANCIAL CORP 5353 US AIR 5751 CORESTATES FINANCIAL CORP 5359 DELUXE DATA SYSTEMS 5752 CORESTATES FINANCIAL CORP 5365 EMI COMMUNICATIONS CORP. 5754 ADVANTIS 5368 BUDGET CALL LONG DISTANCE 5757 CELLULAR ONE WASHINGTON/BALTIMORE 5377 SINCLAIR OIL CORP 5759 VALULINE LONG DISTANCE 5379 E-SCRIPT L.L.C. 5766 ETSC 5390 ONE-2-ONE COMMUNICATIONS 5768 BRINDLEE MOUNTAIN TELEPHONE COMPANY 5391 FIFTH THIRD BANK 5769 REAL CONNECT 5395 HARMONIC SYSTEMS INCORPORATED 5772 ADVANTIS 5396 HARMONIC SYSTEMS INCORPORATED 5775 BMG 5397 HARMONIC SYSTEMS INCORPORATED 5777 FEDERAL TRANSTEL, INC 5398 HARMONIC SYSTEMS INCORPORATED 5778 ARCO PAYPOINT 5399 HARMONIC SYSTEMS INCORPORATED 5783 ARTHUR ANDERSON & CO.

14 TABLE 2 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO 5795 CAPROCK COMMUNICATIONS 5800 ENVOY CORPORATION 5801 AVIRNEX COMMUNICATIONS GROUP 5813 VALU-LINE OF LOUISIANA, INC. 5819 CABLEVISION LIGHTPATH, INC. 5825 TRANSACTION NETWORK SERVICES, INC. 5829 TRANSACTION NETWORK SERVICES, INC. 5832 CROSSCHECK 5834 CTS TELCOM OF FLORIDA 5836 BRANSON TELEPHONE 5842 US WEST INTERPRISE AMERICA, INC. 5854 ONEIDA COUNTY TELEPHONE LONG DISTANCE 5858 CELLULAR ONE WASHINGTON/BALTIMORE 5867 EQUAL ACCESS OF WASHINGTON 5874 US COMMUNICATIONS,INC. 5875 U.S. COMMUNICATIONS, INC. 5876 U.S. COMMUNICATIONS, INC. 5877 U.S. COMMUNICATIONS, INC. 5879 TRANSACTION NETWORK SERVICES, INC. 5882 THE TELEPHONE CONNECTION OF L.A., INC. 5885 VIATEL, INC. 5888 FIRST FINANCIAL MANAGEMENT CORP. 5893 CONCORD TELEPHONE LONG DISTANCE (CT LONG DISTANCE) 5894 OKLAHOMA LONG DISTANCE 5895 METROTEL COMMUNICATIONS 5945 NEW TIMES, INC. 5950 FEDERAL TRANSTEL, INC 5953 LYNK SYSTEMS, INC. 5959 FEDERAL TRANSTEL, INC 5969 FONES WEST DIGITAL SYSTEMS 5978 WESTEL TELECOMMUNICATIONS LTD. 5999 DELUXE DATA SYSTEMS

15 TABLE 3 LIST OF FGB CIC CODE ASSIGNMENTS SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 5104 AAA TELEPHONE & COMMUNICATIONS INC. 0004 ATX TELECOMMUNICATIONS SERVICES 1234 ACC LONG DISTANCE CORPORATION 5300 AT&T BELL LABORATORIES 1345 ACC LONG DISTANCE CORPORATION 1869 AT&T CANADA LONG DISTANCE SERVICES CO. 1991 ACCESS LONG DISTANCE 1858 AT&T CANADA LONG DISTANCE SERVICES CO. 0937 ACCESS LONG DISTANCE 1686 AT&T CANADA LONG DISTANCE SERVICES CO. 0013 ACCESS SERVICES dba PACIFIC NW TELECOM 1732 AT&T COMMUNICATIONS 0551 ACCESS-PLUS, INC. 1288 AT&T COMMUNICATIONS 0282 ACTION TELCOM CO. 0988 AT&T EASYLINK SERVICES 1506 ADP AUTONET 0375 AT&T EASYLINK SERVICES 0260 ADVANCED COMMUNICATIONS SYSTEMS INC. 1314 AT&T WIRELESS SERVICES, INC. 1567 ADVANCED MKG. SVCS., dba DIAL ANYWHERE 0302 AUSTIN BESTLINE 0927 ADVANCED RADIO COMMUNICATIONS SYSTEMS 1235 AUTOMATED TELEPHONE 5224 ADVANTAGE COMMUNICATIONS GROUP, INC. 5801 AVIRNEX COMMUNICATIONS GROUP 5754 ADVANTIS 1992 A.B.E. OF ALABAMA, INC. dba ECONOLINE 1754 ADVANTIS 0956 BANK OF AMERICA, NT & SA 5772 ADVANTIS 5556 BAY SPRINGS LONG DISTANCE 1772 ADVANTIS 0190 BCS COMMUNICATIONS 1755 ADVANTIS 1243 BEEHIVE TELEPHONE CO., INC. 1436 ALARM CENTER, INC. 0652 BELL ATLANTIC COMMUNICATIONS, INC. 0886 ALIANT SYSTEMS, INC. 0272 BELL ATLANTIC COMMUNICATIONS, INC. 0579 ALIANT SYSTEMS, INC. 5062 BELLSOUTH BUSINESS SYSTEMS 1075 ALLCOMM LONG DISTANCE, INC. 5063 BELLSOUTH BUSINESS SYSTEMS 1148 ALLEGAN CELLULAR L.P. 5061 BELLSOUTH BUSINESS SYSTEMS 1044 ALLNET COMM. SVC. INC. [LDX,LEXITEL] 5478 BELLSOUTH TELECOMMUNICATIONS 1444 ALLNET COMM. SVC. INC. [LDX,LEXITEL] 5276 BELLSOUTH TELECOMMUNICATIONS 1539 ALLNET [LEXITEL/LDX] 0950 BENEFICIAL DATA PROCESSING CORP. 1066 ALLNET [LEXITEL/LDX] 0867 BITTEL TELECOMMUNICATIONS CORP. 1061 AMERICAN COMMUNICATIONS NETWORK 1820 BIZTEL LTD. 1645 AMERICAN COMMUNICATIONS TECHNOLOGY, INC. 0870 BLUE RIDGE TELEPHONE 1411 AMERICAN EXPRESS TRAVEL RELATED SVCS. 5775 BMG 1251 AMERICAN INT'L. TELECOMMUNICATIONS 1037 BN1 TELECOMMUNICATIONS, INC. 0028 AMERICAN LONG DISTANCE CORPORATION 5836 BRANSON TELEPHONE 1241 AMERICAN LONG LINES 5768 BRINDLEE MOUNTAIN TELEPHONE COMPANY 0773 AMERICAN L.D. OPERATOR SERVICE CO. 5115 BROOKS FIBER COMMUNICATIONS 1437 AMERICAN NATIONAL TELCOM 1821 BT NORTH AMERICA, INC. 0370 AMERICAN NETWORK EXCHANGE INC. 5368 BUDGET CALL LONG DISTANCE 5163 AMERICAN NORTEL COMM. INC. 1833 BUSINESS TELECOM, INC. 0322 AMERICAN SHARECOM, INC. 5171 BUYPASS CORPORATION 1231 AMERICAN SHARECOM, INC. 1281 BUYPASS CORPORATION 1400 AMERICAN SHARECOM, INC. 5098 B.P. OIL COMPANY 0663 AMERICAN TELCO NETWORK SERVICES INC. 0223 CABLE & WIRELESS COMMUNICATIONS, INC. (TDX) 0366 AMERICAN TELCO, INC. 0839 CABLE & WIRELESS COMMUNICATIONS, INC. (TDX) 1573 AMERICAN TELECOMMUNICATIONS HOLDING LTD. 0566 CABLE & WIRELESS COMMUNICATIONS, INC. (TDX) 1362 AMERISYSTEMS, INC. 5819 CABLEVISION LIGHTPATH, INC. 1039 AMERISYSTEMS, INC. 1287 CALIFORNIA STATE LOTTERY 5025 AMERITECH 1344 CALL AMERICA BUSINESS COMM. CORP. 5050 AMERITECH SERVICES 1351 CALL AMERICA OF RIVERSIDE 5678 AMERITECH SERVICES 0410 CALL AMERICA/PALM DESERT 5555 AMERITECH SERVICES 1291 CALL SAVERS, INC. 0794 AMERITEL 1091 CALL TECHNOLOGY CORP. OF PHILADELPHIA 1964 AMERITEL LONG DISTANCE FOR LESS 1219 CALL USA CORP. 0959 AMRIGON ENTERPRISES, INC. 0487 CAMBRIDGE COMMUNICATIONS 1514 ANNE ARUNDEL COUNTY 1670 CAMERON LONG DISTANCE 1613 AN-SER SERVICES (FROMM SERVICES, INC.) 5615 CAM-NET COMMUNICATIONS NETWORK, INC. 5068 APPLIED SIGNAL CORPORATION 1046 CAM-NET, INC. 5031 ARC NETWORKS 1425 CAPITAL NETWORK SYSTEMS INC. 0639 ARCADA COMMUNICATIONS 0221 CAPITAL TELECOMMUNICATIONS, INC. 5778 ARCO PAYPOINT 1963 CAPITAL TELECOMMUNICATIONS, INC. 5051 ARKANSAS BLUE CROSS BLUE SHIELD 5795 CAPROCK COMMUNICATIONS 5052 ARKANSAS BLUE CROSS BLUE SHIELD 1292 CARD ESTABLISHMENT SERVICES 5012 ARRIVA COMMUNICATIONS, INC. 1692 CARD ESTABLISHMENT SERVICES 1704 ARTHUR ANDERSON & CO. 1492 CARD ESTABLISHMENT SERVICES 5708 ARTHUR ANDERSON & CO. 1383 CARIBBEAN TELEPHONE & TELEGRAPH, INC. 5783 ARTHUR ANDERSON & CO. 0788 C-COM 0139 ASCENDING TECHNOLOGIES 1554 CELLTOLL CORPORATION 1419 ASSOCIATED GROCERS, INC. 5757 CELLULAR ONE WASHINGTON/BALTIMORE 1279 ASSOCIATED TELENET INC./ A CTI COMPANY 5151 CELLULAR ONE WASHINGTON/BALTIMORE 1125 ATLANTIC TELEPHONE COMPANY, INC. 5656 CELLULAR ONE WASHINGTON/BALTIMORE 0913 ATS COMMUNICATIONS, INC. 5858 CELLULAR ONE WASHINGTON/BALTIMORE

16 TABLE 3 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 5282 CELLULAR ONE WASHINGTON/BALTIMORE 5340 DELUXE DATA SYSTEMS 1399 CENTRAL NEW YORK TALK-TRANSIT 1326 DIAL AMERICA, INC. 1550 CENTURY LONG DISTANCE 1350 DIAL-NET, INC. 0914 CENTURY TELECOMMUNICATIONS, INC. 1250 DIAL-NET, INC. 0505 CENTURY TELECOMMUNICATIONS, INC. 1768 DIGINET COMMUNICATIONS 0909 CHADWICK TELEPHONE 0853 DIGITAL NETWORK, INC. 5323 CHARITON VALLEY LONG DISTANCE CORPORATION 1972 DIGITAL NETWORK, INC. 1285 CHECKRITE 1586 DIGITAL NETWORK, INC. 1286 CINCINNATI BELL LONG DISTANCE 0071 DIGITAL NETWORK, INC. 1293 CINCINNATI BELL LONG DISTANCE 1850 DIGITEL 0654 CINCINNATI BELL LONG DISTANCE 0320 DIGITEL 1614 CINCINNATI BELL LONG DISTANCE 1064 DNS, INC. 5477 CITILINK OF UT, L.L.C. 1430 DOMINO'S PIZZA INC. 0774 CITYNET COMMUNICATIONS, INC. 1808 EASTERN TELECOM GROUP 5267 CMS COMMUNICATIONS 0136 EASTERN TELECOM INTERNATIONAL 1629 COACHELLA VALLEY COMM., dba INTEG. OPER. SVCS. 1054 EASTERN TELEPHONE SYSTEMS, INC. 1902 COAST TO COAST TELECOMMUNICATIONS 0356 EASTMAN KODAK COMPANY 0966 COASTAL AUTOMATED COMMUNICATIONS CORP. 0327 ECI COMMUNICATIONS 5136 COASTAL LONG DISTANCE SERVICES, INC. 0497 ECON-A-CALL INC. OF HAYS 1881 COASTAL TELEPHONE COMPANY 1325 ECONO CALL LONG DISTANCE SERVICES 0661 COASTAL TELEPHONE COMPANY 0634 ECONO-LINE MIDLAND 1661 COASTAL TELEPHONE CO. 0373 ECONO-LINE WACO 5252 COLORADO CITY LINK 0060 ECONOMY TELEPHONE, INC. 1619 COLORADO RIVER COMMUNICATIONS 1273 EDS 0306 COLORADO RIVER COMMUNICATIONS 1802 ELECTRIC LIGHTWAVE, INC. 1611 COMCENTRAL, INC. 5365 EMI COMMUNICATIONS CORP. 1602 COMLINK USA 1809 ENVOY 1336 COMMONWEALTH LONG DISTANCE CO. 5083 ENVOY CORPORATION 0339 COMMUNICATION CABLE LAYING CO., INC. 5089 ENVOY CORPORATION 0349 COMMUNICATION CABLE LAYING CO., INC. 5800 ENVOY CORPORATION 0675 COMMUNICATION SERVICES OF COLORADO 5867 EQUAL ACCESS OF WASHINGTON 1502 COMMUNICATION TELESYSTEMS INTL. (CTS) 1342 EQUITABLE GAS 1667 COMMUNICATIONS INC., dba ECI 5600 ESCONDIDO TELEPHONE COMPANY 1073 COMMUNICATIONS OPTIONS, INC. 0441 ESCONDIDO TELEPHONE COMPANY 1484 COMMUNITY LONG DISTANCE INC. 5379 E-SCRIPT L.L.C. 1716 COMPUSERVE 0592 ESS VENTURES, INC. 5238 COMPUSERVE 5500 ESS VENTURES, INC. 5237 COMPUSERVE 5766 ETSC 5239 COMPUSERVE 0048 ETSC 5240 COMPUSERVE 0752 EXCEL TELECOMMUNICATIONS, INC. 0266 COMSYSTEMS NETWORK SERVICES 5432 EXCEL TELECOMMUNICATIONS, INC. 5893 CONCORD TELEPHONE LONG DISTANCE (CT LONG DISTANCE) 0486 EXECULINES OF SACRAMENTO 5299 CONNECTNET 0511 EXECULINES OF SACRAMENTO 1319 CONQUEST 1831 EXECULINES OF SACRAMENTO 1257 CONQUEST 1633 EXECULINES OF SACRAMENTO, INC. 1239 CONSOLIDATED COMMUNICATIONS CORPORATION 0202 EXECULINES OF THE NORTHWEST, INC. 1725 CONSOLIDATED NETWORK, INC. 0705 EXECULINES OF THE NORTHWEST, INC. 1646 CONTACT AMERICA, INC. 1865 EXPRESS COMMUNICATIONS, INC. 5559 COOPERATIVE COMMUNICATIONS, INC. 1493 EXTELCOM dba EXPRESS TEL 5752 CORESTATES FINANCIAL CORP 1429 EXTELCOM dba EXPRESS TEL 5750 CORESTATES FINANCIAL CORP 1435 EXTELCOM dba EXPRESS TEL 5751 CORESTATES FINANCIAL CORP 1494 EXTELCOM dba EXPRESS TEL 1690 CORPORATE TELEMANAGEMENT GROUP 1447 FAXNET CORPORATION 0470 COSHOCTON L.D.S. 0922 FEB CORPORATION 5035 COUNTY OF MONTGOMERY COMMUNICATIONS DIV. 5950 FEDERAL TRANSTEL, INC 5269 COX COMMUNICATIONS, INC. 5959 FEDERAL TRANSTEL, INC 5832 CROSSCHECK 5777 FEDERAL TRANSTEL, INC 5834 CTS TELCOM OF FLORIDA 5465 FEDERAL TRANSTEL, INC 1203 CYPRESS TELECOMMUNICATIONS CORP. (CYTEL) 5623 FEDERAL TRANSTEL, INC 1615 C.P.I. dba GULF STATES COMMUNICATIONS 0679 FEIST LONG DISTANCE 1361 DAKOTA COOPERATIVE TELECOMM., INC. 0475 FIBERFONE OF FLORIDA, INC. 5557 DAKOTA TELECOM, INC. (DTI) 0825 FIBERLINE NETWORK COMMUNICATIONS L.P. 1941 DATA COM 5111 FIBERNET TELEMANAGEMENT, INC. 1233 DELTACOM LONG DISTANCE SERVICES 5391 FIFTH THIRD BANK 1240 DELTACOM, INC. 0277 FIRST CHOICE LONG DISTANCE, INC. 5359 DELUXE DATA SYSTEMS 1935 FIRST CHOICE LONG DISTANCE, INC. 5999 DELUXE DATA SYSTEMS 1472 FIRST CHOICE LONG DISTANCE, INC. 0693 DELUXE DATA SYSTEMS 1324 FIRST COMMUNICATIONS, INC. (FDR) 5693 DELUXE DATA SYSTEMS 5173 FIRST DATA RESOURCES, INC. (FST)

17 TABLE 3 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 1337 FIRST DATA RESOURCES, INC. (FST) 0402 INTEGRETEL, INC. 1841 FIRST FINANCIAL MANAGEMENT CORP. 1465 INTELCO 5222 FIRST FINANCIAL MANAGEMENT CORP. 5599 INTELCOM GROUP (USA), INC. 5888 FIRST FINANCIAL MANAGEMENT CORP. 1463 INTELENET COMMISSION 5545 FIRST FINANCIAL MANAGEMENT CORP. 5424 INTELLICALL 5666 FIRST FINANCIAL MANAGEMENT CORP. 0616 INTER COMM. MANAGEMENT NETWORK 5315 FIRST HAWAIIAN BANK 0025 INTER CONTINENTAL TELEPHONE 5184 FIRST NATIONAL BANK OF MARYLAND 0393 INTERMEDIA COMMUNICATIONS, INC. 5183 FIRST NATIONAL BANK OF MARYLAND 0664 INTERMOUNTAIN DIGITAL NETWORK 5182 FIRST NATIONAL BANK OF MARYLAND 1076 INTERNATIONAL TELEMEDIA ASSOCIATES, INC. 5181 FIRST NATIONAL BANK OF MARYLAND 0596 INTERNET, INC. 5180 FIRST NATIONAL BANK OF MARYLAND 5064 INTERNET, INC. 1206 FIRST OF AMERICA BANK SE MICHIGAN N.A. 5065 INTERNET, INC. 5254 FIRST USA 1685 INTL.800 TELECOM dba TELECALL LONG DIST. 5475 FIRSTEL 1283 IOWA COMMUNICATIONS NETWORK 1739 FLAT RATE COMMUNICATIONS 1225 IOWA NETWORK SERVICES, INC. 0197 FLEABUSTERS 0065 ISACOMM, INC. [SPRINT] 1096 FLEX COMMUNICATIONS SYSTEM 1478 ITC NETWORKS OF UTAH 1010 FLEX COMMUNICATIONS SYSTEM 1897 ITC NETWORKS OF UTAH 5969 FONES WEST DIGITAL SYSTEMS 1468 ITC NETWORKS OF UTAH 1377 FONES WEST DIGITAL SYSTEMS 1947 ITI INCORPORATED 0985 FONOROLA 5588 IT&E OVERSEAS, INC. 5507 FONOROLA 5566 IT&E OVERSEAS, INC. 0637 FOX COMMUNICATIONS CORP. 5511 IT&E OVERSEAS, INC. 0211 FRONTIER COMMUNICATIONS INTERNATIONAL, INC. 5483 IT&E OVERSEAS, INC. 1003 FRONTIER COMMUNICATIONS INTERNATIONAL, INC. 5522 IT&E OVERSEAS, INC. 1515 FRONTIER COMMUNICATIONS OF NEW ENGLAND, INC. 1696 JC PENNEY BUSINESS SERVICES 1058 FRONTIER COMMUNICATIONS OF THE GREAT LAKES, INC. 5079 JC PENNEY BUSINESS SERVICES 1500 FRONTIER COMMUNICATIONS OF THE GREAT LAKES, INC. 0062 KENTUCKY TELEPHONE CORP. 1232 FRONTIER COMMUNICATIONS OF THE GREAT LAKES, INC. 1703 KEYSTONE TELECOMMUNICATIONS INC. 0086 FRONTIER COMMUNICATIONS OF THE MID ATLANTIC, INC. 1545 KEYSTONE TELECOM, INC. 1694 FRONTIER LONG DISTANCE AMERICA 0989 KRB TELECOM 5735 FTI COMMUNICATIONS 0218 KRISTIN ENTERPRISES dba TEL-CENTRAL 1728 GARDEN STATE LONG DISTANCE TELEPHONE 0552 LAKE STATES COMMUNICATIONS 1997 GAS COMPANY OF NEW MEXICO 5535 LAKEDALE LINK, INC. 1195 GASCARD 5013 LANSER TELECOM, INC. 1077 GENERAL COMMUNICATION, INC. 1562 LCI 1434 GENERAL ELECTRIC INFORMATION SERVICES 1452 LCI INTERNATIONAL 1836 GENERAL SERVICES ADMINISTRATION 1432 LCI INTERNATIONAL 5186 GLENS FALLS HOSPITAL 0537 LCI INTERNATIONAL 1295 GLENS FALLS LONG DISTANCE SERVICE 1451 LCI INTERNATIONAL 0469 GMW COMPANY 0358 LCI INTERNATIONAL TELECOM CORP. 5175 GROCERS SUPPLY COMPANY, INC. 0561 LCT LONG DISTANCE 1583 GST NET, INC. 0684 LCT LONG DISTANCE 0760 GTE TELECOM 1628 LDDS 1962 GULF LONG DISTANCE, INC. 1299 LECNET 0089 HARBOR BAY TELECOMMUNICATIONS 1507 LEE HARBOR HOMES 5399 HARMONIC SYSTEMS INCORPORATED 5438 LERMER OVERSEAS TELECOMMUNICATIONS, INC. 5398 HARMONIC SYSTEMS INCORPORATED 1708 LIGHT LINK, INC. dba TAYLOR COMM. GRP. 5397 HARMONIC SYSTEMS INCORPORATED 1563 LINKUSA CORPORATION 5396 HARMONIC SYSTEMS INCORPORATED 1012 LITEL/LCI INTERNATIONAL 5395 HARMONIC SYSTEMS INCORPORATED 1236 LITEL/LCI INTERNATIONAL 0015 HAWAIIAN TELEPHONE COMPANY 1253 LITEL/LCI INTERNATIONAL 0049 HEDGES & ASSOCIATES 5610 LMG TEL, INC 1722 HI-PLAINS NTS COMMUNICATIONS 0035 LONG DISTANCE AMERICA 0965 HOGAN COMMUNICATIONS 0607 LONG DISTANCE COMMUNICATIONS 5293 HORIZON CELLULAR TELCO 1533 LONG DISTANCE DISCOUNT, INC. 5484 HORIZON TELECOMMUNICATIONS, INC. 1536 LONG DISTANCE MANAGEMENT 1819 HUB DISTRIBUTING, INC. 1382 LONG DISTANCE MANAGEMENT, INC. 5419 H.G. TELECOM, INC. 1631 LONG DISTANCE OF MICHIGAN 1426 IBM 1564 LONG DISTANCE OHIO, INC. 1706 ICON COMMUNICATIONS CORPORATION 1036 LONG DISTANCE SAVERS 5327 IEC COMMUNICATIONS, INC. 1318 LONG DISTANCE SAVERS 1141 IFC COMMUNICATIONS 1213 LONG DISTANCE TELEPHONE SAVERS 0527 INDEPENDENCE TELEPHONE CO. 1252 LONG DISTANCE/USA [SPRINT] 1483 INDEPENDENT LONG DISTANCE 1871 LOYD COMM. dba COMTEL/HOT SPRINGS 1460 INDEPENDENT NETWORK SERVICES 5953 LYNK SYSTEMS, INC. 1791 INFOCOM INTERNATIONAL, INC. 0931 L.D. NETWORK, INC. 1510 INNOVATIVE COMMUNICATIONS, INC. 0005 MACY'S OF CALIFORNIA

18 TABLE 3 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 1094 MAG CARD 0017 NCHE TELECOMMUNICATIONS NETWORK, INC. 0357 MANITOWOC LONG DISTANCE SERVICE 1098 NETECH COMM., A US WEST COMPANY 1014 MARATHON COMMUNICATIONS 1026 NET-TEL CORPORATION 5468 MARYLAND STATE GOVERNMENT 1978 NETWORK BILLING & COLLECTION, INC. (NBC) 5624 MASTERCARD INTERNATIONAL 5577 NETWORK CARRIER SERVICES 5247 MASTERCARD INTERNATIONAL 0765 NETWORK LONG DISTANCE 5347 MASTERCARD INTERNATIONAL 5717 NETWORK ONE, INC. 5654 MASTERCARD INTERNATIONAL 5945 NEW TIMES, INC. 0624 MASTERCARD INTERNATIONAL 5106 NEW YORK LOTTERY 1780 MATRIX TELECOM 5119 NEXTLINK 1183 MCI 1581 NORCOMM 1222 MCI 1582 NORCOMM 1188 MCI 1933 NORTH AMERICAN COMMUNICATIONS, INC. 1122 MCI 1890 NORTH COUNTY COMMUNICATIONS CORP. 1133 MCI 5679 NORTH PITTSBURGH TELEPHONE COMPANY 1986 MCI 1491 NORTHERN ARIZONA COMMUNICATIONS CORP. 1826 MCI 1332 NORTHLAND TELEPHONE SYSTEMS LTD. 1022 MCI 0638 NORTHWEST TELECOM, LTD. 0888 MCI 0908 NTC, INC. 1622 MEDE AMERICA 0687 NTS COMMUNICATIONS, INC. 5587 MELLON BANK N.A. 0698 NYNEX 5236 MELLON BANK N.A. 5047 NYNEX 5560 MELLON BANK N.A. 5048 NYNEX 0761 MELLON BANK N.A. 5210 NYNEX 5698 MELLON BANK N.A. 5110 NYNEX 5038 MERCHANT LINK, INC. 0805 OCI 5039 MERCHANT LINK, INC. 0658 OCI 1655 MERCHANT-LINK, INC. 1359 OFF CAMPUS COMMUNICATIONS 5037 MERCHANT-LINK, INC. 1644 OHIO DEPARTMENT OF ADMINISTRATIVE SVCS. 5036 MERCHANT-LINK, INC. 5446 OHIO DEPARTMENT OF ADMINISTRATIVE SVCS. 1565 METRO ONE DIRECT 5627 OHIO DEPARTMENT OF ADMINISTRATIVE SVCS. 1860 METRO TELECOMM.SVCS., INC. dba METROCOMM 5894 OKLAHOMA LONG DISTANCE 1635 METRO TELEPHONE INC. 1391 OMNICALL COMMUNICATIONS CORPORATION 5895 METROTEL COMMUNICATIONS 1226 ONE CALL COMMUNICATIONS 5682 METROTIME COMMUNICATIONS 1880 ONE CALL COMMUNICATIONS 1440 MFS INTELENET, INC. 1873 ONE STAR LONG DISTANCE 1648 MID MCND dba MIDCOM COMMUNICATIONS, INC. 5390 ONE-2-ONE COMMUNICATIONS 1621 MID TNC dba MIDCOM COMMUNICATIONS, INC. 5607 ONE-2-ONE COMMUNICATIONS 0996 MIDCO COMMUNICATIONS 5121 ONE-2-ONE COMMUNICATIONS 0338 MIDCO COMMUNICATIONS 0390 ONE-2-ONE COMMUNICATIONS 0558 MIDCOM OF ARIZONA, INC. 5854 ONEIDA COUNTY TELEPHONE LONG DISTANCE 0519 MIDCOM, INC. 1891 OPERATOR SERVICE COMPANY 1816 MID-TEL L.D,. INC. OF WILLISTON 0695 OPTICALL COMMUNICATIONS SERVICES 1932 MID-TEL L.D. OF MINOT 1651 O.L.C. COMPANY 1980 MIDWEST TELECOM 0572 PAC TEL PAGING, A PACIFIC TELESIS CO. 1680 MIDWEST TELEPHONE SERVICE, INC. 0757 PACE LONG DISTANCE SERVICE 0264 MIIC dba POLARIS TELCOM 0297 PACIFIC GATEWAY EXCHANGE 5747 MINNESOTA STATE RELAY - TRIAD BOARD 5131 PACIFIC TELECOM, INC. (PTI) 5601 MISSOURI LOTTERY 1099 PAC-WEST TELECOMM, INC. dba AMERICALL 1392 MOBIL OIL CREDIT CORP. 1262 PAC-WEST TELECOMM, INC. dba AMERICALL 0608 MODULAR DATA, INC. 1261 PAC-WEST TELECOMM, INC. dba AMERICALL 0517 MONTANA LONG DISTANCE, INC. 1717 PASS WORD, INC. 1305 MOTOROLA INC. 1412 PENN TELECOM, INC. 0912 MRC TELECOMMUNICATIONS, INC. 1216 PENNY FONE 1674 MSI COMMUNICATIONS, INC. 1779 PEOPLES PHONE COMPANY 1379 MSI COMMUNICATIONS, INC. 1227 PEOPLES TELEPHONE COMPANY, INC. 0806 NACT 0490 PHOENIX COMMUNICATIONS GROUP, INC. 1549 NATIONAL BRANDS, INC. 5011 PHOENIX NETWORK 1632 NATIONAL DATA CORPORATION 0420 PHOENIX NETWORK 0861 NATIONAL PAYPHONE SUPPLY dba RATE SAVER 5010 PHOENIX NETWORK 0657 NATIONAL TELECOM. OF FLORIDA 5700 PHOENIX NETWORK 0067 NATIONAL TELEPHONE COMMUNICATIONS, INC. 0244 PHOENIX NETWORK 0746 NATIONAL TELEPHONE EXCHANGE (PA) 0714 PHONELINK, INC. 1341 NATIONAL TELE-SAV, INC. 1930 PILGRIM TELEPHONE INC. 1623 NATIONAL TELESERVICE 0905 PIZZA HUT, INC. 1401 NATIONAL TELESERVICE 5611 PNG TELECOMMUNICATIONS 0627 NATIONWIDE EMERGENCY TELECOMM. SYSTEM 5526 POKA LAMBRO TELECOMMUNICATIONS, INC. 0057 NATIONWIDE LONG DISTANCE, INC. 1477 POPP TELECOM 1072 NBD BANK, NA 1822 PROFESSIONAL NETWORKS MANAGEMENT, INC.

19 TABLE 3 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0045 PSA, INC. 1245 TACONIC LONG DISTANCE SERVICE, CORP. 1249 PSP MARKETING GROUP, INC. 0110 TANDEM ACCESS FOR DATABASE QUERY 1830 PUBLIC SERVICE COMPANY OF NM 0214 TCA COMMUNICATIONS 5105 PUBLIC SERVICE COMPANY OF NM 0093 TCA COMMUNICATIONS 0740 PUBLIC SWITCH CORP. 1718 TCG 1676 PUGET SOUND BANK 1560 TCI COMMUNICATIONS, INC. . 5454 QUESTAR INFOCOMM INCORPORATED 1827 TCS NETWORK SERVICES 5067 RCX, INC. 1178 TEAM ELECTRONICS 5769 REAL CONNECT 0709 TEL AMERICA 1662 RESOURCE TECHNOLOGY 1729 TEL AMERICA 1793 RESPONSE TELCOM, L.P. 0700 TEL AMERICA 5194 RETAIL DATA NETWORKS (RDN) 1919 TEL NET INC. 5193 RETAIL DATA NETWORKS (RDN) 0378 TEL SERV 5192 RETAIL DATA NETWORKS (RDN) 1007 TELAMARKETING COMMUNICATIONS, INC. 5191 RETAIL DATA NETWORKS (RDN) 1522 TELAPEX LONG DISTANCE, INC. 5190 RETAIL DATA NETWORKS (RDN) 1973 TEL-A-SAVE COMMUNICATIONS SYSTEMS, LTD. 1764 ROANOKE TELEPHONE COMPANY 0083 TELCO 0521 ROANOKE & BOTETOURT TELEPHONE CO. 0699 TEL-COM, INC. 5075 ROCKEFELLER GROUP TELECOMM. SVCS. 1915 TELE TECH, INC. 5413 ROCKY MTN. HOSP dba BLUE CROSS OF CO 0529 TELECOM WEST 0618 RSL COM U.S.A. 0340 TELECOMM. TECHNOLOGIES, INC. (TEL-TECH) 0642 R,D,&J COMMUNICATIONS MGMT., INC. 1476 TELECOMPUTE CORPORATION 5070 SALT LAKE TEL-A-SYS. C/O THE TANNER GRP. 0220 TELECOM*USA [MCI] 5071 SALT LAKE TEL-A-SYS. C/O THE TANNER GRP. 1900 TELECOM*USA [MCI] 1591 SANTA FE RAILWAY 0832 TELECOM*USA [MCI] 1604 SB COMMUNICATIONS, INC. 1224 TELECOM*USA [MCI] 1898 SBS/MCI 1771 TELECOM*USA [MCI] 1088 SBS/MCI 0835 TELECOM*USA [MCI] 1018 SHARED USE NETWORK 1876 TELECOM*USA [MCI] 0207 SHENANDOAH LONG DISTANCE COMPANY 1852 TELECOM*USA [MCI] 1720 SILVERADO COMMUNICATIONS 1857 TELECOM*USA [MCI] 5377 SINCLAIR OIL CORP 1092 TELECOM*USA [MCI] 1641 SOURIS RIVER TELECOMMUNICATIONS COMPANY 1087 TELECOM*USA [MCI] 1807 SOUTH CAROLINA NETWORK, INC. 1321 TELECOM*USA [MCI] 5174 SOUTHEAST SWITCH 1518 TELECON COMMUNICATIONS CORPORATION 1812 SOUTHLAND CABLEVISION 0522 TELEFIND CORPORATION 1993 SOUTHWEST UNITED COMMUNICATION, INC. 5547 TELEFONICA LARGA DISTANCIA DE P.R., INC. 0056 SP TELECOM 1547 TELEFONICA LARGA DISTANCIA DE P.R., INC. 5653 SPECIALIZED TELECOMMUNICATIONS 5630 TELEGROUP 1333 SPRINT 5620 TELEHOP COMMUNICATIONS. INC. 0872 SPRINT 0887 TELEMANAGEMENT CONSULTANTS CORPORATION 1033 SPRINT 1689 TELEMANAGEMENT CONSULTANTS CORPORATION 1177 SPRINT 1620 TELEMONEY SERVICES, A FIRST DATA CORPORATION 0777 SPRINT 0759 TELENET COMM. CORP., (SPRINT) 1352 STANDARD TELCOM, INC. 0499 TELEPHONE ASSOC. dba THIEF RIVER FALLLS LD 1215 STAR TEL OF ABILENE 0837 TELEPHONE ASSOC. LONG DISTANCE SVCS. 0787 STAR TEL OF ABILENE 0829 TELEPHONE ASSOC. LONG DISTANCE SVCS. 1983 STAR TEL OF VICTORIA, INC. 5103 TELEPHONE BILLING SERVICE 1984 STAR TEL TRANSMISSION CO., INC. 1977 TELEPHONE COMMUNICATIONS CORPORATION 1439 STAR TEL, INC. 1673 TELEPHONE CONNECTIONS, INC. 1313 STAR TEL, INC. 1745 TELEPHONE ELECTRONICS NETWORK, LTD. 0210 STARLINE, INC. 0899 TELEPHONE EXPRESS 0480 STAT COMMUNICATIONS 0191 TELEPHONE SUPPORT SYSTEMS, INC. 0762 STATE OF CALIFORNIA - CALNET 0961 TELEPHONE SYSTEMS OF GEORGIA 5113 STATE OF CAL. HEALTH AND WELFARE AGENCY DATA CENTER 1149 TELEPHONE TOWNHALL MEETINGS, INC. 5325 STATE OF CAL. HEALTH AND WELFARE AGENCY DATA CENTER 1731 TELESCAN, INC. 5326 STATE OF CAL. HEALTH AND WELFARE AGENCY DATA CENTER 0380 TELESERV CORPORATION 1682 STATE OF MARYLAND (DEPT OF GEN.SERVICES) 1482 TELE-SYS, INC. 1769 STATE OF NEW YORK 1600 TELEVALUE CORP. dba ECON-O-DIAL RIDGECREST 0189 STATE OF TEXAS - GSC 0409 TELEVOX PUBLIC COMMUNICATIONS, INC. 0929 STENOCALL 1296 TELNEX, INC. 1784 SUNTEL NETWORK, INC. 5626 TEL-ONE 5228 SUPERTEL COMMUNICATIONS, INC. 0945 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 0171 SUPERTEL COMMUNICATIONS, INC. 0300 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 5226 SUPERTEL COMMUNICATIONS, INC. 1957 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 5227 SUPERTEL COMMUNICATIONS, INC. 0489 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 5229 SUPERTEL COMMUNICATIONS, INC. 1601 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 0275 SWIFF TRAIN COMMUNICATIONS 1587 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 0727 SWITCH 2000, INC. 0330 TEL-SHARE 1799 SYMTECH COMMUNICATIONS SERVICES 1520 TEL-SPAN COMMUNICATIONS, INC. 1666 SYSTEMS 1000 1363 TEL-TOLL dba ECON-O-DIAL OF BISHOP

20 TABLE 3 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 1485 TELTRUST, INC. 0074 VALU-LINE OF ANGLETON 1707 TELVUE CORPORATION 1678 VALU-LINE OF KANSAS, INC. 1828 TENCOM 5813 VALU-LINE OF LOUISIANA, INC. 5213 TEXACO REFINING AND MARKETING, INC. 0859 VALU-LINE OF LOUISIANA, INC. 1599 TEXAS LONG DISTANCE CONROE 1348 VALU-LINE OF TRI-CITIES 1331 TEXUSTEL, INC. 1975 VARTEC NATIONAL, INC. 0268 THE COMMUNIGROUP 1595 VARTEC TELECOM, INC. 1268 THE COMMUNIGROUP OF KC 1811 VARTEC TELECOM, INC. 0885 THE COMMUNIGROUP OF KC 1750 VC TELECOMMUNICATION SYSTEMS 1998 THE COMMUNIGROUP OF KC 1783 VERTELCO SYSTEMS 5608 THE LONG DISTANCE PARTNERSHIP, L.P. 5885 VIATEL, INC. 5285 THE OHIO STATE UNIVERSITY 0770 VISA USA INC. 1798 THE PAY TELEPHONE COMPANY 0990 VISA USA INC. 1385 THE SWITCHBOARD 1939 VISTA-UNITED TELECOMMUNICATIONS 5882 THE TELEPHONE CONNECTION OF L.A., INC. 5648 VMA, INC. dba UNIVERSITY TELEPHONE SERVICES, INC. 0019 TMC LONG DISTANCE dba CHERRY COMMUNICATIONS, INC. 5721 VOICE TECHNOLOGY CORPORATION 0016 TMC LONG DISTANCE dba CHERRY COMMUNICATIONS, INC. 0384 VOICECOM SYSTEMS, INC. 0462 TMC OF LEXINGTON 1979 VORTEL COMMUNICATIONS, INC. 5128 TMC WORLDWIDE, INC. 5677 WATS/800 INC. 1335 TOUCH AMERICA, INC. 1712 WCS OPERATORS 1360 TOUCH AMERICA, INC. 1569 WEST COAST TELECOMMUNICATIONS, INC. 1994 TOUCH AMERICA, INC. 1052 WEST COAST TELECOMMUNICATIONS, INC. 1457 TRACE COMMUNICATIONS 1459 WESTCOM LONG DISTANCE 5829 TRANSACTION NETWORK SERVICES, INC. 5978 WESTEL TELECOMMUNICATIONS LTD. 5825 TRANSACTION NETWORK SERVICES, INC. 0085 WESTEL, INC. 1598 TRANSACTION NETWORK SERVICES, INC. 1443 WESTERN OKLAHOMA INFORMATION SYSTEMS 5225 TRANSACTION NETWORK SERVICES, INC. 1982 WESTERN TELECOMMUNICATION, INC. (WTCI) 5879 TRANSACTION NETWORK SERVICES, INC. 1701 WESTERN TELECOMMUNICATION, INC. (WTCI) 1864 TRANSNET 1431 WESTERN TELENET, INC. 1097 TRESCOM PUERTO RICO 1946 WESTINGHOUSE COMMUNICATIONS 1848 TRESCOM U.S.A, INC. 5101 WESTINGHOUSE COMMUNICATIONS 1394 TRESCOM U.S.A., INC./TRESCOM CARIBBEAN 5201 WESTINGHOUSE COMMUNICATIONS 1120 TRT TELECOMMUNICATIONS CORPORATION 5202 WESTINGHOUSE COMMUNICATIONS 0461 TTE OF CHARLESTON 5102 WESTINGHOUSE COMMUNICATIONS 0578 TTI TELECOMMUNICATIONS, INC. 5609 WHATCOM TELECOMM 1882 TUCK DATA COMMUNICATIONS 0952 WILKES LONG DISTANCE SERVICE 1009 TWT-HEARTLINE 1069 WILLAMETTE VALLEY TELCOM SERVICES 0229 U S COMNET 0884 WORLDCOM, INC. 5123 U S WEST COMMUNICATIONS 1315 WORLDCOM, INC. 0855 UNION TELEPHONE COMPANY 0868 WORLDCOM, INC. 0823 UNITED BANK OF DENVER 1290 WORLDCOM, INC. 1955 UNITED COMMUNICATIONS, INC. 0883 WORLDCOM, INC. 5085 UNITED REFINING COMPANY 0951 WORLDCOM, INC. 0542 UNITED STATES CELLULAR CORPORATION 1311 WORLDCOM, INC. 5082 UNITED TELEMANAGEMENT SERVICES, INC. 1312 WORLDCOM, INC. 1544 UNITED TELEPHONE CO. dba TELAMERICA L.D. 0987 WORLDCOM, INC. 0204 UNITED TELEPHONE LONG DISTANCE 1011 WORLDCOM, INC. 5353 US AIR 1082 WORLDCOM, INC. 5874 US COMMUNICATIONS,INC. 1212 WORLDCOM, INC. 0879 US COMMUNICATIONS,INC. 1208 WORLDCOM, INC. 1568 US COMM. INC, dba SOUTHWEST L.D.N, INC. 1008 WORLDCOM, INC. 1355 US LINK LONG DISTANCE 1084 WORLDCOM, INC. 0756 US LONG DISTANCE 1055 WORLDCOM, INC. 0030 US LONG DISTANCE 1021 WORLDCOM, INC. 0078 US LONG DISTANCE 1027 WORLDCOM, INC. 0070 US LONG DISTANCE 1217 WORLDCOM, INC. 0556 US LONG DISTANCE 1274 WORLDCOM, INC. 5008 US ONE COMMUNICATIONS CORP. 1050 WORLDCOM, INC. 0200 US WATS 1053 WORLDCOM, INC. 5842 US WEST INTERPRISE AMERICA, INC. 1254 WORLDCOM, INC. 5185 USA PAGING 1246 WORLDCOM, INC. 0228 USLINK LONG DISTANCE 1267 WORLDCOM, INC. 5054 USTEL 1001 WORLDCOM, INC. 5875 U.S. COMMUNICATIONS, INC. 1006 WORLDCOM, INC. 5876 U.S. COMMUNICATIONS, INC. 1031 WORLDCOM, INC. 5877 U.S. COMMUNICATIONS, INC. 1237 WORLDCOM, INC. 0271 U.S. NETWORK 1353 WORLDCOM, INC. 0298 U.S. NET, INC. 1464 WORLDCOM, INC. 1875 U.S. ORDER 1372 WORLDCOM, INC. 1040 U.S. SIGNAL CORPORATION 1918 WORLDCOM, INC. 0396 U.S. TELE-COMM, INC. 1921 WORLDCOM, INC. 0289 VACATION VILLAGES OF AMERICA, INC. 1042 WORLDCOM, INC. 0878 VALLEY STAR-TEL 0589 WORLDCOM, INC. 5523 VALUE TEL 1846 WORLDCOM, INC. 5268 VALU-LINE LONG DISTANCE 1862 WORLDCOM, INC. 5759 VALULINE LONG DISTANCE 1874 WORLDCOM, INC. 5032 VALULINE LONG DISTANCE 1895 WORLDCOM, INC. 0669 VALU-LINE OF AMARILLO 1910 WORLDCOM, INC.

21 TABLE 3 LIST OF FGB CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

ASSIGNED TO WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WORLDCOM, INC. WYNN-HILL NETWORK XPEDITE SYSTEMS, INC. YAVAPAI TELEPHONE EXCHANGE

22 TABLE 4 LIST OF FGD CIC CODE ASSIGNMENTS SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0001 WORLDCOM, INC. 0071 DIGITAL NETWORK, INC. 0002 WORLDCOM, INC. 0072 NBD BANK, NA 0003 FRONTIER COMMUNICATIONS INT'L, INC. 0073 COMMUNICATIONS OPTIONS INC. 0004 ATX TELECOMMUNICATIONS SERVICES 0074 USTEL 0005 SOUTHWESTERN TELECOM, INC. 0075 ALLCOMM LONG DISTANCE, INC. 0006 WORLDCOM, INC. 0076 INTERNATIONAL TELEMEDIA ASSOCIATES, INC. 0007 TELAMARKETING COMMUNICATIONS INC. 0077 GENERAL COMMUNICATION, INC. 0008 WORLDCOM, INC. 0078 ENHANCED SERVICES BILLING, INC. (ESBI) 0009 TWT-HEARTLINE 0079 RED ROSE SYSTEMS dba D&E LONG DISTANCE 0010 VALLEY TELEPHONE LONG DISTANCE 0080 WORLDCOM, INC. 0011 WORLDCOM, INC. 0081 TOTAL-TEL USA, INC. 0012 LCI INTERNATIONAL 0082 DISCOUNT PAYPHONE 0013 ACCESS SERVICES dba PACIFIC NW TELECOM 0084 WORLDCOM, INC. 0014 MARATHON COMMUNICATIONS 0085 WESTEL, INC. 0015 HAWAIIAN TELEPHONE COMPANY (GTE) 0086 FRONTIER COMMUNICATIONS INT'L, INC. 0016 TMC LONG DISTANCE dba CHERRY COMMUNICATIONS, INC. 0087 TELECOM*USA [MCI] 0017 NCHE TELECOMMUNICATIONS NETWORK, INC. 0088 SBS/MCI 0018 SHARED USE NETWORK 0090 WESTEL, INC. 0019 TMC LONG DISTANCE dba CHERRY COMMUNICATIONS, INC. 0091 CALL TECHNOLOGY CORP. OF PHILADELPHIA 0020 INNOVATIVE TELECOM CO. 0092 MCI 0021 WORLDCOM, INC. 0093 MELBOURNE INTERNATIONAL COMM. LTD. 0022 MCI 0094 NOSVA, L.P. 0023 IDS LONG DISTANCE, INC. 0095 APPLE COMMUNICATIONS 0024 PRIMUS 0096 CITIZENS TELECOM 0025 INTER CONTINENTAL TELEPHONE 0097 TRESCOM PUERTO RICO 0026 NET-TEL CORPORATION 0098 NETECH COMM. A US WEST COMPANY 0027 NORTH AMERICAN COMMUNICATIONS GROUP 0099 PAC-WEST TELECOMM, INC. dba AMERICALL 0028 AMERICAN LONG DISTANCE CORPORATION 0110 TANDEM ACCESS FOR DATABASE QUERY 0029 TELECOMMUNICATIONS CONSULTANTS, INC. 0111 ROSEVILLE TELEPHONE CO. 0030 U.S. LONG DISTANCE, INC. 0112 BUSINESS DISCOUNT PLAN dba LD DISCOUNT PLAN 0031 WORLDCOM, INC. 0113 AMERITECH LONG DISTANCE SERVICES 0032 UNITED COMMUNICATIONS ASSN., INC. 0114 TELELINK 0033 SPRINT 0115 BKC TELECOMMUNICATIONS, INC. 0034 INTELLICALL OPERATOR SERVICES 0116 TELNET GLOBAL COMMUNICATIONS 0035 LONG DISTANCE AMERICA 0117 CELLNET 0036 LONG DISTANCE SAVERS 0118 A & N TELECOM 0037 BN1 TELECOMMUNICATIONS, INC. 0119 ALO-USA CORP. 0038 CITIZENS TELECOM 0120 TRT TELECOMMUNICATIONS CORPORATION 0040 US SIGNAL CORPORATION 0121 FUTURE TELEPHONE COMMUNICATIONS 0041 VTA, INC. 0122 MCI 0042 TELECOMMUNICATION SYSTEMS 0123 DISCOVERY TELECOM, INC. 0043 CONSOLIDATED COMM. PUBLIC SERVICES 0124 HORRY TELEPHONE LONG DISTANCE, INC. 0044 ALLNET COMM. SVC., INC. [LDX,LEXITEL] 0125 ATLANTIC TELEPHONE COMPANY, INC. 0045 PSA, INC. 0126 SONIC COMMUNICATIONS, INC. 0046 CAM-NET, INC. 0127 CORPORATE COMMUNICATIONS GROUP, INC. 0047 RANGER TELECOMMUNICATIONS 0129 BAYSTAR SATELLITE PAGING 0048 ETSC 0130 COMPUTER TELEPHONE CORP. 0049 HEDGES & ASSOCIATES 0131 USP&C, INC. 0050 WORLDCOM, INC. 0132 MPC BUS. COMMS. SYSTEMS, INC./EASTON TELECOM SVCS. 0051 FIBERLINK COMMUNICATIONS CORP. 0133 MCI 0052 WEST COAST TELECOMMUNICATIONS, INC. 0134 RIKTEL COMMUNICATIONS, INC. 0053 WORLDCOM, INC. 0135 NETWORK ONE 0054 EASTERN TELEPHONE SYSTEMS, INC. 0136 EASTERN TELECOM INTERNATIONAL 0055 WORLDCOM, INC. 0137 ACCESS NETWORK SERVICES, INC. 0056 QWEST COMMUNICATIONS 0138 METCOM CANADA LIMITED 0057 NATIONWIDE LONG DISTANCE 0139 ASCENDING TECHNOLOGIES 0058 FRONTIER LOCAL SERVICES, INC. 0140 TRANS NATIONAL COMMUNICATIONS, INC. 0059 NATIONAL INDEPENDENT CARRIER EXCH., INC. 0141 IFC COMMUNICATIONS 0060 ECONOMY TELEPHONE, INC. 0142 WORLDCOM, INC. 0061 AMERICAN COMMUNICATIONS NETWORK, INC. 0143 DIGITAL NETWORK, INC. 0062 KENTUCKY TELEPHONE CORP. 0144 ASSOCIATION COMM. 0063 COAST INTERNATIONAL, INC. 0145 AMERICAN COMMUNICATIONS INT'L, LTD. 0064 DIGITAL NETWORK SERVICES, INC. 0146 PIONEER LONG DISTANCE 0065 COMMUNICATIONS SYSTEMS INTERNATIONAL 0147 DATA & ELECTRONIC SERVICES, INC. 0066 ALLNET 0148 KULL CELLULAR CORP.dba ALLEGAN CELLULAR 0067 T.B. ENTERPRISES 0149 TEL-COM TELECOMMUNICATIONS, INC. 0068 INTERSTATE SAVINGS 0170 MCLEOD NETWORK SERVICES 0069 LONG DISTANCE TRANSFER, INC. 0171 MULTIMEDIA LONG DISTANCE CO. 0070 U.S. LONG DISTANCE, INC. 0172 USP&C, INC.

23 TABLE 4 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0176 WBC COMMUNICATIONS, INC. 0251 PARTNERS TELECOM, INC. 0177 SPRINT 0252 LONG DISTANCE/USA [SPRINT] 0178 PDQ COMMUNICATIONS SOURCE 0253 LITEL/LCI INTERNATIONAL 0179 NETWORK MARKETING GROUP 0254 WORLDCOM, INC. 0180 CENTRAL TELEPHONE CO. 0255 PUBLIC PHONE 0181 DIGITAL COMMUNICATIONS, INC. 0256 APPLIED SIGNAL CORPORATION 0182 ALLGOOD TAYLOR TELEPHONE 0257 CONQUEST 0183 MCI METRO 0258 METRONET LONG DISTANCE COMMUNICATIONS 0184 STONE & COMPANY 0259 CALL FOR LESS LONG DISTANCE 0185 GTC 0260 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0186 STANDARD LONG DISTANCE 0261 HERTZ TECHNOLOGIES, INC. 0187 BELLSOUTH LONG DISTANCE 0262 CARIB COMMUNICATIONS, L.P. 0188 MCI/1-800-COLLECT 0263 WORLDCOM, INC. 0189 STATE OF TEXAS - GSC 0264 MIIC dba POLARIS TELCOM 0191 PARADISE COMMUNICATIONS 0266 WORLDCOM, INC. 0192 AMERINET COMMUNICATIONS 0267 WORLDCOM, INC. 0193 LANDMARK COMMUNICATIONS COMPANY, INC. 0268 THE COMMUNIGROUP 0194 EASTON TELECOM SERVICES, INC. 0269 TEL AMERICA L.D.T.S. 0195 STARCOM INTERNATIONAL OPTICS CORP. 0270 CHERRY COMMUNICATIONS 0197 COMANCHE COUNTY LONG DISTANCE 0271 U.S. NETWORK 0199 CRESCENT COMMUNICATIONS 0272 BELL ATLANTIC COMMUNICATIONS, INC. 0200 US WATS 0273 EDS . 0201 NORTH AMERICAN TELEPHONE 0274 WORLDCOM, INC. 0202 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0275 VEND-TEL-CO., LTD. 0203 CYPRESS TELECOMMUNICATIONS CORP. (CYTEL) 0276 BEE LINE LONG DISTANCE 0204 UNITED TELEPHONE LONG DISTANCE 0279 ASSOCIATED TELENET INC./ A CTI COMPANY 0205 LONE STAR TELECOM 0280 L.D. SERVICES, INC 0206 GLOBAL COM 0281 DIGITAL TECHNOLOGIES, INC. 0207 2JE TELECOMMUNICATIONS 0282 ACTION TELCOM CO. 0208 WORLDCOM, INC. 0283 IOWA COMMUNICATIONS NETWORK 0210 NOS COMMUNICATIONS, INC. 0284 AMERIVISION COMMUNICATIONS, INC. 0211 FRONTIER COMMUNICATIONS INT'L, INC. 0285 FEDERAL TRANSTEL, INC. 0212 WORLDCOM, INC. 0286 CINCINNATI BELL LONG DISTANCE 0213 LONG DISTANCE TELEPHONE SAVERS 0287 ATS NETWORK COMMUNICATIONS 0214 TCA COMMUNICATIONS 0288 AT&T COMMUNICATIONS 0215 PRONTO LONG DISTANCE INC. 0290 WORLDCOM, INC. 0216 METROLINK 0291 CALL SAVERS, INC. 0217 WORLDCOM, INC. 0292 TCG 0218 TEL-CENTRAL OF JEFFERSON CITY 0293 CINCINNATI BELL LONG DISTANCE 0219 TELEPHONE BILLING SERVICE 0295 GLENS FALLS LONG DISTANCE SERVICE 0220 TELECOM*USA [MCI] 0296 TELNEX, INC. 0221 CAPITAL TELECOMMUNICATIONS, INC. 0297 LONG DISTANCE WHOLESALE CLUB 0222 MCI 0298 U.S. NET, INC. 0223 CABLE & WIRELESS COMMUNICATIONS, INC. 0299 LECNET, INC. 0224 TELECOM*USA [MCI] 0300 CALL AMERICA 0225 IOWA NETWORK SERVICES, INC. 0301 WESTERN TELEPHONE & TELEVISION 0226 ONE CALL COMMUNICATIONS 0302 AUSTIN BESTLINE 0227 PEOPLE'S TELEPHONE COMPANY, INC. 0303 EASTERN TELELOGIC CORPORATION 0228 USLINK LONG DISTANCE 0304 ARCH TELECOM 0229 U S COMNET 0305 MOTOROLA INC. 0231 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0306 COLORADO RIVER COMMUNICATIONS 0232 FRONTIER COMMUNICATIONS OF THE GREAT LAKES, INC. 0307 AMERICAN TELNET, INC. 0233 DELTACOM L.D.S. 0308 NETWORK OPERATOR SERVICES, INC. 0234 ACC LONG DISTANCE CORPORATION 0310 INTERNATIONAL TELEPHONE CORP. (ITC) 0235 AUTOMATED TELEPHONE 0311 WORLDCOM, INC. 0236 LITEL/LCI INTERNATIONAL 0312 WORLDCOM, INC. 0237 WORLDCOM, INC. 0313 STAR TEL, INC. 0238 COMWEST COMMUNICATIONS 0314 AT&T WIRELESS SERVICES, INC. 0239 ADVANTAGE COMMUNICATIONS GROUP, INC. 0315 WORLDCOM, INC. 0240 DELTACOM L.D.S. 0316 ABCO COMMUNICATIONS, INC. 0241 AMERICAN LONG LINES 0319 CONQUEST 0242 SASKTEL 0321 TELECOM*USA [MCI] 0243 BEEHIVE TELEPHONE 0322 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0244 PHOENIX NETWORK 0323 BC TEL 0245 FRONTIER COMMUNICATIONS INT'L, INC. 0324 EDMONTON TELEPHONE CORPORATION 0246 WORLDCOM, INC. 0325 ECONO. CALL LONG DISTANCE SERVICES 0248 STANDARD COMMUNICATIONS, INC., dba SCI 0326 NATIONAL FIBERNET, INC. 0249 PSP MARKETING GROUP, INC. 0327 ECI COMMUNICATIONS 0250 WORLDCOM, INC. 0328 IDAHO STATE GOVERNMENT

24 TABLE 4 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0330 TEL-SHARE 0402 INTEGRETEL, INC. 0331 TEXUSTEL, INC. 0403 NATIONWIDE LONG DISTANCE 0332 NORTHLAND TELEPHONE SYSTEMS LTD. 0404 INTERNATIONAL TELCOM, LTD. 0333 SPRINT 0405 ALTERNATE COMMUNICATIONS TECHNOLOGY, INC. 0335 TOUCH AMERICA, INC. 0406 WORLDCOM, INC. 0336 COMMONWEALTH LONG DISTANCE CO. 0407 NUESTRA TELEFONICA 0338 MIDCO COMMUNICATIONS 0408 WORLDCOM, INC. 0339 COMMUNICATION CABLE LAYING CO., INC. 0409 TELEVOX PUBLIC COMMUNICATIONS, INC. 0340 HUB DISTRIBUTING, INC. 0410 CALL AMERICA/PALM DESERT 0341 NATIONAL TELE-SAV, INC. 0411 AMERICAN EXPRESS TRAVEL RELATED SVCS. 0342 PREMIER LONG DISTANCE SVCS. INC. 0412 PENN TELECOM, INC. 0343 CHESTER LONG DISTANCE SERVICES, INC. 0413 ALTERNATIVE LONG DISTANCE, INC. dba MONEY $AVERS 0344 GST CALL AMERICA 0414 ADDTEL COMMUNICATIONS 0345 ACC LONG DISTANCE CORPORATION 0415 ESPI, INC. 0346 TOTALNET COMMUNICATIONS, INC. 0416 AMERITEL C/O NETWORK TELEPHONE SVCS, INC. 0347 UNIVERSAL LONG DISTANCE, INC. 0417 DWR LONG DISTANCE 0348 SPRINT CANADA, INC. 0419 H.G. TELECOM, INC 0349 COMMUNICATION CABLE LAYING CO., INC. 0420 PHOENIX NETWORK 0350 FIBERNET TELEMANAGEMENT, INC. 0421 WORLDCOM, INC. 0351 CALL AMERICA OF RIVERSIDE 0422 ISLAND TEL, PEI 0352 STANDARD TELCOM, INC. 0423 NICKEL FONE 0353 WORLDCOM, INC. 0424 AGT LIMITED 0354 DISCOUNT LONG DISTANCE OF AMERICA 0425 CAPITAL NETWORK SYSTEMS INC. 0355 U. S. LINK 0426 VOYAGER NETWORKS, INC. 0356 BLUEGRASS LONG DISTANCE, INC. 0427 WESTERN TELECOM, INC. 0357 MANITOWOC LONG DISTANCE SERVICE 0428 WORLDCOM, INC. 0358 LCI INTERNATIONAL 0429 EXTELCOM dba EXPRESS TEL 0359 EMPIRE ONE TELECOMMUNICATIONS, INC. 0431 WESTERN TELENET, INC. 0360 TOUCH AMERICA, INC. 0432 LITEL/LCI INTERNATIONAL 0361 DAKOTA COOPERATIVE TELECOMM., INC. 0433 INFO-TEL, INC. 0362 AMERISYSTEMS, INC. 0434 MARITIME TEL & TEL 0363 BELL CANADA 0435 GLOBAL TELEMEDIA INTERNATIONAL, INC. 0364 EQUICOM COMMUNICATIONS, INC. 0438 SAM'S DISCOUNT LONG DISTANCE, INC. 0365 EMI COMMUNICATIONS CORP 0439 STAR TEL, INC. 0366 AMERICAN TELCO, INC. 0440 MFS INTELNET, INC. 0367 WHOLESALE COMMUNICATIONS 0441 ESCONDIDO TELEPHONE COMPANY 0368 BUDGET CALL LONG DISTANCE 0442 WORLDCOM, INC. 0369 LOMA INTERNATIONAL, INC. 0443 WESTERN OKLAHOMA INFORMATION SYSTEMS 0370 AMERICAN NETWORK EXCHANGE, INC. 0444 ALLNET COMM. SVC., INC. [LDX,LEXITEL] 0372 PACIFIC BELL COMMUNICATIONS 0445 NEWFOUNDLAND TELEPHONE 0373 ECONO-LINE WACO/ECONO-LINE MIDLAND 0446 WORLDCOM, INC. 0374 CONNECT AMERICOM CORP. 0447 FAXNET CORPORATION 0375 AT&T EASYLINK SERVICES 0448 NB TEL 0376 NORTHERN TELECOM, INC. 0449 MERRILL LYNCH 0377 BELLSOUTH LONG DISTANCE 0450 WORLDCOM, INC. 0378 TEL SERV 0451 LCI INTERNATIONAL 0379 FLEABUSTERS 0452 LCI INTERNATIONAL 0380 TELESERV CORPORATION 0453 WORLDCOM, INC. 0381 USN COMMUNICATIONS 0455 GLOBAL TEL*LINK, INC. 0382 LONG DISTANCE MANAGEMENT INC. 0456 WORLDCOM, INC. 0383 CARIBBEAN TELEPHONE & TELEGRAPH, INC. 0457 TELCO COMMUNICATIONS GROUP dba DIAL & SAVE 0384 TLD, INC. 0458 TELEMANAGEMENT CONSULTANTS CORPORATION 0385 THE SWITCHBOARD 0459 WESTCOM LONG DISTANCE 0386 CONTINENTAL CABLEVISION 0460 INDEPENDENT NETWORK SERVICES, INC. 0387 AT&T COMMUNICATIONS 0461 TTE OF CHARLESTON 0388 KDD AMERICA, INC. 0462 TMC OF LEXINGTON 0389 EATELNET 0463 REDWOOD LONG DISTANCE 0390 ONE-2-ONE COMMUNICATIONS 0464 WORLDCOM, INC. 0391 OMNICALL COMMUNICATIONS CORPORATION 0465 INTELCO 0392 HSS VENDING DISTRIBUTORS 0466 VIRGIN ISLANDS TELE-COM 0393 INTERMEDIA COMMUNICATIONS, INC. 0467 CHICKASAW LONG DISTANCE CO. 0394 TRESCOM U.S.A., INC./TRESCOM CARIBBEAN 0468 ITC NETWORKS 0395 LONG DISTANCE NETWORK 0469 GMW COMPANY 0396 U.S. TELE-COMM, INC. 0470 AMERICAN TEL GROUP, INC. 0397 TELALEASING ENT.INC dba PHONE ZONE INC. 0471 WORLDCOM, INC. 0398 M2 COMMS. dba DIAL LONG DISTANCE BILLING SVCS. 0472 FIRST CHOICE LONG DISTANCE, INC. 0399 TELCO HOLDINGS, INC. 0474 USN COMMUNICATIONS 0400 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0475 FIRSTEL 0401 NTI 0476 TEK COMMUNICATIONS, INC.

25 TABLE 4 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0477 POPP TELCOM 0550 CENTURY LONG DISTANCE 0478 ITC NETWORKS 0551 ACCESS-PLUS, INC. 0479 FIBERTECH TELECOM, INC. 0552 LAKE STATES COMMUNICATIONS, INC. 0480 VISTA GROUP INTERNATIONAL 0553 PARKWAY COMMUNICATIONS, INC. 0481 TELEDATA INTERNATIONAL, INC. 0554 CELLTOLL CORPORATION 0482 TELE-SYS, INC. 0555 WORLDCOM, INC. 0483 XPEDITE SYSTEMS, INC. 0556 U.S. LONG DISTANCE, INC. 0484 COMMUNITY LONG DISTANCE 0557 ABC TELECOM, INC. 0485 TELTRUST, INC. 0558 MIDCOM OF ARIZONA,INC. 0486 IRONTON LONG DISTANCE CO. 0560 TCI COMMUNICATIONS, INC. 0487 LCT LONG DISTANCE 0561 LCT LONG DISTANCE 0488 WORLDCOM, INC. 0562 LCI 0489 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 0563 LINKUSA CORPORATION 0490 PHOENIX COMMUNICATIONS GROUP, INC. 0564 LONG DISTANCE OHIO, INC. 0491 NORTHERN ARIZONA COMMUNICATIONS CORP. 0565 METRO ONE DIRECT 0492 COASTAL LONG DISTANCE SERVICES, INC. 0566 T-NET 0493 EXTELCOM dba EXPRESS TEL 0567 AMERICOM COMMUNICATIONS 0494 TRANSAMERICA COMMUNICATIONS, INC. 0568 US COMM. INC, dba SOUTHWEST L.D.N, INC. 0495 MID SEA dba MIDCOM COMMUNICATIONS, INC. 0569 WEST COAST TELECOMMUNICATIONS, INC. 0497 ECON-A-CALL INC. OF HAYS 0571 CHAUTAUQUA & ERIE COMMUNICATIONS, INC. 0498 NORLIGHT TELECOMMUNICATIONS, INC. 0572 PAC TEL PAGING, A PACIFIC TELESIS CO. 0499 NORLIGHT TELECOMMUNICATIONS, INC. 0573 AMERICAN TELECOMMUNICATIONS HOLDING LTD. 0500 FRONTIER COMMUNICATIONS OF THE GREAT LAKES, INC. 0574 U.S. CONNECT CORP. 0501 CARRIER CONCEPTS INTERNATIONAL CORP. 0576 U.S.FIBERLINE COMMUNICATIONS, INC. 0502 WORLDXCHANGE 0577 STRATEGIC ALLIANCES, INC 0503 FONE AMERICA, INC. 0578 TTI TELECOMMUNICATIONS, INC. 0504 AMERICAN LONG DISTANCE SERVICES 0579 ALIANT SYSTEMS, INC. 0505 CENTURY TELECOMMUNICATIONS, INC. 0580 BIXBY TELEPHONE LONG DISTANCE CO. 0506 FRIENDSHIP LONG DISTANCE 0581 BEN LOMAND COMMUNICATIONS, INC. 0507 FONOROLA 0582 WEST INTERACTIVE GROUP 0508 INTEX 0583 GST NET, INC. 0509 OLYMPIC TELECOMMUNICATIONS, INC. 0584 HEREFORD LONG DISTANCE SERVICES 0510 INNOVATIVE COMMUNICATIONS, INC. 0585 CUSTOM TELECONNECT, INC. 0511 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0586 DIGITAL NETWORK, INC. 0512 LOCATE TELEPHONE COMPANY 0587 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 0513 ICG dba INTERCONTINENTAL COMMS. LONG DISTANCE 0588 WORLDCOM, INC. 0514 DOMINICAN COMMUNICATIONS 0589 WORLDCOM, INC. 0515 FRONTIER COMMUNICATIONS INT'L, INC. 0590 OCOM CORPORATION 0516 FRONTIER COMMUNICATIONS INT'L, INC. 0591 INTEL COMMUNICATIONS 0518 TELECON COMMUNICATIONS CORPORATION 0593 TRANSACTION NETWORKS, INC. 0519 RSL COM U.S.A. 0594 EAGLECOM, INC. 0520 TEL-SPAN COMMUNICATIONS, INC. 0595 VARTEC TELECOM, INC. 0522 TRANSACTION NETWORK SERVICES 0596 U.S. ADVANTAGE LONG DISTANCE 0523 WORLDCOM, INC. 0597 PACIFIC GATEWAY EXCHANGE 0524 WHITMAN COLLEGE 0598 AMERICAN DISCOUNT TELECOMMUNICATIONS, INC. 0525 LEXINGTON TELEPHONE L.D. CO., INC. 0599 INTELCOM GROUP, INC. 0526 POKA-LAMBRO TELECOMMUNCATIONS, INC. 0601 NORTH AMERICAN INTELECOM 0527 INDEPENDENCE TELEPHONE CO. 0602 TELESERVE COMMUNICATIONS 0529 TELECOM WEST 0603 NATIONAL TELEPHONE COMMUNICATIONS 0530 CELLULAR LONG DISTANCE CO. (CUL) 0604 ECONOPHONE, INC. 0531 FARMERS LONG DISTANCE, INC. 0605 INTERCONTINENTAL TELCOM INC. 0532 EQUAL ACCESS OF WASHINGTON 0606 BIZ TEL LONG DISTANCE TELEPHONE CO. 0533 LONG DISTANCE DISCOUNT INC. 0609 TELEGLOBE USA, INC. 0534 TOUCH 1 COMMUNICATIONS 0610 PIONEER LONG DISTANCE 0535 WORLDCOM, INC. 0612 TOTAL WORLD TELECOM 0536 LONG DISTANCE MANAGEMENT 0613 CYBERNET INTERNATIONAL, INC. 0537 LCI INTERNATIONAL 0614 CINCINNATI BELL LONG DISTANCE 0538 WORLDCOM, INC. 0615 CAM-NET COMMUNICATIONS NETWORK, INC. 0539 ALLNET 0617 AMVOX 0540 AMERICAN LONG DISTANCE EXCHANGE, INC. 0618 RSL COM U.S.A. 0541 CONETCO COMMUNICATIONS CORPORATION 0619 COLORADO RIVER COMMUNICATIONS 0542 SEATTLE LONG DISTANCE NETWORK, INC. 0620 TELEHOP COMMUNICATIONS, INC. 0543 DIGITRAN CORP. 0621 MID TNC dba MIDCOM COMMUNICATIONS, INC. 0544 UNITED TELEPHONE CO. dba TELAMERICA L.D. 0622 BMG 0545 KEYSTONE TELECOM, INC. 0623 NTI 0546 WORLDCOM, INC. 0624 AMERICAN TELESOURCE INTERNATIONAL, INC. 0547 TELEFONICA LARGA DISTANCIA 0625 EDS 0548 CLEARTEL COMMUNICATIONS 0626 TEL-ONE 0549 NATIONAL BRANDS, INC. 0627 NATIONWIDE EMERGENCY TELECOMM. SYSTEM

26 TABLE 4 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0628 STAR TELEPHONE LONG DISTANCE 0701 CONTINENTAL LONG DISTANCE 0629 WORLDXCHANGE 0703 KEYSTONE TELECOMMUNICATIONS, INC. 0630 TELEGROUP 0704 FIBERNET TELECOMMUNICATIONS, INC. 0631 LONG DISTANCE OF MICHIGAN 0705 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0632 NATIONAL DATA CORPORATION 0706 ICON COMMUNICATIONS CORPORATION 0633 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0707 TELVUE CORPORATION 0634 BOTTOM LINE TELECOMMUNICATIONS, INC. 0708 LIGHT LINK INC/dba TAYLOR COMM. GRP. 0635 METRO TELEPHONE, INC. 0709 TEL AMERICA 0636 VARTEC TELECOM dba CLEAR CHOICE COMMUNICATIONS 0711 LAS VEGAS CONVENTION & VISITORS AUTHORITY 0637 FOX COMMUNICATIONS CORP. 0712 WCS/DIAL ONE 0638 NORTHWEST TELECOM, LTD. 0713 NORTHERN WISCONSIN L.D.S. 0639 NEP LONG DISTANCE CO. 0715 CALL U.S.INCORPORATED 0640 COMMUNICATIONS BROKERS, INC. 0716 NATIONWIDE COMMUNICATIONS, INC. 0641 TELECOMMUNICATIONS SERVICE CENTER, INC. 0717 NETWORK ONE, INC. 0642 R,D,&J COMMUNICATIONS MGMT. INC. 0718 WKP, INC. 0643 WINSTAR 0719 STARTEC, INC. 0644 ARCADA COMMUNICATIONS 0721 VOICE TECHNICAL CORPORATION 0645 AMERICAN COMMUNICATIONS TECHNOLOGY, INC. 0722 HI-PLAINS NTS COMMUNICATIONS 0646 CONTACT AMERICA, INC. 0723 CAPITAL TELECOMMUNICATIONS, INC. 0647 PIONEER LONG DISTANCE, INC. 0724 WORLDCOM, INC. 0648 MID MCND dba MIDCOM COMMUNICATIONS, INC. 0725 CONSOLIDATED NETWORK INC. 0649 WORKING ASSETS 0726 PROCOM, INC. 0650 EDS 0727 SWITCH 2000, INC. 0651 O.L.C. COMPANY 0728 PEOPLES COMMUNICATION, INC. 0652 BELL ATLANTIC COMMUNICATIONS, INC. 0729 TEL AMERICA 0653 SPECIALIZED TELECOMMUNICATIONS 0730 ATNT OF UNITED BUSINESS & COMM. SVCS. 0654 CINCINNATI BELL LONG DISTANCE 0731 TELESCAN, INC. 0655 T-NETIX, INC. 0732 AT&T COMMUNICATIONS 0656 NATIONAL NETWORK CORP. 0733 WORLDCOM, INC. 0657 NATIONAL TELECOM OF FLORIDA 0734 SCHERERS COMMUNICATIONS GROUP, INC. 0658 OCI 0735 FTI COMMUNICATIONS 0659 CTA COMM. INC. dba CTA LONG DISTANCE 0736 XNET, INC. 0660 CONNECT AMERICA COMMUNICATIONS, INC. 0737 WORLDCOM, INC. 0661 COASTAL TELEPHONE CO. 0738 WORLDCOM, INC. 0662 VALULINE LONG DISTANCE 0740 PUBLIC SWITCH CORP. 0663 AMERICAN TELCO, INC. 0741 WORLDCOM, INC. 0664 TOTAL TELEPHONE, INC. OF UTAH 0742 WORLDCOM, INC. 0665 LCI INTERNATIONAL 0743 PENINSULA LONG DISTANCE SERVICE, INC. 0666 SYSTEMS 1000 0744 ST. JOE COMMUNICATIONS, INC. 0667 COMMUNICATIONS INC.dba ECI 0745 TELEPHONE ELECTRONICS NETWORK, LTD. 0668 US FIBERCOM NETWORK, INC. 0746 NATIONAL TELEPHONE EXCHANGE (PA) 0669 TCA LONG DISTANCE 0748 COMMNET CELLULAR, INC. 0670 CAMERON LONG DISTANCE 0749 TELAMERICA COMMUNICATIONS, INC. 0671 DIGITAL TELECOMMUNICATIONS, INC. 0750 HI-RIM COMMUNICATIONS, INC. 0672 CENTURY COMMUNICATIONS 0751 WORLDCOM, INC. 0673 PRO TAS TELECOMMUNICATIONS 0752 EXCEL TELECOMMUNICATIONS, INC. 0674 VENSER, INC. 0753 WAUSAU LONG DISTANCE SERVICE 0675 COMMUNICATION SERVICES OF COLORADO 0754 ADVANTIS 0677 WATS/800, INC. 0755 ADVANTIS 0678 VALU-LINE OF KANSAS, INC. 0756 ZEROPLUS DIALING, INC. 0679 FEIST LONG DISTANCE 0757 PACE LONG DISTANCE SERVICE 0680 MIDWEST TELEPHONE SERVICE, INC. 0758 PACE LONG DISTANCE SERVICE 0681 HUNTLEIGH TELECOMM. GROUP, INC. 0759 TELENET COMM. CORP. [SPRINT] 0682 AMERICALL COMMUNICATIONS 0760 ALTERNATIVE LONG DISTANCE, INC. 0683 WORLDCOM, INC. 0762 STATE OF CALIFORNIA - CALNET 0684 LCT LONG DISTANCE 0763 SOUTHERN NEW ENGLAND TELEPHONE (SNET) 0685 INTL.800 TELECOM dba TELECALL LONG DIST. 0764 NETWORK PLUS 0686 AT&T CANADA LONG DISTANCE SERVICES CO. 0765 NETWORK LONG DISTANCE 0687 NTS COMMUNICATIONS INC. 0766 YAVAPAI TELEPHONE EXCHANGE 0688 MUSTANG TELE-COMMUNICATIONS, INC. 0767 PAYLINE SYSTEMS, INC. 0689 TELEMANAGEMENT CONSULTANTS CORPORATION 0769 OMNI COMMUNICATIONS, INC. 0690 CORPORATE TELEMANAGEMENT GROUP 0770 SOURIS RIVER TELECOMMUNICATIONS COMPANY 0691 HAMILTON TELECOMMUNICATIONS 0771 TELECOM*USA [MCI] 0693 DELUXE DATA SYSTEMS 0772 ADVANTIS 0694 FRONTIER LONG DISTANCE OF AMERICA 0773 SPRINT CANADA, INC. 0695 OPTICALL COMMUNICATIONS SERVICES 0774 CITYNET COMMUNICATIONS, INC. 0696 INTEGRATED SYSTEMS CORPORATION 0775 PENCOR SERVICES dba PALMERTON LONG DIST. 0697 MATRIX TELECOM 0776 PRIORITY ONE LONG DISTANCE 0698 NYNEX - CORRIDOR 0777 SPRINT 0699 US TELESERVICES, INC. 0778 SHOW-ME LONG DISTANCE, INC. 0700 TEL AMERICA 0779 AUTUMN COMMUNICATIONS, INC.

27 TABLE 4 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0780 MATRIX TELECOM 0866 ALASCOM, INC. 0781 WXL COMMUNICATIONS, LTD. 0867 BITTEL TELECOMMUNICATIONS CORPORATION 0782 WORLDCOM, INC. 0868 WORLDCOM, INC. 0783 MANITOBA TELEPHONE SYSTEM 0869 AT&T CANADA LONG DISTANCE SERVICES CO. 0784 SUNSHINE TELEPHONE, INC. dba SUNTEL 0870 BLUE RIDGE TELEPHONE 0785 NETWORK TECHNOLOGIES INC. 0871 NETWORK BILLING AND COLLECTIONS, INC. 0786 WORLDCOM, INC. 0872 SPRINT 0787 STAR TEL OF ABILENE 0873 ONE STAR LONG DISTANCE 0788 C-COM 0874 WORLDCOM, INC. 0789 WORLDCOM, INC. 0876 TELECOM*USA [MCI] 0790 AFFILIATED TELECOM SVCS. INC. 0877 WILLAMETTE VALLEY TELECOM 0791 B.R. COMMUNICATIONS 0878 VALLEY STAR-TEL 0792 SOUTHTEL CORPORATION 0879 US COMMUNICATIONS,INC. 0793 SOUTHWEST TEXAS COMMUNICATIONS, INC. 0880 ONE CALL COMMUNICATIONS 0794 AMERITEL 0881 COASTAL TELEPHONE CO. 0795 CAPROCK TELEMANAGEMENT 0882 HOME OWNERS L.D. dba HOLD BILLING SVCS. 0796 INDIANTOWN TELEPHONE LONG DISTANCE 0883 TEASE COMMUNICATIONS 0797 WORLDCOM, INC. 0884 WORLDCOM, INC. 0798 THE PAY TELEPHONE COMPANY 0885 THE COMMUNIGROUP OF KC 0799 LONG DISTANCE INTERNATIONAL 0886 GUIDE NETWORK INTERNATIONAL 0800 WORLDCOM, INC. 0887 TELEMANAGEMENT CONSULTANTS CORPORATION 0801 WORLDCOM, INC. 0888 MCI 0802 ELECTRIC LIGHTWAVE, INC. 0889 VALU-LINE OF ST. JOSEPH 0803 LOW COUNTRY CARRIER dba HARGRAY L.D. CO. 0890 NORTH COUNTY COMMUNICATIONS CORPORATION 0805 OCI 0891 OPERATOR SERVICE COMPANY 0806 NACT 0892 SOUND COMMUNICATIONS WEST 0807 SOUTH CAROLINA NETWORK, INC. 0893 CONCORD TELEPHONE LONG DISTANCE (CT LONG DISTANCE) 0808 EASTERN TELECOM dba INTERQUEST 0895 WORLDCOM, INC. 0809 ASIA INTERNATIONAL SERVICES CORP. (AIC) 0896 THE REAL PUBLIC TELEPHONE COMPANY, INC. 0810 MIDCOM COMMUNICATIONS, INC. 0897 ITC NETWORK OF UTAH 0811 VARTEC TELECOM, INC. 0898 MCI 0813 AMERICAN TELECOMMUNICATIONS ENTERPRISES 0899 TELEPHONE EXPRESS 0814 DISCOUNT AMERICA 0900 MCI 0816 CONSOLIDATED TECHNOLOGIES, INC (CTI) 0902 COAST TO COAST TELECOMMUNICATIONS 0817 VALUE-ADDED COMMUNICATIONS 0903 VRS BILLING SYSTEMS, INC. 0818 VARTEC TELECOM, INC. 0904 INTERLINK TELECOMMUNICATIONS 0819 CABLEVISION LIGHTPATH, INC. 0905 PIZZA HUT, INC. 0820 G.E. EXCHANGE 0907 UNI-TEL OF FARMINGTON 0822 ATHENA INTERNATIONAL L.L.C. 0908 NTC, INC. 0823 UNITED BANK OF DENVER 0909 CHADWICK TELEPHONE 0824 WORLDCOM, INC. 0910 WORLDCOM, INC. 0826 TELECOM*USA [MCI] 0911 WORLDCOM, INC. 0827 MVP COMMUNICATIONS, INC. 0912 MRC TELECOMMUNICATIONS, INC. 0828 EXCEL TELECOMMUNICATIONS, INC. 0914 CENTURY TELECOMMUNICATIONS, INC. 0829 MULTIMEDIA TELEPHONE SERVICE, INC. 0915 TELE TECH, INC. 0830 PUBLIC SERVICE COMPANY OF NM 0917 PAY TEL COMMUNICATIONS, INC. 0831 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0918 WORLDCOM, INC. 0832 TELECOM*USA [MCI] 0919 TEL NET,INC. 0833 BUSINESS TELECOM, INC. 0920 HONGKONG TELECOM (CANADA) 0834 CTS TELCOM OF FLORIDA 0921 WORLDCOM, INC. 0835 TELECOM*USA [MCI] 0922 FEB CORPORATION 0836 BRANSON TELEPHONE 0923 THRIFTY CALL, INC. 0837 NORLIGHT TELECOMMUNICATIONS, INC. 0924 XTEL 0838 PHONETEL TECHNOLOGIES, INC. 0925 KELHORN COMMUNICATIONS, INC. 0839 CABLE & WIRELESS COMMUNICATIONS, INC. 0926 LA CONEXION FAMILIAR, INC. 0840 WORLD PASS COMMUNICATIONS CORP. 0927 ADVANCED RADIO COMMUNICATIONS SYSTEMS 0841 FIRST FINANCIAL MANAGEMENT CORP. 0928 LOW COUNTRY CARRIER dba HARGRAY L.D. CO. 0842 WORLD ACCESS COMMUNICATIONS CORP. (WACC) 0929 STENOCALL 0843 ADVANCED TELECOM SYSTEMS 0930 PILGRIM TELEPHONE INC. 0844 PREFERRED TELECOM, INC. 0931 L.D. NETWORK, INC. 0845 TELECABLE CORPORATION 0932 MIDTEL LONG DISTANCE MINOT 0846 WORLDCOM, INC. 0933 NORTH AMERICAN COMMUNICATIONS, INC. 0847 VIP CONNECTIONS, INC. 0934 COMCENTRAL dba SOUTHNET SERVICES, INC. 0848 TRESCOM U.S.A., INC. 0935 FIRST CHOICE LONG DISTANCE, INC. 0849 TALTON TELECOMMUNICATIONS CORP. 0936 INTERAMERICAN TELEPHONE CO. (ITC) 0851 UTEL-CALL 0937 ACCESS LONG DISTANCE 0852 TELECOM*USA [MCI] 0938 WESTCOM, INC. (WESTERN TELECOM, INC.) 0853 DIGITAL NETWORK, INC. 0939 VISTA-UNITED TELECOMMUNICATIONS 0855 UNION TELEPHONE COMPANY 0940 NEW ENGLAND TELEDISCOUNT SYSTEMS, INC. 0856 CFW NETWORK, INC. 0941 U.S. FIBERCOM 0857 TELECOM*USA [MCI] 0942 QCC, INC. 0858 AT&T CANADA LONG DISTANCE SERVICES CO. 0943 INTERNATIONAL CELLULAR, INC. (ICI) 0859 VALU-LINE OF LONGVIEW, INC. 0945 NEW TIMES, INC. 0860 METRO TELECOMM.SVCS.,INC. dba METROCOMM 0946 WESTINGHOUSE ELECTRIC CORPORATION 0861 TELCO HOLDINGS, INC. 0947 JSM TELE-PAGE 0862 WORLDCOM, INC. 0948 SWITCHED SERVICE COMMUNICATIONS 0864 T-ONE COMMUNICATIONS CO. 0949 COMMONWEALTH OF PENNSYLVANIA 0865 EXPRESS COMMUNICATIONS, INC. 0950 DEPARTMENT OF THE TREASURY, IRS

28 TABLE 4 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0951 WORLDCOM, INC. 5037 FIBERNET, INC. 0952 ECONOCOM LONG DISTANCE 5039 FREEDOM TELECOMMUNICATIONS INC. 0953 WORLDCOM, INC. 5040 BROWN SERVICE COMPANY 0954 PRIME TIME COMMUNICATIONS 5041 NET-TEL CORPORATION 0955 UNITED COMMUNICATIONS, INC. 5042 FAR POINT 0956 CITY TELECOM INC. (CITI) 5043 ANANDA WORLD BROTHERHOOD VILLAGE 0957 WESTERN TELECOMMUNICATION, INC. (WTCI) 5044 NORTH AMERICAN TELEPHONE NETWORK, INC. 0958 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 5045 KLP, INC. dba CALL-AMERICA 0959 MID-PLAINS TELEPHONE, INC. 5046 SPRINT METROPOLITAN NETWORK, INC. 0960 LONDON TELECOM 5047 HLC INTERNET 0961 TELEPHONE SYSTEMS OF GEORGIA 5048 ACSI (AMERICAN COMMUNICATIONS SERVICES, INC.) 0962 GULF LONG DISTANCE, INC. 5049 ATLANTIC CELLULAR CO., L.P. dba ATLANTIC LONG DISTANCE 0963 CAPITAL TELECOMMUNICATIONS, INC. 5050 BELL ATLANTIC COMMUNICATIONS, INC. 0964 INTERSTATE TELECOM SVCS. INC. 5051 INTER-TEL NETSOLUTIONS 0965 HOGAN COMMUNICATIONS 5052 FIVE AREA LONG DISTANCE 0966 AUC COMMUNICATIONS 5053 DEKALB TELEPHONE COOPERATIVE INC. 0967 POLAR COMMUNICATIONS CORP. 5054 WILTON LONG DISTANCE 0968 4JV ENTERPRISES, INC. 5057 WEBSTER-CALHOUN LONG DISTANCE (WEB-CAL LD) 0969 WORLDCOM, INC. 5060 LDCC, INC. 0971 QUEST TELECOMMUNICATIONS, INC. 5061 INFO-TEL COMMUNICATIONS INC. 0972 SPECTRANET, INC. 5062 XCOM TECHNOLOGIES 0973 UNIVERSAL TELEPHONE & TELEGRAPH 5063 COMINEX 0974 CARIBSAT TELECOMMUNICATIONS, INC. 5067 BRAZOS LONG DISTANCE 0975 AMERITEL LONG DISTANCE, INC. 5070 ASSOCIATED TELEPHONE DESIGN, INC. 0976 PREFERRED NETWORK 5071 AXCES, INC. 0977 TELEPHONE COMMUNICATIONS CORPORATION 5072 PACIFIC BELL 0978 WESTEL TELECOMMUNICATIONS, LTD. 5079 PREFERRED CARRIER SERVICES (PCS) 0979 VORTEL COMMUNICATIONS, INC. 5100 THE CORCORAN GROUP 0981 WARWICK VALLEY LONG DISTANCE CO., INC. 5101 INTERCONTINENTAL COMMUNICATIONS CORP. 0983 STAR TEL OF VICTORIA, INC. 5102 TELENATIONAL COMMUNICATIONS 0984 STAR TEL TRANSMISSION CO., INC. 5103 RESERVE LONG DISTANCE 0985 TELECORP INTERNATIONAL 5104 PAYPHONE CONSULTANTS, INC. (PCI) 0986 MCI 5105 DISCOUNT PLUS 0987 WORLDCOM, INC. 5106 THE V.I.P. PHONE CLUB, INC. 0988 AT&T EASYLINK SERVICES 5107 KANOKLA COMM.S, INC.dba KANOKLA LONGDISTANCE 0989 KRB TELECOM 5108 ASSOCIATED NETWORK PARTNERS, INC. (ANPI) 0991 ACCESS LONG DISTANCE 5109 LIGHTCOM INTERNATIONAL 0993 SOUTHWEST UNITED COMMUNICATION,INC 5110 NYNEX 0994 TOUCH AMERICA, INC. 5111 TELEPHONE ECONOMY LEAGUE 0995 WORLDCOM, INC. 5112 TELSCAPE INTERNATIONAL, INC. 0996 MIDCO COMMUNICATIONS 5113 RESIDENTIAL COMMUNICATIONS NETWORK 0997 GAS COMPANY OF NEW MEXICO 5114 ARAMTEL 0998 THE COMMUNIGROUP OF KC 5115 BROOKS FIBER COMMUNICATIONS 0999 WORLDCOM, INC. 5116 SEQUEL COMMUNICATIONS, INC. 5001 MH COMMUNICATIONS, INC. 5117 ADAMS TELSYSTEMS, INC. 5004 RAPID LINK, U.S.A., INC. 5118 GREAT LAKES TELECOMMUNICATIONS (GLTC) 5005 U S TELESERVICES, INC. 5119 NEXTLINK 5006 BAY AREA TELEPORT 5120 EASTERN TELELOGIC CORPORATION 5007 EGYPTIAN COMMUNICATIONS SERVICES, INC. 5121 CCT (CALIFORNIA CATALOG AND TECHNOLOGY) 5008 US ONE COMMUNICATIONS CORP. 5122 EQUALNET CORPORATION 5009 EQUALITY PLUS TELECOMMUNICATIONS 5123 U S WEST COMMUNICATIONS 5010 PRE-PAY U.S.A. INC. 5124 BELLSOUTH TELECOMMUNICATIONS, INC. 5011 JONES COMMUNICATIONS, INC. 5125 TELECARE, INC. 5012 ARRIVA COMMUNICATIONS, INC. 5126 COMSAT 5013 LANSER TELECOM, INC. 5127 CHOICE 1 COMMUNICATIONS 5014 THE FURST GROUP, INC. 5128 CALL FOR LESS 5015 GATEWAY COMMUNICATIONS, LTD. 5129 CARIBE COMMUNICATIONS, INC. 5016 KTNT COMMUNICATIONS 5130 ELLTEL WIRELESS 5017 AMADEUS COMMUNICATIONS 5131 PACIFIC TELECOM, INC. (PTI) 5018 BRAHAMS COMMUNICATIONS 5132 BRINDLEE MOUNTAIN TELEPHONE COMPANY 5019 DVORAK 5133 CBG, INC. 5020 FRIENDLY VOICE NETWORK 5134 ATLAS COMMUNICATIONS, LTD. 5021 HERITAGE COMMUNICATIONS 5135 IXC LONG DISTANCE, INC. (IXC LD) 5022 WEEKS COMMUNICATIONS, INC. 5136 I DON'T KNOW 5023 SELECT COMMUNICATIONS 5137 IT DOESN'T MATTER 5024 INTERSTATE OPERATORS, INC. 5138 WHO EVER 5025 RYAN COMMUNICATIONS, INC. 5139 BAY TNT NETWORK 5026 NATIONAL FIBER COM, INC. 5140 ANYONE IS OKAY 5027 AMERICAN FIBER COM, INC. 5145 COMLITE, INC. 5028 AMERICAN FIBERNET, INC. 5148 SOUTH SLOPE COOPERATIVE TELEPHONE CO., INC. 5029 J B OPERATORS, INC. 5151 LOTEL CO. INC. 5030 MOUNTAINVIEW COMMUNICATIONS, INC. 5165 TELEPHONE ASSOCIATES 5031 INTERNATIONAL OPERATORS, INC. 5168 NORTH AMERICAN COMMUNICATIONS CONTROL, INC. 5032 MORNINGSTAR COMMUNICATIONS, INC. 5172 DMI COMMUNICATIONS GROUP, INC. 5033 REA LONG DISTANCE 5173 MID-MAINE TELPLUS dba MID-MAINE LONG DISTANCE 5034 SIGNATURE NETWORK SERVICE 5175 WINSTAR 5035 ADVANCED TELECOM, INC. 5177 ATLAS EQUITY, INC. dba PERFORMANCE TELECOM 5036 COMMONWEALTH TELECOM, INC. 5200 TREAS RESOURCES INTL. CORP. dba TRI COMMS. NETWORK

29 TABLE 4 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 5202 HART COMMUNICATIONS, INC. dba HART TEL. LONG DISTANCE 5423 CITIZENS LONG DISTANCE CO. 5203 WOODBURY TELEPHONE COMPANY 5426 HIGHLAND COMMUNICATIONS CORP. 5212 CABLE & WIRELESS, INC. 5430 URSUS TELECOM CORP. 5213 CABLE & WIRELESS, INC. 5431 AGT LIMITED 5214 CABLE & WIRELESS, INC. 5432 G.E. EXCHANGE 5221 CORRECTIONAL COMMUNICATIONS CORPORATION, INC. 5433 PRO-LIFE NETWORK, L.L.C. 5223 STAR TELECOMMUNICATIONS, INC. 5434 ARKLA LONG DISTANCE ADVANTAGE 5225 CITIZENS TELEPHONE COOPERATIVE - IXC 5436 GEOTEL COMMUNICATION SERVICES, INC. 5226 BC TEL 5443 GLOBALCOM, INC. 5227 TCAST COMMUNICATIONS, INC. 5444 I DON'T CARE 5228 ATLAS COMMUNICATIONS & TELEPHONE C.D., INC. 5445 CONNECTICUT TELEPHONE & COMM. SYSTEMS, INC. 5229 MOUNTAIN WEST LONG DISTANCE 5448 GTE INTERNAL TELECOMMUNICATION SERVICES 5230 US LEC OF NORTH CAROLINA, L.L.C. 5450 UNICOM, INC. 5233 SOUTHWESTERN BELL TELEPHONE 5453 GROUP LONG DISTANCE, INC. 5234 CCI PR RSA, INC. 5454 BEV-R ENTERPRISES INC, T/A TOUCHTONE COMMS. 5235 ONE STOP COMMUNICATIONS 5455 MERIDIAN TELECOM CORPORATION 5244 ATHENA INTERNATIONAL L.L.C. 5456 CALTECH INTERNATIONAL TELECOM CORPORATION 5248 AMERICAN INTERNATIONAL TELEPHONE 5463 ACOMM, INC. 5249 GTE TELEPHONE OPERATIONS 5465 PACIFIC BELL 5250 CRYSTAL COMMUNICATIONS, INC. 5468 INTERACTIVE NETWORK SYSTEM, INC. (INET) 5252 TRI-COUNTY LONG DISTANCE 5473 ACC LONG DISTANCE CORPORATION 5253 ALLTEL LONG DISTANCE 5475 AMERITECH 5254 WORLD WIDE CONNECT, INC. 5476 GRANITE STATE LONG DISTANCE 5255 LEAST COST ROUTING dba LONG DISTANCE CHARGES 5478 GST PACWEST TELECOM, INC. 5256 TRANSACT DATA SERVICES, INC. 5482 HTC COMMUNICATIONS CO. 5257 FARMERS MUTUAL COOPERATIVE TELEPHONE CO. 5483 GTE CARD SERVICES INC. dba GTE LONG DISTANCE 5258 TELCOM NETWORK, INC. (TNI) 5484 HORIZON TELECOMMUNICATIONS, INC. 5259 FARMERS MUTUAL TELEPHONE CO. 5485 GLENNERIC COMMUNICATIONS, INC. 5260 CITIZENS MUTUAL TELEPHONE COMPANY 5487 INTEGRATED TELESERVICES, INC. 5261 BASCOM LONG DISTANCE 5500 ESS VENTURES, INC. 5262 CST COMMUNICATIONS, INC. 5501 SATELLITE COMMUNICATIONS SYSTEMS, INC. 5263 ACCESS/ON MULTIMEDIA, INC. 5510 UNIVERSAL TELECOM, INC. 5264 ACCESS WORLD COMMUNICATION 5511 CIMCO COMMUNICATIONS 5265 DISCOUNT LONG DISTANCE 5512 CITIZENS TELECOM 5266 WORLD LINK, INC. 5515 CELLNET COMMUNICATIONS CORPORATION 5267 CMS COMMUNICATIONS 5519 INCLINE COMMUNICATIONS, INC. 5268 JUSTICE LONG DISTANCE, INC. 5520 HOME LONG DISTANCE, INC. 5277 WILTON TELEPHONE COMPANY 5522 TELAPEX LONG DISTANCE, INC. 5279 EASY CELLULAR 5523 VALUE TEL 5282 CHIBARDUN TELEPHONE COOPERATIVE, INC. 5524 LEGAL AID SOCIETY OF ORANGE COUNTY 5284 CENTRAL TELECOM, INC. 5532 LACKAWAXEN LONG DISTANCE CO. 5288 MICHIGAN INDEPENDENT NETWORK, INC. 5535 LAKEDALE LINK, INC. 5292 ALL WEST/WORLD CONNECT 5536 PRTC COMPETITIVE SVCS. LDC 5296 RGDATA, INC. 5548 LAUREL HIGHLAND LONG DISTANCE CO. 5297 SIMPLY LONG DISTANCE, INC. (SLD) 5551 BRITTAN COMMUNICATIONS INTERNATIONAL CORP. (BCI) 5300 CINCINNATI BELL TELEPHONE 5553 LAKEFIELD COMMUNICATIONS, INC. 5303 CANADIAN TIRE ACCEPTANCE LTD. 5555 TELECOM ONE 5310 NORTHERN TELEPHONE & DATA (NTF) 5556 BAY SPRINGS LONG DISTANCE 5316 DIRECT NET TELECOMMUNICATIONS 5559 COOPERATIVE COMMUNICATIONS, INC. 5317 TRANS-WORLD TELECOM 5566 M.T. CORPORATION 5318 INTERNATIONAL TELECOMMUNICATION CORP. 5571 CHAUTAUQUA & ERIE COMMUNICATIONS, INC. 5319 5 STAR TELECOM 5577 NETWORK CARRIER SERVICES 5320 IPC IXNET 5588 GLOBAL RATE PROCESSING 5321 LDC TELECOMMUNICATIONS, INC. 5599 PHONE MICHIGAN 5322 BC TEL 5600 PHOENIX NETWORK 5323 CHARITON VALLEY LONG DISTANCE CORPORATION 5606 AMERITECH 5324 EASTGATE COMMUNICATIONS, INC. (ECI) 5608 THE LONG DISTANCE PARTNERSHIP, L.P. 5326 FBN AMERICA, INC. 5617 TELECOMMUNICATIONS CORPORATION OF AMERICA (TCA) 5327 STATE TELEPHONE LONG DISTANCE 5632 PRIME LINE COMMS. dba PRIME LINK LONG DISTANCE, INC. 5328 BERKSHIRE LONG DISTANCE 5633 MADISON NETWORK SYSTEMS, INC. 5329 MTC LONG DISTANCE 5635 NORTH DAKOTA LONG DISTANCE 5331 HEART OF IOWA COMMUNICATIONS, INC. 5646 TELEBERMUDA INTERNATIONAL LIMITED (TBI) 5332 NETWORK RECOVERY SERVICES, INC. 5653 NLD, USA 5333 PARTNER COMMUNICATIONS GROUP 5655 WEST RIVER LONG DISTANCE 5334 LONG DISTANCE DIRECT, INC. 5656 TOUCH TONE AMERICA, INC. 5335 DELTATEL, INC. 5657 CELLULAR 29 PLUS 5353 ATU LONG DISTANCE, INC. 5665 FRESH START COMMUNICATIONS - FSC 5357 CL TEL LONG DISTANCE, INC. 5672 WESTINGHOUSE ELECTRIC CORPORATION 5367 KINNET 5673 WESTINGHOUSE ELECTRIC CORPORATION 5368 AIR PULSE, INC. 5675 CASCADE TELEPHONE COMPANY 5375 NORTHWESTERN INDIANA TELEPHONE CO. 5678 FORT BEND LONG DISTANCE 5377 PAYLESS LONG DISTANCE, LTD 5679 NORTH PITTSBURGH TELEPHONE COMPANY 5380 AIR TOUCH CELLULAR 5680 NETWORK ENHANCED TECHNOLOGIES, INC. (NET) 5381 HEALTH LIABILITY MANAGEMENT 5681 STATE OF CA. HEALTH & WELFARE AGENCY DATA CENTER 5383 ETEX LONG DISTANCE dba ETEX CELLULAR CO., INC. 5682 METROTIME COMMUNICATIONS 5385 NATIONAL TELCOM MANAGEMENT INC 5683 PRIMETEL COMMUNICATIONS, INC. 5393 INTERMEDIA COMMUNICATIONS, INC. 5688 AMERICATEL 5422 HCC TELEMANAGEMENT 5689 MTX COMMUNICATIONS

30 TABLE 4 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 5692 TACONIC TELCOM CORP. 5929 KNOX SERVICE GROUP 5697 EMPIRE COMMUNICATIONS SERVICES CORPORATION 5930 EXCO LONG DISTANCE 5698 INTERNATIONAL TELECOM, INC. (ITI) 5931 APPLEGATE LONG DISTANCE 5711 KING SALMON COMMUNICATIONS, INC. 5933 ZIMMER WAY 5712 DATACOMM INTERNATIONAL CO. LTD. 5934 MUSTANG OPERATORS 5714 GLOBAL TONE COMMUNICATIONS, INC. 5935 RIVERBEND COMMUNICATIONS 5715 CHEQUAMEGON TELEPHONE COOPERATIVE, INC. 5936 POLLOCK LD SERVICE 5722 SOUTHWESTERN BELL TELEPHONE 5937 LD BRUCE 5728 THRIF-TCOMM 5938 WEYMOUTH SERVICE 5737 DOBSON WIRELESS, INC. 5939 FOREST PINE TELCOM 5738 SOUTHEAST TELEPHONE, LTD. 5940 FLEMING LONG DISTANCE 5739 BROADCAST MEDIA SATELLITE 5941 KBTN 5753 SHERBURNE LONG DISTANCE, INC. 5942 CHRISTINE LD SERVICE 5756 GST TELECOM, INC. 5943 ALERT OPERATORS 5757 800 & LONG DISTANCE SERVICES 5946 WABASH INDEPENDENT NETWORKS 5758 PAYLESS TELECOM, INC. 5953 BLUE MOUNTAIN CELLULAR (BMCT) dba CELLULARONE 5759 VALULINE LONG DISTANCE 5957 UNI DIAL 5762 MIKROTEC INTERNET SERVICES, INC. 5958 STARGATE COMMUNICATIONS, INC. 5765 MARNE & ELK HORN TELEPHONE CO. 5959 OGDEN TELEPHONE LONG DISTANCE 5772 FTI COMMUNICATIONS 5969 U.S. CELLULAR CORP. 5775 UNION TELEPHONE CO. 5970 INFONET LONG DISTANCE, L.L.C 5777 APOLLO TELECOM 5971 C-NET COMMUNICATIONS 5784 MARIANNA-SCENERY HILL LONG DISTANCE CO. 5972 U.S. ROBOTICS 5787 COOPERATIVE TELEPHONE COMPANY 5973 C R TELCO, INC.,dba CAP ROCK TELECOMM. 5788 PRESTON ENTERPRISE, INC. 5976 CONCORD TELEPHONE COMPANY, INC. 5789 QUESTAR INFOCOMM INCORPORATED 5978 WORLD TELECOMMUNICATIONS SERVICES, INC. 5792 SOUTHWESTERN BELL TELEPHONE 5980 OVERLOOK COMMUNICATIONS INTERNATIONAL 5795 CAPROCK TELEMANAGEMENT 5981 TRANS GLOBAL COMMUNICATIONS, INC. 5797 NTI TELECOM, INC. 5982 U.S. AMERITEL 5798 BRAZORIA LONG DISTANCE CO. 5983 ONEONTA TELEPHONE CO., INC. 5800 NORTHEAST TELEPHONE LONG DISTANCE, INC. 5993 CENTRAL TEXAS COMMUNICATIONS, INC. 5810 ATI TELECOM, INC. 5999 ZENEX LONG DISTANCE, INC. 5820 CELLCOM 6001 DHC, INC. 5821 CRYSTAL COMMUNICATIONS 6010 MFS INTELENET, INC. 5826 VANCOUVER TELEPHONE COMPANY LTD. 6011 MFS INTELENET, INC. 5830 GENESIS COMMUNICATIONS INT'L, INC. 6012 MFS INTELENET, INC. 5831 D.H. COMMUNICATIONS 6034 PANTEL COMMUNICATIONS 5835 FONETEL 6057 PALMER MUTUAL TELEPHONE CO. 5839 NPS, INC. 6060 TELEC, INC. 5840 HEBRON CORPORATION 6088 COLLECTIVE COMMUNICATION SERVICES, INC. 5841 VOICE TRACK CORPORATION 6100 BT TELECOM, INC. 5845 USA GLOBAL LINK 6101 HOST NETWORK, INC. 5847 PUBLIC SERVICE CELLULAR, INC. 6102 PCI 5852 MAT-TELL COMMUNICATIONS, INC. 6105 WINNEBAGO COOPERATIVE TELEPHONE ASSOCIATION (WCTA) 5853 VOLCANO LONG DISTANCE 6108 HANCOCK RURAL TELEPHONE CORPORATION 5858 SIERRA TELEPHONE LONG DISTANCE 6110 BELLSOUTH TELECOMMUNICATIONS, INC. 5864 TELEPACIFIC NETWORK, INC. 6111 TELEPOOL NETWORK, INC. 5869 T-NETIX, INC. 6123 AMERITECH 5872 NATIONWIDE PAGING, INC. 6150 THE SAN DIEGO TELEPHONE COMPANY 5874 TELECARRIER SERVICES, INC. 6161 WATS INTERNATIONAL CORPORATION 5876 CCI PR RSA, INC. 6205 BUSINESS PHONES 5877 U.S. SOUTH COMMUNICATIONS, INC. 6222 CABLE & WIRELESS BERMUDA 5878 US VOICE TELEMANAGEMENT, INC. 6224 GTE CARD SERVICES INC. dba GTE LONG DISTANCE 5880 CYBERNET COMMUNICATIONS 6225 IOWA NETWORK SERVICES, INC. 5882 THE TELEPHONE CONNECTION OF L.A., INC. 6232 NORTH AMERICAN DIGICOM CORPORATION 5885 VIATEL, INC. 6253 THE BENTLEYVILLE LONG DISTANCE COMPANY 5888 SUMMIT TELESERVICES 6255 INT'L. SERVICES NETWORK, INC. dba ISN COMMUNICATIONS 5892 TIME WARNER 6264 MIIC dba POLARIS TELCOM 5894 OKLAHOMA LONG DISTANCE 6265 DIGI COM 5895 METROTEL COMMUNICATIONS 6268 CADETELCO, LLC dba ALL STATES TELEPHONE CO. 5910 COMMUNICATIONS TECHNOLOGY GROUP 6269 COX COMMUNICATIONS, INC. 5911 OLD HOME OPERATOR 6282 MARQUETTE-ADAMS TELEPHONE COOPERATIVE, INC. 5912 OLD LAREDO SERVICE 6286 ADVANCED TELECOMMUNICATIONS NETWORK, INC 5913 SANDELL OPERATOR SERVICE 6288 MICROVOICE APPLICATIONS, INC. 5914 SUNRISE OPERATOR 6301 K&S INTERNATIONAL COMMUNICATIONS, INC. 5915 VERA LONG DISTANCE 6322 EARTHCALL COMMUNICATIONS CORPORATION 5916 WORLD WINDOW 6324 DIGI-CELL, INC. 5917 HICKORY GROVE GROUP 6325 NORTH STATE TELEPHONE LONG DISTANCE CO. 5918 WISTERIA LD SERVICE 6332 NORTHEAST FLORIDA LONG DISTANCE COMPANY, INC. 5919 ANDRIL SERVICE GROUP 6333 TELEGLOBE USA, INC. 5920 CALLUM LONG DISTANCE 6339 PREMIER COMMUNICATIONS, INC. 5922 BRYANT SERVICE 6356 MEGAWATS 5923 U SPEAK LONG DISTANCE 6360 360Ø LONG DISTANCE CO., INC. 5924 VIVA TEL LONG DISTANCE 6362 FOCAL COMMUNICATIONS CORP. 5925 HONE COMMUNICATIONS 6381 HICKORY TELEPHONE COMPANY 5926 MCV TELCOM 6383 PLANET COMMUNICATIONS GROUP 5927 BARTS LD GROUP 6384 EASTERN TELECOMMUNICATIONS INC. (ETI) 5928 MINH LONG DISTANCE 6398 NEXTEL COMMUNICATIONS

31 TABLE 4 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY CIC CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO 6400 BETHANY TELECOM 6401 COMTEL TECH 6402 SISK COMMUNICATIONS 6403 REGENCY LONG DISTANCE 6404 FASTLINE COMMUNICATION NETWORK 6405 IACT 6406 INDICOM 6407 GALA COMMUNICATIONS 6408 FAIRVIEW TELECOM 6409 DIAMOND COMMUNICATIONS 6410 ST. PIERRE COMMUNICATION NETWORK 6411 LONG DISTANCE ASSISTANCE 6412 FUTURE CONNECT 6413 SAVEMORE NETWORK 6414 TELENET COMMUNICATIONS 6419 LEWIS COMMUNICATIONS 6420 RKS COMMUNICATIONS 6423 INTER DIVISION COMM 6424 HELMSCO, INC. dba. CENTRAL LINK COMM. 6437 IDS LONG DISTANCE, INC. 6444 TELEHUB COMMUNICATIONS CORPORATION 6464 ORLANDO DIGITAL TELEPHONE CORP. 6483 IT&E OVERSEAS, INC. 6484 HYPERION TELECOMMUNICATIONS INC. 6486 CENTURION INTELNET 6488 ACCESS TELECOM 6500 BELL ATLANTIC NETWORK SERVICES, INC. 6543 DISCOUNT NETWORK SERVICES, INC. (DNS) 6565 SWISHER TELEPHONE COMPANY 6600 LDM SYSTEMS, INC. 6611 TRINET 6634 CANNON COMMUNICATIONS CORPORATION 6644 PYMATUNING INDEPENDENT TELEPHONE COMPANY 6665 NEW NORTH TELECOMMUNICATIONS, INC. 6666 S.F.C. ENTERPRISES 6673 CURRY COMMUNICATIONS, INC. 6674 MANAGED NETWORK SYSTEMS, INC. 6678 XTRACOM, INC. 6682 MICRONESIAN TELECOMMUNICATIONS CORPORATION (MTC) 6699 WCTC ALL DISTANCE 6715 CITIZENS TELEPHONE COOPERATIVE, INC. 6722 PBC LONG DISTANCE 6738 SOUTHEASTERN NETWORK SERVICES 6746 THE PHONE COMPANY 6753 CORPORATE SERVICES TELCOM 6763 SOUTHERN NEW ENGLAND TELEPHONE (SNET) 6767 PREMIERE COMMUNICATIONS 6777 CABLE PLUS dba TELEPHONE PLUS 6778 SPRING VALLEY TELEPHONE LONG DISTANCE 6782 SMITHVILLE TELEPHONE CO., INC. 6788 WORLDCALL COMMUNICATIONS INTERNATIONAL, INC. 6795 ORWELL TELEPHONE COMPANY 6796 AMERICAN MOBILE SATELLITE CORP. 6798 DANCRIS COMM. LLC 6835 NEW CENTURY TELECOM, INC. 6836 MCSC ACCESS IN CANADA (CSCN) 6840 BALDWIN CELLCOM, INC. 6853 UTC LONG DISTANCE, L.L.C. 6864 AMERICAN BUSINESS ALLIANCE (ABA) 6870 AMERICOM TECHNOLOGIES, INC. dba NETWORK UTILIZ. SVC. 6872 USA PAGING 6878 INFONXX 6880 AWESOME PAGING, INC. 6885 VIDEOTRON TELECOM LTEE. 6887 THE TELEPHONE CONNECTION OF L.A., INC. 6888 BUSINESS LONG DISTANCE 6892 TIME WARNER 6920 FULL SERVICE COMPUTING 6922 NORTHWEST COMMUNITY COMMUNICATIONS, INC. 6937 GERMANTOWN LONG DISTANCE 6942 XIT COMMUNICATIONS 6953 NYNEX 6963 NYNEX 6964 TOTAL TELECOMMUNICATIONS SVCS., INC. 6969 STERLING TELECOMMUNICATIONS, INC. 6981 WARWICK VALLEY TELEPHONE CO. 6999 NETWORK SERVICES LONG DISTANCE

32 TABLE 5 LIST OF FGD CIC CODE ASSIGNMENTS SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0207 2JE TELECOMMUNICATIONS 0470 AMERICAN TEL GROUP, INC. 6360 360Ø LONG DISTANCE CO., INC. 0366 AMERICAN TELCO, INC. 0968 4JV ENTERPRISES, INC. 0663 AMERICAN TELCO, INC. 5319 5 STAR TELECOM 0813 AMERICAN TELECOMMUNICATIONS ENTERPRISES 5757 800 & LONG DISTANCE SERVICES 0573 AMERICAN TELECOMMUNICATIONS HOLDING LTD. 0118 A & N TELECOM 0624 AMERICAN TELESOURCE INTERNATIONAL, INC. 0557 ABC TELECOM, INC. 0307 AMERICAN TELNET, INC. 0316 ABCO COMMUNICATIONS, INC. 5688 AMERICATEL 5473 ACC LONG DISTANCE CORPORATION 0567 AMERICOM COMMUNICATIONS 0234 ACC LONG DISTANCE CORPORATION 6870 AMERICOM TECHNOLOGIES, INC. dba NETWORK UTILIZ. SVC. 0345 ACC LONG DISTANCE CORPORATION 0192 AMERINET COMMUNICATIONS 0937 ACCESS LONG DISTANCE 0362 AMERISYSTEMS, INC. 0991 ACCESS LONG DISTANCE 5475 AMERITECH 0137 ACCESS NETWORK SERVICES, INC. 5606 AMERITECH 0013 ACCESS SERVICES dba PACIFIC NW TELECOM 6123 AMERITECH 6488 ACCESS TELECOM 0113 AMERITECH LONG DISTANCE SERVICES 5264 ACCESS WORLD COMMUNICATION 0794 AMERITEL 0551 ACCESS-PLUS, INC. 0416 AMERITEL C/O NETWORK TELEPHONE SVCS, INC. 5263 ACCESS/ON MULTIMEDIA, INC. 0975 AMERITEL LONG DISTANCE, INC. 5463 ACOMM, INC. 0284 AMERIVISION COMMUNICATIONS, INC. 5048 ACSI (AMERICAN COMMUNICATIONS SERVICES, INC.) 0617 AMVOX 0282 ACTION TELCOM CO. 5043 ANANDA WORLD BROTHERHOOD VILLAGE 5117 ADAMS TELSYSTEMS, INC. 5919 ANDRIL SERVICE GROUP 0414 ADDTEL COMMUNICATIONS 5140 ANYONE IS OKAY 0927 ADVANCED RADIO COMMUNICATIONS SYSTEMS 5777 APOLLO TELECOM 0843 ADVANCED TELECOM SYSTEMS 0095 APPLE COMMUNICATIONS 6286 ADVANCED TELECOMMUNICATIONS NETWORK, INC 5931 APPLEGATE LONG DISTANCE 5035 ADVANCED TELECOM, INC. 0256 APPLIED SIGNAL CORPORATION 0239 ADVANTAGE COMMUNICATIONS GROUP, INC. 5114 ARAMTEL 0754 ADVANTIS 0644 ARCADA COMMUNICATIONS 0755 ADVANTIS 0304 ARCH TELECOM 0772 ADVANTIS 5434 ARKLA LONG DISTANCE ADVANTAGE 0790 AFFILIATED TELECOM SVCS. INC. 5012 ARRIVA COMMUNICATIONS, INC. 5431 AGT LIMITED 0139 ASCENDING TECHNOLOGIES 0424 AGT LIMITED 0809 ASIA INTERNATIONAL SERVICES CORP. (AIC) 5368 AIR PULSE, INC. 5108 ASSOCIATED NETWORK PARTNERS, INC. (ANPI) 5380 AIR TOUCH CELLULAR 0279 ASSOCIATED TELENET INC./ A CTI COMPANY 0866 ALASCOM, INC. 5070 ASSOCIATED TELEPHONE DESIGN, INC. 5943 ALERT OPERATORS 0144 ASSOCIATION COMM. 0579 ALIANT SYSTEMS, INC. 5244 ATHENA INTERNATIONAL L.L.C. 5292 ALL WEST/WORLD CONNECT 0822 ATHENA INTERNATIONAL L.L.C. 0075 ALLCOMM LONG DISTANCE, INC. 5810 ATI TELECOM, INC. 0182 ALLGOOD TAYLOR TELEPHONE 5049 ATLANTIC CELLULAR CO., L.P. dba ATLANTIC LONG DISTANCE 0066 ALLNET 0125 ATLANTIC TELEPHONE COMPANY, INC. 0539 ALLNET 5228 ATLAS COMMUNICATIONS & TELEPHONE C.D., INC. 0044 ALLNET COMM. SVC., INC. [LDX,LEXITEL] 5134 ATLAS COMMUNICATIONS, LTD. 0444 ALLNET COMM. SVC., INC. [LDX,LEXITEL] 5177 ATLAS EQUITY, INC. dba PERFORMANCE TELECOM 5253 ALLTEL LONG DISTANCE 0730 ATNT OF UNITED BUSINESS & COMM. SVCS. 0119 ALO-USA CORP. 0287 ATS NETWORK COMMUNICATIONS 0405 ALTERNATE COMMUNICATIONS TECHNOLOGY, INC. 5353 ATU LONG DISTANCE, INC. 0760 ALTERNATIVE LONG DISTANCE, INC. 0004 ATX TELECOMMUNICATIONS SERVICES 0413 ALTERNATIVE LONG DISTANCE, INC. dba MONEY $AVERS 0686 AT&T CANADA LONG DISTANCE SERVICES CO. 5017 AMADEUS COMMUNICATIONS 0858 AT&T CANADA LONG DISTANCE SERVICES CO. 0682 AMERICALL COMMUNICATIONS 0869 AT&T CANADA LONG DISTANCE SERVICES CO. 6864 AMERICAN BUSINESS ALLIANCE (ABA) 0288 AT&T COMMUNICATIONS 0145 AMERICAN COMMUNICATIONS INT'L, LTD. 0387 AT&T COMMUNICATIONS 0061 AMERICAN COMMUNICATIONS NETWORK, INC. 0732 AT&T COMMUNICATIONS 0645 AMERICAN COMMUNICATIONS TECHNOLOGY, INC. 0375 AT&T EASYLINK SERVICES 0598 AMERICAN DISCOUNT TELECOMMUNICATIONS, INC. 0988 AT&T EASYLINK SERVICES 0411 AMERICAN EXPRESS TRAVEL RELATED SVCS. 0314 AT&T WIRELESS SERVICES, INC. 5027 AMERICAN FIBER COM, INC. 0966 AUC COMMUNICATIONS 5028 AMERICAN FIBERNET, INC. 0302 AUSTIN BESTLINE 5248 AMERICAN INTERNATIONAL TELEPHONE 0235 AUTOMATED TELEPHONE 0028 AMERICAN LONG DISTANCE CORPORATION 0779 AUTUMN COMMUNICATIONS, INC. 0540 AMERICAN LONG DISTANCE EXCHANGE, INC. 6880 AWESOME PAGING, INC. 0504 AMERICAN LONG DISTANCE SERVICES 5071 AXCES, INC. 0241 AMERICAN LONG LINES 6840 BALDWIN CELLCOM, INC. 6796 AMERICAN MOBILE SATELLITE CORP. 5927 BARTS LD GROUP 0370 AMERICAN NETWORK EXCHANGE, INC. 5261 BASCOM LONG DISTANCE

33 TABLE 5 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 5006 BAY AREA TELEPORT 0670 CAMERON LONG DISTANCE 5556 BAY SPRINGS LONG DISTANCE 0615 CAM-NET COMMUNICATIONS NETWORK, INC. 5139 BAY TNT NETWORK 0046 CAM-NET, INC. 0129 BAYSTAR SATELLITE PAGING 5303 CANADIAN TIRE ACCEPTANCE LTD. 5226 BC TEL 6634 CANNON COMMUNICATIONS CORPORATION 5322 BC TEL 0425 CAPITAL NETWORK SYSTEMS INC. 0323 BC TEL 0221 CAPITAL TELECOMMUNICATIONS, INC. 0276 BEE LINE LONG DISTANCE 0723 CAPITAL TELECOMMUNICATIONS, INC. 0243 BEEHIVE TELEPHONE 0963 CAPITAL TELECOMMUNICATIONS, INC. 5050 BELL ATLANTIC COMMUNICATIONS, INC. 5795 CAPROCK TELEMANAGEMENT 0272 BELL ATLANTIC COMMUNICATIONS, INC. 0795 CAPROCK TELEMANAGEMENT 0652 BELL ATLANTIC COMMUNICATIONS, INC. 0262 CARIB COMMUNICATIONS, L.P. 6500 BELL ATLANTIC NETWORK SERVICES, INC. 0383 CARIBBEAN TELEPHONE & TELEGRAPH, INC. 0363 BELL CANADA 5129 CARIBE COMMUNICATIONS, INC. 0187 BELLSOUTH LONG DISTANCE 0974 CARIBSAT TELECOMMUNICATIONS, INC. 0377 BELLSOUTH LONG DISTANCE 0501 CARRIER CONCEPTS INTERNATIONAL CORP. 5124 BELLSOUTH TELECOMMUNICATIONS, INC. 5675 CASCADE TELEPHONE COMPANY 6110 BELLSOUTH TELECOMMUNICATIONS, INC. 5133 CBG, INC. 0581 BEN LOMAND COMMUNICATIONS, INC. 5234 CCI PR RSA, INC. 5328 BERKSHIRE LONG DISTANCE 5876 CCI PR RSA, INC. 6400 BETHANY TELECOM 0788 C-COM 5454 BEV-R ENTERPRISES INC, T/A TOUCHTONE COMMS. 5121 CCT (CALIFORNIA CATALOG AND TECHNOLOGY) 0867 BITTEL TELECOMMUNICATIONS CORPORATION 5820 CELLCOM 0580 BIXBY TELEPHONE LONG DISTANCE CO. 0117 CELLNET 0606 BIZ TEL LONG DISTANCE TELEPHONE CO. 5515 CELLNET COMMUNICATIONS CORPORATION 0115 BKC TELECOMMUNICATIONS, INC. 0554 CELLTOLL CORPORATION 5953 BLUE MOUNTAIN CELLULAR (BMCT) dba CELLULARONE 5657 CELLULAR 29 PLUS 0870 BLUE RIDGE TELEPHONE 0530 CELLULAR LONG DISTANCE CO. (CUL) 0356 BLUEGRASS LONG DISTANCE, INC. 5284 CENTRAL TELECOM, INC. 0622 BMG 0180 CENTRAL TELEPHONE CO. 0037 BN1 TELECOMMUNICATIONS, INC. 5993 CENTRAL TEXAS COMMUNICATIONS, INC. 0634 BOTTOM LINE TELECOMMUNICATIONS, INC. 6486 CENTURION INTELNET 5018 BRAHAMS COMMUNICATIONS 0672 CENTURY COMMUNICATIONS 0836 BRANSON TELEPHONE 0550 CENTURY LONG DISTANCE 5798 BRAZORIA LONG DISTANCE CO. 0505 CENTURY TELECOMMUNICATIONS, INC. 5067 BRAZOS LONG DISTANCE 0914 CENTURY TELECOMMUNICATIONS, INC. 5132 BRINDLEE MOUNTAIN TELEPHONE COMPANY 0856 CFW NETWORK, INC. 5551 BRITTAN COMMUNICATIONS INTERNATIONAL CORP. (BCI) 0909 CHADWICK TELEPHONE 5739 BROADCAST MEDIA SATELLITE 5323 CHARITON VALLEY LONG DISTANCE CORPORATION 5115 BROOKS FIBER COMMUNICATIONS 5571 CHAUTAUQUA & ERIE COMMUNICATIONS, INC. 5040 BROWN SERVICE COMPANY 0571 CHAUTAUQUA & ERIE COMMUNICATIONS, INC. 5922 BRYANT SERVICE 5715 CHEQUAMEGON TELEPHONE COOPERATIVE, INC. 6100 BT TELECOM, INC. 0270 CHERRY COMMUNICATIONS 0368 BUDGET CALL LONG DISTANCE 0343 CHESTER LONG DISTANCE SERVICES, INC. 0112 BUSINESS DISCOUNT PLAN dba LD DISCOUNT PLAN 5282 CHIBARDUN TELEPHONE COOPERATIVE, INC. 6888 BUSINESS LONG DISTANCE 0467 CHICKASAW LONG DISTANCE CO. 6205 BUSINESS PHONES 5127 CHOICE 1 COMMUNICATIONS 0833 BUSINESS TELECOM, INC. 5942 CHRISTINE LD SERVICE 0791 B.R. COMMUNICATIONS 5511 CIMCO COMMUNICATIONS 5973 C R TELCO, INC.,dba CAP ROCK TELECOMM. 0286 CINCINNATI BELL LONG DISTANCE 6777 CABLE PLUS dba TELEPHONE PLUS 0293 CINCINNATI BELL LONG DISTANCE 6222 CABLE & WIRELESS BERMUDA 0614 CINCINNATI BELL LONG DISTANCE 0223 CABLE & WIRELESS COMMUNICATIONS, INC. 0654 CINCINNATI BELL LONG DISTANCE 0839 CABLE & WIRELESS COMMUNICATIONS, INC. 5300 CINCINNATI BELL TELEPHONE 5212 CABLE & WIRELESS, INC. 5423 CITIZENS LONG DISTANCE CO. 5213 CABLE & WIRELESS, INC. 5260 CITIZENS MUTUAL TELEPHONE COMPANY 5214 CABLE & WIRELESS, INC. 5512 CITIZENS TELECOM 0819 CABLEVISION LIGHTPATH, INC. 0038 CITIZENS TELECOM 6268 CADETELCO, LLC dba ALL STATES TELEPHONE CO. 0096 CITIZENS TELECOM 0300 CALL AMERICA 5225 CITIZENS TELEPHONE COOPERATIVE - IXC 0351 CALL AMERICA OF RIVERSIDE 6715 CITIZENS TELEPHONE COOPERATIVE, INC. 0410 CALL AMERICA/PALM DESERT 0956 CITY TELECOM INC. (CITI) 5128 CALL FOR LESS 0774 CITYNET COMMUNICATIONS, INC. 0259 CALL FOR LESS LONG DISTANCE 5357 CL TEL LONG DISTANCE, INC. 0291 CALL SAVERS, INC. 0548 CLEARTEL COMMUNICATIONS 0091 CALL TECHNOLOGY CORP. OF PHILADELPHIA 5267 CMS COMMUNICATIONS 0715 CALL U.S.INCORPORATED 5971 C-NET COMMUNICATIONS 5920 CALLUM LONG DISTANCE 0063 COAST INTERNATIONAL, INC. 5456 CALTECH INTERNATIONAL TELECOM CORPORATION 0902 COAST TO COAST TELECOMMUNICATIONS

34 TABLE 5 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0492 COASTAL LONG DISTANCE SERVICES, INC. 6001 DHC, INC. 0661 COASTAL TELEPHONE CO. 6409 DIAMOND COMMUNICATIONS 0881 COASTAL TELEPHONE CO. 6265 DIGI COM 6088 COLLECTIVE COMMUNICATION SERVICES, INC. 6324 DIGI-CELL, INC. 0306 COLORADO RIVER COMMUNICATIONS 0181 DIGITAL COMMUNICATIONS, INC. 0619 COLORADO RIVER COMMUNICATIONS 0064 DIGITAL NETWORK SERVICES, INC. 0197 COMANCHE COUNTY LONG DISTANCE 0071 DIGITAL NETWORK, INC. 0934 COMCENTRAL dba SOUTHNET SERVICES, INC. 0143 DIGITAL NETWORK, INC. 5063 COMINEX 0586 DIGITAL NETWORK, INC. 5145 COMLITE, INC. 0853 DIGITAL NETWORK, INC. 0748 COMMNET CELLULAR, INC. 0281 DIGITAL TECHNOLOGIES, INC. 0336 COMMONWEALTH LONG DISTANCE CO. 0671 DIGITAL TELECOMMUNICATIONS, INC. 0949 COMMONWEALTH OF PENNSYLVANIA 0543 DIGITRAN CORP. 5036 COMMONWEALTH TELECOM, INC. 5316 DIRECT NET TELECOMMUNICATIONS 0339 COMMUNICATION CABLE LAYING CO., INC. 0814 DISCOUNT AMERICA 0349 COMMUNICATION CABLE LAYING CO., INC. 5265 DISCOUNT LONG DISTANCE 0675 COMMUNICATION SERVICES OF COLORADO 0354 DISCOUNT LONG DISTANCE OF AMERICA 0640 COMMUNICATIONS BROKERS, INC. 6543 DISCOUNT NETWORK SERVICES, INC. (DNS) 0667 COMMUNICATIONS INC.dba ECI 0082 DISCOUNT PAYPHONE 0073 COMMUNICATIONS OPTIONS INC. 5105 DISCOUNT PLUS 0065 COMMUNICATIONS SYSTEMS INTERNATIONAL 0123 DISCOVERY TELECOM, INC. 5910 COMMUNICATIONS TECHNOLOGY GROUP 5172 DMI COMMUNICATIONS GROUP, INC. 0484 COMMUNITY LONG DISTANCE 5737 DOBSON WIRELESS, INC. 0130 COMPUTER TELEPHONE CORP. 0514 DOMINICAN COMMUNICATIONS 5126 COMSAT 5019 DVORAK 6401 COMTEL TECH 0417 DWR LONG DISTANCE 0238 COMWEST COMMUNICATIONS 5831 D.H. COMMUNICATIONS 5976 CONCORD TELEPHONE COMPANY, INC. 0594 EAGLECOM, INC. 0893 CONCORD TELEPHONE LONG DISTANCE (CT LONG DISTANCE) 6322 EARTHCALL COMMUNICATIONS CORPORATION 0541 CONETCO COMMUNICATIONS CORPORATION 0808 EASTERN TELECOM dba INTERQUEST 0660 CONNECT AMERICA COMMUNICATIONS, INC. 0136 EASTERN TELECOM INTERNATIONAL 0374 CONNECT AMERICOM CORP. 6384 EASTERN TELECOMMUNICATIONS INC. (ETI) 5445 CONNECTICUT TELEPHONE & COMM. SYSTEMS, INC. 5120 EASTERN TELELOGIC CORPORATION 0257 CONQUEST 0303 EASTERN TELELOGIC CORPORATION 0319 CONQUEST 0054 EASTERN TELEPHONE SYSTEMS, INC. 0043 CONSOLIDATED COMM. PUBLIC SERVICES 5324 EASTGATE COMMUNICATIONS, INC. (ECI) 0725 CONSOLIDATED NETWORK INC. 0194 EASTON TELECOM SERVICES, INC. 0816 CONSOLIDATED TECHNOLOGIES, INC (CTI) 5279 EASY CELLULAR 0646 CONTACT AMERICA, INC. 0389 EATELNET 0386 CONTINENTAL CABLEVISION 0327 ECI COMMUNICATIONS 0701 CONTINENTAL LONG DISTANCE 0497 ECON-A-CALL INC. OF HAYS 5559 COOPERATIVE COMMUNICATIONS, INC. 0952 ECONOCOM LONG DISTANCE 5787 COOPERATIVE TELEPHONE COMPANY 0373 ECONO-LINE WACO/ECONO-LINE MIDLAND 0127 CORPORATE COMMUNICATIONS GROUP, INC. 0060 ECONOMY TELEPHONE, INC. 6753 CORPORATE SERVICES TELCOM 0604 ECONOPHONE, INC. 0690 CORPORATE TELEMANAGEMENT GROUP 0325 ECONO. CALL LONG DISTANCE SERVICES 5221 CORRECTIONAL COMMUNICATIONS CORPORATION, INC. 0324 EDMONTON TELEPHONE CORPORATION 6269 COX COMMUNICATIONS, INC. 0625 EDS 0199 CRESCENT COMMUNICATIONS 0650 EDS 5821 CRYSTAL COMMUNICATIONS 0273 EDS . 5250 CRYSTAL COMMUNICATIONS, INC. 5007 EGYPTIAN COMMUNICATIONS SERVICES, INC. 5262 CST COMMUNICATIONS, INC. 0802 ELECTRIC LIGHTWAVE, INC. 0659 CTA COMM. INC. dba CTA LONG DISTANCE 5130 ELLTEL WIRELESS 0834 CTS TELCOM OF FLORIDA 0365 EMI COMMUNICATIONS CORP 6673 CURRY COMMUNICATIONS, INC. 5697 EMPIRE COMMUNICATIONS SERVICES CORPORATION 0585 CUSTOM TELECONNECT, INC. 0359 EMPIRE ONE TELECOMMUNICATIONS, INC. 5880 CYBERNET COMMUNICATIONS 0078 ENHANCED SERVICES BILLING, INC. (ESBI) 0613 CYBERNET INTERNATIONAL, INC. 0532 EQUAL ACCESS OF WASHINGTON 0203 CYPRESS TELECOMMUNICATIONS CORP. (CYTEL) 5009 EQUALITY PLUS TELECOMMUNICATIONS 0361 DAKOTA COOPERATIVE TELECOMM., INC. 5122 EQUALNET CORPORATION 6798 DANCRIS COMM. LLC 0364 EQUICOM COMMUNICATIONS, INC. 0147 DATA & ELECTRONIC SERVICES, INC. 0441 ESCONDIDO TELEPHONE COMPANY 5712 DATACOMM INTERNATIONAL CO. LTD. 0415 ESPI, INC. 5053 DEKALB TELEPHONE COOPERATIVE INC. 5500 ESS VENTURES, INC. 0233 DELTACOM L.D.S. 5383 ETEX LONG DISTANCE dba ETEX CELLULAR CO., INC. 0240 DELTACOM L.D.S. 0048 ETSC 5335 DELTATEL, INC. 0752 EXCEL TELECOMMUNICATIONS, INC. 0693 DELUXE DATA SYSTEMS 0828 EXCEL TELECOMMUNICATIONS, INC. 0950 DEPARTMENT OF THE TREASURY, IRS 5930 EXCO LONG DISTANCE

35 TABLE 5 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0865 EXPRESS COMMUNICATIONS, INC. 5485 GLENNERIC COMMUNICATIONS, INC. 0429 EXTELCOM dba EXPRESS TEL 0295 GLENS FALLS LONG DISTANCE SERVICE 0493 EXTELCOM dba EXPRESS TEL 0206 GLOBAL COM 6408 FAIRVIEW TELECOM 5588 GLOBAL RATE PROCESSING 5042 FAR POINT 0435 GLOBAL TELEMEDIA INTERNATIONAL, INC. 0531 FARMERS LONG DISTANCE, INC. 0455 GLOBAL TEL*LINK, INC. 5257 FARMERS MUTUAL COOPERATIVE TELEPHONE CO. 5714 GLOBAL TONE COMMUNICATIONS, INC. 5259 FARMERS MUTUAL TELEPHONE CO. 5443 GLOBALCOM, INC. 6404 FASTLINE COMMUNICATION NETWORK 0469 GMW COMPANY 0447 FAXNET CORPORATION 5476 GRANITE STATE LONG DISTANCE 5326 FBN AMERICA, INC. 5118 GREAT LAKES TELECOMMUNICATIONS (GLTC) 0922 FEB CORPORATION 5453 GROUP LONG DISTANCE, INC. 0285 FEDERAL TRANSTEL, INC. 0344 GST CALL AMERICA 0679 FEIST LONG DISTANCE 0583 GST NET, INC. 0051 FIBERLINK COMMUNICATIONS CORP. 5478 GST PACWEST TELECOM, INC. 0704 FIBERNET TELECOMMUNICATIONS, INC. 5756 GST TELECOM, INC. 0350 FIBERNET TELEMANAGEMENT, INC. 0185 GTC 5037 FIBERNET, INC. 5483 GTE CARD SERVICES INC. dba GTE LONG DISTANCE 0479 FIBERTECH TELECOM, INC. 6224 GTE CARD SERVICES INC. dba GTE LONG DISTANCE 0472 FIRST CHOICE LONG DISTANCE, INC. 5448 GTE INTERNAL TELECOMMUNICATION SERVICES 0935 FIRST CHOICE LONG DISTANCE, INC. 5249 GTE TELEPHONE OPERATIONS 0841 FIRST FINANCIAL MANAGEMENT CORP. 0886 GUIDE NETWORK INTERNATIONAL 0475 FIRSTEL 0962 GULF LONG DISTANCE, INC. 5052 FIVE AREA LONG DISTANCE 5432 G.E. EXCHANGE 0379 FLEABUSTERS 0820 G.E. EXCHANGE 5940 FLEMING LONG DISTANCE 0691 HAMILTON TELECOMMUNICATIONS 6362 FOCAL COMMUNICATIONS CORP. 6108 HANCOCK RURAL TELEPHONE CORPORATION 0503 FONE AMERICA, INC. 5202 HART COMMUNICATIONS, INC. dba HART TEL. LONG DISTANCE 5835 FONETEL 0015 HAWAIIAN TELEPHONE COMPANY (GTE) 0507 FONOROLA 5422 HCC TELEMANAGEMENT 5939 FOREST PINE TELCOM 5381 HEALTH LIABILITY MANAGEMENT 5678 FORT BEND LONG DISTANCE 5331 HEART OF IOWA COMMUNICATIONS, INC. 0637 FOX COMMUNICATIONS CORP. 5840 HEBRON CORPORATION 5039 FREEDOM TELECOMMUNICATIONS INC. 0049 HEDGES & ASSOCIATES 5665 FRESH START COMMUNICATIONS - FSC 6424 HELMSCO, INC. dba. CENTRAL LINK COMM. 5020 FRIENDLY VOICE NETWORK 0584 HEREFORD LONG DISTANCE SERVICES 0506 FRIENDSHIP LONG DISTANCE 5021 HERITAGE COMMUNICATIONS 0003 FRONTIER COMMUNICATIONS INT'L, INC. 0261 HERTZ TECHNOLOGIES, INC. 0086 FRONTIER COMMUNICATIONS INT'L, INC. 5917 HICKORY GROVE GROUP 0211 FRONTIER COMMUNICATIONS INT'L, INC. 6381 HICKORY TELEPHONE COMPANY 0245 FRONTIER COMMUNICATIONS INT'L, INC. 5426 HIGHLAND COMMUNICATIONS CORP. 0515 FRONTIER COMMUNICATIONS INT'L, INC. 0722 HI-PLAINS NTS COMMUNICATIONS 0516 FRONTIER COMMUNICATIONS INT'L, INC. 0750 HI-RIM COMMUNICATIONS, INC. 0232 FRONTIER COMMUNICATIONS OF THE GREAT LAKES, INC. 5047 HLC INTERNET 0500 FRONTIER COMMUNICATIONS OF THE GREAT LAKES, INC. 0965 HOGAN COMMUNICATIONS 0202 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 5520 HOME LONG DISTANCE, INC. 0231 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0882 HOME OWNERS L.D. dba HOLD BILLING SVCS. 0260 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 5925 HONE COMMUNICATIONS 0322 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0920 HONGKONG TELECOM (CANADA) 0400 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 5484 HORIZON TELECOMMUNICATIONS, INC. 0511 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0124 HORRY TELEPHONE LONG DISTANCE, INC. 0633 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 6101 HOST NETWORK, INC. 0705 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0392 HSS VENDING DISTRIBUTORS 0831 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 5482 HTC COMMUNICATIONS CO. 0958 FRONTIER COMMUNICATIONS-NORTH CENTRAL REGION, INC. 0340 HUB DISTRIBUTING, INC. 0058 FRONTIER LOCAL SERVICES, INC. 0681 HUNTLEIGH TELECOMM. GROUP, INC. 0694 FRONTIER LONG DISTANCE OF AMERICA 6484 HYPERION TELECOMMUNICATIONS INC. 5772 FTI COMMUNICATIONS 0419 H.G. TELECOM, INC 0735 FTI COMMUNICATIONS 5444 I DON'T CARE 6920 FULL SERVICE COMPUTING 5136 I DON'T KNOW 6412 FUTURE CONNECT 6405 IACT 0121 FUTURE TELEPHONE COMMUNICATIONS 0513 ICG dba INTERCONTINENTAL COMMS. LONG DISTANCE 6407 GALA COMMUNICATIONS 0706 ICON COMMUNICATIONS CORPORATION 0997 GAS COMPANY OF NEW MEXICO 0328 IDAHO STATE GOVERNMENT 5015 GATEWAY COMMUNICATIONS, LTD. 6437 IDS LONG DISTANCE, INC. 0077 GENERAL COMMUNICATION, INC. 0023 IDS LONG DISTANCE, INC. 5830 GENESIS COMMUNICATIONS INT'L, INC. 0141 IFC COMMUNICATIONS 5436 GEOTEL COMMUNICATION SERVICES, INC. 5519 INCLINE COMMUNICATIONS, INC. 6937 GERMANTOWN LONG DISTANCE 0527 INDEPENDENCE TELEPHONE CO.

36 TABLE 5 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0460 INDEPENDENT NETWORK SERVICES, INC. 5532 LACKAWAXEN LONG DISTANCE CO. 0796 INDIANTOWN TELEPHONE LONG DISTANCE 0552 LAKE STATES COMMUNICATIONS, INC. 6406 INDICOM 5535 LAKEDALE LINK, INC. 5970 INFONET LONG DISTANCE, L.L.C 5553 LAKEFIELD COMMUNICATIONS, INC. 6878 INFONXX 0193 LANDMARK COMMUNICATIONS COMPANY, INC. 5061 INFO-TEL COMMUNICATIONS INC. 5013 LANSER TELECOM, INC. 0433 INFO-TEL, INC. 0711 LAS VEGAS CONVENTION & VISITORS AUTHORITY 0510 INNOVATIVE COMMUNICATIONS, INC. 5548 LAUREL HIGHLAND LONG DISTANCE CO. 0020 INNOVATIVE TELECOM CO. 0562 LCI 0696 INTEGRATED SYSTEMS CORPORATION 0012 LCI INTERNATIONAL 5487 INTEGRATED TELESERVICES, INC. 0358 LCI INTERNATIONAL 0402 INTEGRETEL, INC. 0451 LCI INTERNATIONAL 0591 INTEL COMMUNICATIONS 0452 LCI INTERNATIONAL 0465 INTELCO 0537 LCI INTERNATIONAL 0599 INTELCOM GROUP, INC. 0665 LCI INTERNATIONAL 0034 INTELLICALL OPERATOR SERVICES 0487 LCT LONG DISTANCE 0025 INTER CONTINENTAL TELEPHONE 0561 LCT LONG DISTANCE 6423 INTER DIVISION COMM 0684 LCT LONG DISTANCE 5468 INTERACTIVE NETWORK SYSTEM, INC. (INET) 5937 LD BRUCE 0936 INTERAMERICAN TELEPHONE CO. (ITC) 5321 LDC TELECOMMUNICATIONS, INC. 5101 INTERCONTINENTAL COMMUNICATIONS CORP. 5060 LDCC, INC. 0605 INTERCONTINENTAL TELCOM INC. 6600 LDM SYSTEMS, INC. 0904 INTERLINK TELECOMMUNICATIONS 5255 LEAST COST ROUTING dba LONG DISTANCE CHARGES 5393 INTERMEDIA COMMUNICATIONS, INC. 0299 LECNET, INC. 0393 INTERMEDIA COMMUNICATIONS, INC. 5524 LEGAL AID SOCIETY OF ORANGE COUNTY 0943 INTERNATIONAL CELLULAR, INC. (ICI) 6419 LEWIS COMMUNICATIONS 5031 INTERNATIONAL OPERATORS, INC. 0525 LEXINGTON TELEPHONE L.D. CO., INC. 0404 INTERNATIONAL TELCOM, LTD. 0708 LIGHT LINK INC/dba TAYLOR COMM. GRP. 5318 INTERNATIONAL TELECOMMUNICATION CORP. 5109 LIGHTCOM INTERNATIONAL 5698 INTERNATIONAL TELECOM, INC. (ITI) 0563 LINKUSA CORPORATION 0076 INTERNATIONAL TELEMEDIA ASSOCIATES, INC. 0236 LITEL/LCI INTERNATIONAL 0310 INTERNATIONAL TELEPHONE CORP. (ITC) 0253 LITEL/LCI INTERNATIONAL 5024 INTERSTATE OPERATORS, INC. 0432 LITEL/LCI INTERNATIONAL 0068 INTERSTATE SAVINGS 0512 LOCATE TELEPHONE COMPANY 0964 INTERSTATE TELECOM SVCS. INC. 0369 LOMA INTERNATIONAL, INC. 5051 INTER-TEL NETSOLUTIONS 0960 LONDON TELECOM 0508 INTEX 0205 LONE STAR TELECOM 6255 INT'L. SERVICES NETWORK, INC. dba ISN COMMUNICATIONS 0035 LONG DISTANCE AMERICA 0685 INTL.800 TELECOM dba TELECALL LONG DIST. 6411 LONG DISTANCE ASSISTANCE 0283 IOWA COMMUNICATIONS NETWORK 5334 LONG DISTANCE DIRECT, INC. 6225 IOWA NETWORK SERVICES, INC. 0533 LONG DISTANCE DISCOUNT INC. 0225 IOWA NETWORK SERVICES, INC. 0799 LONG DISTANCE INTERNATIONAL 5320 IPC IXNET 0536 LONG DISTANCE MANAGEMENT 0486 IRONTON LONG DISTANCE CO. 0382 LONG DISTANCE MANAGEMENT INC. 0422 ISLAND TEL, PEI 0395 LONG DISTANCE NETWORK 5137 IT DOESN'T MATTER 0631 LONG DISTANCE OF MICHIGAN 0897 ITC NETWORK OF UTAH 0564 LONG DISTANCE OHIO, INC. 0468 ITC NETWORKS 0036 LONG DISTANCE SAVERS 0478 ITC NETWORKS 0213 LONG DISTANCE TELEPHONE SAVERS 6483 IT&E OVERSEAS, INC. 0069 LONG DISTANCE TRANSFER, INC. 5135 IXC LONG DISTANCE, INC. (IXC LD) 0297 LONG DISTANCE WHOLESALE CLUB 5029 J B OPERATORS, INC. 0252 LONG DISTANCE/USA [SPRINT] 5011 JONES COMMUNICATIONS, INC. 5151 LOTEL CO. INC. 0947 JSM TELE-PAGE 0803 LOW COUNTRY CARRIER dba HARGRAY L.D. CO. 5268 JUSTICE LONG DISTANCE, INC. 0928 LOW COUNTRY CARRIER dba HARGRAY L.D. CO. 5107 KANOKLA COMMS., INC.dba KANOKLA LONGDISTANCE 0931 L.D. NETWORK, INC. 5941 KBTN 0280 L.D. SERVICES, INC 0388 KDD AMERICA, INC. 0398 M2 COMMS. dba DIAL LONG DISTANCE BILLING SVCS. 0925 KELHORN COMMUNICATIONS, INC. 5633 MADISON NETWORK SYSTEMS, INC. 0062 KENTUCKY TELEPHONE CORP. 6674 MANAGED NETWORK SYSTEMS, INC. 0703 KEYSTONE TELECOMMUNICATIONS, INC. 0783 MANITOBA TELEPHONE SYSTEM 0545 KEYSTONE TELECOM, INC. 0357 MANITOWOC LONG DISTANCE SERVICE 5711 KING SALMON COMMUNICATIONS, INC. 0014 MARATHON COMMUNICATIONS 5367 KINNET 5784 MARIANNA-SCENERY HILL LONG DISTANCE CO. 5045 KLP, INC. dba CALL-AMERICA 0434 MARITIME TEL & TEL 5929 KNOX SERVICE GROUP 5765 MARNE & ELK HORN TELEPHONE CO. 0989 KRB TELECOM 6282 MARQUETTE-ADAMS TELEPHONE COOPERATIVE, INC. 5016 KTNT COMMUNICATIONS 0697 MATRIX TELECOM 0148 KULL CELLULAR CORP.dba ALLEGAN CELLULAR 0780 MATRIX TELECOM 6301 K&S INTERNATIONAL COMMUNICATIONS, INC. 5852 MAT-TELL COMMUNICATIONS, INC. 0926 LA CONEXION FAMILIAR, INC. 0022 MCI

37 TABLE 5 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0092 MCI 5872 NATIONWIDE PAGING, INC. 0122 MCI 0448 NB TEL 0133 MCI 0072 NBD BANK, NA 0222 MCI 0017 NCHE TELECOMMUNICATIONS NETWORK, INC. 0888 MCI 0639 NEP LONG DISTANCE CO. 0898 MCI 0098 NETECH COMM. A US WEST COMPANY 0900 MCI 5041 NET-TEL CORPORATION 0986 MCI 0026 NET-TEL CORPORATION 0183 MCI METRO 0871 NETWORK BILLING AND COLLECTIONS, INC. 0188 MCI/1-800-COLLECT 5577 NETWORK CARRIER SERVICES 0170 MCLEOD NETWORK SERVICES 5680 NETWORK ENHANCED TECHNOLOGIES, INC. (NET) 6836 MCSC ACCESS IN CANADA (CSCN) 0765 NETWORK LONG DISTANCE 5926 MCV TELCOM 0179 NETWORK MARKETING GROUP 6356 MEGAWATS 0135 NETWORK ONE 0093 MELBOURNE INTERNATIONAL COMM. LTD. 0717 NETWORK ONE, INC. 5455 MERIDIAN TELECOM CORPORATION 0308 NETWORK OPERATOR SERVICES, INC. 0449 MERRILL LYNCH 0764 NETWORK PLUS 0138 METCOM CANADA LIMITED 5332 NETWORK RECOVERY SERVICES, INC. 0565 METRO ONE DIRECT 6999 NETWORK SERVICES LONG DISTANCE 0860 METRO TELECOMM.SVCS.,INC. dba METROCOMM 0785 NETWORK TECHNOLOGIES INC. 0635 METRO TELEPHONE, INC. 6835 NEW CENTURY TELECOM, INC. 0216 METROLINK 0940 NEW ENGLAND TELEDISCOUNT SYSTEMS, INC. 0258 METRONET LONG DISTANCE COMMUNICATIONS 6665 NEW NORTH TELECOMMUNICATIONS, INC. 5895 METROTEL COMMUNICATIONS 0945 NEW TIMES, INC. 5682 METROTIME COMMUNICATIONS 0445 NEWFOUNDLAND TELEPHONE 6010 MFS INTELENET, INC. 6398 NEXTEL COMMUNICATIONS 6011 MFS INTELENET, INC. 5119 NEXTLINK 6012 MFS INTELENET, INC. 0423 NICKEL FONE 0440 MFS INTELNET, INC. 5653 NLD, USA 5001 MH COMMUNICATIONS, INC. 0498 NORLIGHT TELECOMMUNICATIONS, INC. 5288 MICHIGAN INDEPENDENT NETWORK, INC. 0499 NORLIGHT TELECOMMUNICATIONS, INC. 6682 MICRONESIAN TELECOMMUNICATIONS CORPORATION (MTC) 0837 NORLIGHT TELECOMMUNICATIONS, INC. 6288 MICROVOICE APPLICATIONS, INC. 5168 NORTH AMERICAN COMMUNICATIONS CONTROL, INC. 0648 MID MCND dba MIDCOM COMMUNICATIONS, INC. 0027 NORTH AMERICAN COMMUNICATIONS GROUP 0495 MID SEA dba MIDCOM COMMUNICATIONS, INC. 0933 NORTH AMERICAN COMMUNICATIONS, INC. 0621 MID TNC dba MIDCOM COMMUNICATIONS, INC. 6232 NORTH AMERICAN DIGICOM CORPORATION 0338 MIDCO COMMUNICATIONS 0601 NORTH AMERICAN INTELECOM 0996 MIDCO COMMUNICATIONS 0201 NORTH AMERICAN TELEPHONE 0810 MIDCOM COMMUNICATIONS, INC. 5044 NORTH AMERICAN TELEPHONE NETWORK, INC. 0558 MIDCOM OF ARIZONA,INC. 0890 NORTH COUNTY COMMUNICATIONS CORPORATION 5173 MID-MAINE TELPLUS dba MID-MAINE LONG DISTANCE 5635 NORTH DAKOTA LONG DISTANCE 0959 MID-PLAINS TELEPHONE, INC. 5679 NORTH PITTSBURGH TELEPHONE COMPANY 0932 MIDTEL LONG DISTANCE MINOT 6325 NORTH STATE TELEPHONE LONG DISTANCE CO. 0680 MIDWEST TELEPHONE SERVICE, INC. 6332 NORTHEAST FLORIDA LONG DISTANCE COMPANY, INC. 6264 MIIC dba POLARIS TELCOM 5800 NORTHEAST TELEPHONE LONG DISTANCE, INC. 0264 MIIC dba POLARIS TELCOM 0491 NORTHERN ARIZONA COMMUNICATIONS CORP. 5762 MIKROTEC INTERNET SERVICES, INC. 0376 NORTHERN TELECOM, INC. 5928 MINH LONG DISTANCE 5310 NORTHERN TELEPHONE & DATA (NTF) 5032 MORNINGSTAR COMMUNICATIONS, INC. 0713 NORTHERN WISCONSIN L.D.S. 0305 MOTOROLA INC. 0332 NORTHLAND TELEPHONE SYSTEMS LTD. 5229 MOUNTAIN WEST LONG DISTANCE 6922 NORTHWEST COMMUNITY COMMUNICATIONS, INC. 5030 MOUNTAINVIEW COMMUNICATIONS, INC. 0638 NORTHWEST TELECOM, LTD. 0132 MPC BUS. COMMS. SYSTEMS, INC./EASTON TELECOM SVCS. 5375 NORTHWESTERN INDIANA TELEPHONE CO. 0912 MRC TELECOMMUNICATIONS, INC. 0210 NOS COMMUNICATIONS, INC. 5329 MTC LONG DISTANCE 0094 NOSVA, L.P. 5689 MTX COMMUNICATIONS 5839 NPS, INC. 0171 MULTIMEDIA LONG DISTANCE CO. 0908 NTC, INC. 0829 MULTIMEDIA TELEPHONE SERVICE, INC. 0401 NTI 5934 MUSTANG OPERATORS 0623 NTI 0688 MUSTANG TELE-COMMUNICATIONS, INC. 5797 NTI TELECOM, INC. 0827 MVP COMMUNICATIONS, INC. 0687 NTS COMMUNICATIONS INC. 5566 M.T. CORPORATION 0407 NUESTRA TELEFONICA 0806 NACT 5110 NYNEX 0549 NATIONAL BRANDS, INC. 6953 NYNEX 0632 NATIONAL DATA CORPORATION 6963 NYNEX 5026 NATIONAL FIBER COM, INC. 0698 NYNEX - CORRIDOR 0326 NATIONAL FIBERNET, INC. 0658 OCI 0059 NATIONAL INDEPENDENT CARRIER EXCH., INC. 0805 OCI 0656 NATIONAL NETWORK CORP. 0590 OCOM CORPORATION 5385 NATIONAL TELCOM MANAGEMENT INC 5959 OGDEN TELEPHONE LONG DISTANCE 0657 NATIONAL TELECOM OF FLORIDA 5894 OKLAHOMA LONG DISTANCE 0603 NATIONAL TELEPHONE COMMUNICATIONS 5911 OLD HOME OPERATOR 0746 NATIONAL TELEPHONE EXCHANGE (PA) 5912 OLD LAREDO SERVICE 0341 NATIONAL TELE-SAV, INC. 0509 OLYMPIC TELECOMMUNICATIONS, INC. 0716 NATIONWIDE COMMUNICATIONS, INC. 0769 OMNI COMMUNICATIONS, INC. 0627 NATIONWIDE EMERGENCY TELECOMM. SYSTEM 0391 OMNICALL COMMUNICATIONS CORPORATION 0057 NATIONWIDE LONG DISTANCE 0226 ONE CALL COMMUNICATIONS 0403 NATIONWIDE LONG DISTANCE 0880 ONE CALL COMMUNICATIONS

38 TABLE 5 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0873 ONE STAR LONG DISTANCE 6644 PYMATUNING INDEPENDENT TELEPHONE COMPANY 5235 ONE STOP COMMUNICATIONS 0942 QCC, INC. 0390 ONE-2-ONE COMMUNICATIONS 0971 QUEST TELECOMMUNICATIONS, INC. 5983 ONEONTA TELEPHONE CO., INC. 5789 QUESTAR INFOCOMM INCORPORATED 0891 OPERATOR SERVICE COMPANY 0056 QWEST COMMUNICATIONS 0695 OPTICALL COMMUNICATIONS SERVICES 0047 RANGER TELECOMMUNICATIONS 6464 ORLANDO DIGITAL TELEPHONE CORP. 5004 RAPID LINK, U.S.A., INC. 6795 ORWELL TELEPHONE COMPANY 5033 REA LONG DISTANCE 5980 OVERLOOK COMMUNICATIONS INTERNATIONAL 0079 RED ROSE SYSTEMS dba D&E LONG DISTANCE 0651 O.L.C. COMPANY 0463 REDWOOD LONG DISTANCE 0572 PAC TEL PAGING, A PACIFIC TELESIS CO. 6403 REGENCY LONG DISTANCE 0757 PACE LONG DISTANCE SERVICE 5103 RESERVE LONG DISTANCE 0758 PACE LONG DISTANCE SERVICE 5113 RESIDENTIAL COMMUNICATIONS NETWORK 5072 PACIFIC BELL 5296 RGDATA, INC. 5465 PACIFIC BELL 0134 RIKTEL COMMUNICATIONS, INC. 0372 PACIFIC BELL COMMUNICATIONS 5935 RIVERBEND COMMUNICATIONS 0597 PACIFIC GATEWAY EXCHANGE 6420 RKS COMMUNICATIONS 5131 PACIFIC TELECOM, INC. (PTI) 0111 ROSEVILLE TELEPHONE CO. 0099 PAC-WEST TELECOMM, INC. dba AMERICALL 0519 RSL COM U.S.A. 6057 PALMER MUTUAL TELEPHONE CO. 0618 RSL COM U.S.A. 6034 PANTEL COMMUNICATIONS 5025 RYAN COMMUNICATIONS, INC. 0191 PARADISE COMMUNICATIONS 0642 R,D,&J COMMUNICATIONS MGMT. INC. 0553 PARKWAY COMMUNICATIONS, INC. 0438 SAM'S DISCOUNT LONG DISTANCE, INC. 5333 PARTNER COMMUNICATIONS GROUP 5913 SANDELL OPERATOR SERVICE 0251 PARTNERS TELECOM, INC. 0242 SASKTEL 0917 PAY TEL COMMUNICATIONS, INC. 5501 SATELLITE COMMUNICATIONS SYSTEMS, INC. 5377 PAYLESS LONG DISTANCE, LTD 6413 SAVEMORE NETWORK 5758 PAYLESS TELECOM, INC. 0088 SBS/MCI 0767 PAYLINE SYSTEMS, INC. 0734 SCHERERS COMMUNICATIONS GROUP, INC. 5104 PAYPHONE CONSULTANTS, INC. (PCI) 0542 SEATTLE LONG DISTANCE NETWORK, INC. 6722 PBC LONG DISTANCE 5023 SELECT COMMUNICATIONS 6102 PCI 5116 SEQUEL COMMUNICATIONS, INC. 0178 PDQ COMMUNICATIONS SOURCE 0018 SHARED USE NETWORK 0775 PENCOR SERVICES dba PALMERTON LONG DIST. 5753 SHERBURNE LONG DISTANCE, INC. 0743 PENINSULA LONG DISTANCE SERVICE, INC. 0778 SHOW-ME LONG DISTANCE, INC. 0412 PENN TELECOM, INC. 5858 SIERRA TELEPHONE LONG DISTANCE 0728 PEOPLES COMMUNICATION, INC. 5034 SIGNATURE NETWORK SERVICE 0227 PEOPLE'S TELEPHONE COMPANY, INC. 5297 SIMPLY LONG DISTANCE, INC. (SLD) 0490 PHOENIX COMMUNICATIONS GROUP, INC. 6402 SISK COMMUNICATIONS 5600 PHOENIX NETWORK 6782 SMITHVILLE TELEPHONE CO., INC. 0244 PHOENIX NETWORK 0126 SONIC COMMUNICATIONS, INC. 0420 PHOENIX NETWORK 0892 SOUND COMMUNICATIONS WEST 5599 PHONE MICHIGAN 0770 SOURIS RIVER TELECOMMUNICATIONS COMPANY 0838 PHONETEL TECHNOLOGIES, INC. 0807 SOUTH CAROLINA NETWORK, INC. 0930 PILGRIM TELEPHONE INC. 5148 SOUTH SLOPE COOPERATIVE TELEPHONE CO., INC. 0146 PIONEER LONG DISTANCE 5738 SOUTHEAST TELEPHONE, LTD. 0610 PIONEER LONG DISTANCE 6738 SOUTHEASTERN NETWORK SERVICES 0647 PIONEER LONG DISTANCE, INC. 6763 SOUTHERN NEW ENGLAND TELEPHONE (SNET) 0905 PIZZA HUT, INC. 0763 SOUTHERN NEW ENGLAND TELEPHONE (SNET) 6383 PLANET COMMUNICATIONS GROUP 0792 SOUTHTEL CORPORATION 0526 POKA-LAMBRO TELECOMMUNCATIONS, INC. 0793 SOUTHWEST TEXAS COMMUNICATIONS, INC. 0967 POLAR COMMUNICATIONS CORP. 0993 SOUTHWEST UNITED COMMUNICATION,INC 5936 POLLOCK LD SERVICE 5233 SOUTHWESTERN BELL TELEPHONE 0477 POPP TELCOM 5722 SOUTHWESTERN BELL TELEPHONE 5079 PREFERRED CARRIER SERVICES (PCS) 5792 SOUTHWESTERN BELL TELEPHONE 0976 PREFERRED NETWORK 0005 SOUTHWESTERN TELECOM, INC. 0844 PREFERRED TELECOM, INC. 0653 SPECIALIZED TELECOMMUNICATIONS 6339 PREMIER COMMUNICATIONS, INC. 0972 SPECTRANET, INC. 0342 PREMIER LONG DISTANCE SVCS. INC. 6778 SPRING VALLEY TELEPHONE LONG DISTANCE 6767 PREMIERE COMMUNICATIONS 0033 SPRINT 5010 PRE-PAY U.S.A. INC. 0177 SPRINT 5788 PRESTON ENTERPRISE, INC. 0333 SPRINT 5632 PRIME LINE COMMS. dba PRIME LINK LONG DISTANCE, INC. 0777 SPRINT 0954 PRIME TIME COMMUNICATIONS 0872 SPRINT 5683 PRIMETEL COMMUNICATIONS, INC. 0348 SPRINT CANADA, INC. 0024 PRIMUS 0773 SPRINT CANADA, INC. 0776 PRIORITY ONE LONG DISTANCE 5046 SPRINT METROPOLITAN NETWORK, INC. 0673 PRO TAS TELECOMMUNICATIONS 0248 STANDARD COMMUNICATIONS, INC., dba SCI 0726 PROCOM, INC. 0186 STANDARD LONG DISTANCE 5433 PRO-LIFE NETWORK, L.L.C. 0352 STANDARD TELCOM, INC. 0215 PRONTO LONG DISTANCE INC. 0787 STAR TEL OF ABILENE 5536 PRTC COMPETITIVE SVCS. LDC 0983 STAR TEL OF VICTORIA, INC. 0045 PSA, INC. 0984 STAR TEL TRANSMISSION CO., INC. 0249 PSP MARKETING GROUP, INC. 5223 STAR TELECOMMUNICATIONS, INC. 0255 PUBLIC PHONE 0628 STAR TELEPHONE LONG DISTANCE 5847 PUBLIC SERVICE CELLULAR, INC. 0313 STAR TEL, INC. 0830 PUBLIC SERVICE COMPANY OF NM 0439 STAR TEL, INC. 0740 PUBLIC SWITCH CORP. 0195 STARCOM INTERNATIONAL OPTICS CORP.

39 TABLE 5 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 5958 STARGATE COMMUNICATIONS, INC. 0114 TELELINK 0719 STARTEC, INC. 0458 TELEMANAGEMENT CONSULTANTS CORPORATION 0762 STATE OF CALIFORNIA - CALNET 0689 TELEMANAGEMENT CONSULTANTS CORPORATION 5681 STATE OF CA. HEALTH & WELFARE AGENCY DATA CENTER 0887 TELEMANAGEMENT CONSULTANTS CORPORATION 0189 STATE OF TEXAS - GSC 5102 TELENATIONAL COMMUNICATIONS 5327 STATE TELEPHONE LONG DISTANCE 6414 TELENET COMMUNICATIONS 0929 STENOCALL 0759 TELENET COMM. CORP. [SPRINT] 6969 STERLING TELECOMMUNICATIONS, INC. 5864 TELEPACIFIC NETWORK, INC. 0184 STONE & COMPANY 5165 TELEPHONE ASSOCIATES 0577 STRATEGIC ALLIANCES, INC 0219 TELEPHONE BILLING SERVICE 0744 ST. JOE COMMUNICATIONS, INC. 0977 TELEPHONE COMMUNICATIONS CORPORATION 6410 ST. PIERRE COMMUNICATION NETWORK 5111 TELEPHONE ECONOMY LEAGUE 5888 SUMMIT TELESERVICES 0745 TELEPHONE ELECTRONICS NETWORK, LTD. 5914 SUNRISE OPERATOR 0899 TELEPHONE EXPRESS 0784 SUNSHINE TELEPHONE, INC. dba SUNTEL 0961 TELEPHONE SYSTEMS OF GEORGIA 6565 SWISHER TELEPHONE COMPANY 6111 TELEPOOL NETWORK, INC. 0727 SWITCH 2000, INC. 0731 TELESCAN, INC. 0948 SWITCHED SERVICE COMMUNICATIONS 0380 TELESERV CORPORATION 0666 SYSTEMS 1000 0602 TELESERVE COMMUNICATIONS 6666 S.F.C. ENTERPRISES 0482 TELE-SYS, INC. 5692 TACONIC TELCOM CORP. 0409 TELEVOX PUBLIC COMMUNICATIONS, INC. 0849 TALTON TELECOMMUNICATIONS CORP. 0116 TELNET GLOBAL COMMUNICATIONS 0110 TANDEM ACCESS FOR DATABASE QUERY 0296 TELNEX, INC. 0214 TCA COMMUNICATIONS 0626 TEL-ONE 0669 TCA LONG DISTANCE 0489 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 5227 TCAST COMMUNICATIONS, INC. 0587 TEL-OPTIC, INC. dba UNIVERSAL NETWORK SVCS. (UNI-NET) 0292 TCG 5112 TELSCAPE INTERNATIONAL, INC. 0560 TCI COMMUNICATIONS, INC. 0330 TEL-SHARE 0883 TEASE COMMUNICATIONS 0520 TEL-SPAN COMMUNICATIONS, INC. 0476 TEK COMMUNICATIONS, INC. 0485 TELTRUST, INC. 0700 TEL AMERICA 0707 TELVUE CORPORATION 0709 TEL AMERICA 0331 TEXUSTEL, INC. 0729 TEL AMERICA 6253 THE BENTLEYVILLE LONG DISTANCE COMPANY 0269 TEL AMERICA L.D.T.S. 0268 THE COMMUNIGROUP 0919 TEL NET,INC. 0885 THE COMMUNIGROUP OF KC 0378 TEL SERV 0998 THE COMMUNIGROUP OF KC 0397 TELALEASING ENT.INC dba PHONE ZONE INC. 5100 THE CORCORAN GROUP 0007 TELAMARKETING COMMUNICATIONS INC. 5014 THE FURST GROUP, INC. 0749 TELAMERICA COMMUNICATIONS, INC. 5608 THE LONG DISTANCE PARTNERSHIP, L.P. 5522 TELAPEX LONG DISTANCE, INC. 0798 THE PAY TELEPHONE COMPANY 0218 TEL-CENTRAL OF JEFFERSON CITY 6746 THE PHONE COMPANY 0457 TELCO COMMUNICATIONS GROUP dba DIAL & SAVE 0896 THE REAL PUBLIC TELEPHONE COMPANY, INC. 0399 TELCO HOLDINGS, INC. 6150 THE SAN DIEGO TELEPHONE COMPANY 0861 TELCO HOLDINGS, INC. 0385 THE SWITCHBOARD 5258 TELCOM NETWORK, INC. (TNI) 5882 THE TELEPHONE CONNECTION OF L.A., INC. 0149 TEL-COM TELECOMMUNICATIONS, INC. 6887 THE TELEPHONE CONNECTION OF L.A., INC. 0915 TELE TECH, INC. 5106 THE V.I.P. PHONE CLUB, INC. 5646 TELEBERMUDA INTERNATIONAL LIMITED (TBI) 5728 THRIF-TCOMM 0845 TELECABLE CORPORATION 0923 THRIFTY CALL, INC. 5125 TELECARE, INC. 5892 TIME WARNER 5874 TELECARRIER SERVICES, INC. 6892 TIME WARNER 5555 TELECOM ONE 0384 TLD, INC. 0529 TELECOM WEST 0016 TMC LONG DISTANCE dba CHERRY COMMUNICATIONS, INC. 0042 TELECOMMUNICATION SYSTEMS 0019 TMC LONG DISTANCE dba CHERRY COMMUNICATIONS, INC. 0029 TELECOMMUNICATIONS CONSULTANTS, INC. 0462 TMC OF LEXINGTON 5617 TELECOMMUNICATIONS CORPORATION OF AMERICA (TCA) 0566 T-NET 0641 TELECOMMUNICATIONS SERVICE CENTER, INC. 5869 T-NETIX, INC. 0087 TELECOM*USA [MCI] 0655 T-NETIX, INC. 0220 TELECOM*USA [MCI] 0864 T-ONE COMMUNICATIONS CO. 0224 TELECOM*USA [MCI] 6964 TOTAL TELECOMMUNICATIONS SVCS., INC. 0321 TELECOM*USA [MCI] 0664 TOTAL TELEPHONE, INC. OF UTAH 0771 TELECOM*USA [MCI] 0612 TOTAL WORLD TELECOM 0826 TELECOM*USA [MCI] 0346 TOTALNET COMMUNICATIONS, INC. 0832 TELECOM*USA [MCI] 0081 TOTAL-TEL USA, INC. 0835 TELECOM*USA [MCI] 0534 TOUCH 1 COMMUNICATIONS 0852 TELECOM*USA [MCI] 0335 TOUCH AMERICA, INC. 0857 TELECOM*USA [MCI] 0360 TOUCH AMERICA, INC. 0876 TELECOM*USA [MCI] 0994 TOUCH AMERICA, INC. 0518 TELECON COMMUNICATIONS CORPORATION 5656 TOUCH TONE AMERICA, INC. 0985 TELECORP INTERNATIONAL 5981 TRANS GLOBAL COMMUNICATIONS, INC. 6060 TELEC, INC. 0140 TRANS NATIONAL COMMUNICATIONS, INC. 0481 TELEDATA INTERNATIONAL, INC. 5256 TRANSACT DATA SERVICES, INC. 0547 TELEFONICA LARGA DISTANCIA 0522 TRANSACTION NETWORK SERVICES 6333 TELEGLOBE USA, INC. 0593 TRANSACTION NETWORKS, INC. 0609 TELEGLOBE USA, INC. 0494 TRANSAMERICA COMMUNICATIONS, INC. 0630 TELEGROUP 5317 TRANS-WORLD TELECOM 0620 TELEHOP COMMUNICATIONS, INC. 5200 TREAS RESOURCES INTL. CORP. dba TRI COMMS. NETWORK 6444 TELEHUB COMMUNICATIONS CORPORATION 0097 TRESCOM PUERTO RICO

40 TABLE 5 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 0848 TRESCOM U.S.A., INC. 5885 VIATEL, INC. 0394 TRESCOM U.S.A., INC./TRESCOM CARIBBEAN 6885 VIDEOTRON TELECOM LTEE. 5252 TRI-COUNTY LONG DISTANCE 0847 VIP CONNECTIONS, INC. 6611 TRINET 0466 VIRGIN ISLANDS TELE-COM 0120 TRT TELECOMMUNICATIONS CORPORATION 0480 VISTA GROUP INTERNATIONAL 0461 TTE OF CHARLESTON 0939 VISTA-UNITED TELECOMMUNICATIONS 0578 TTI TELECOMMUNICATIONS, INC. 5924 VIVA TEL LONG DISTANCE 0009 TWT-HEARTLINE 0721 VOICE TECHNICAL CORPORATION 0067 T.B. ENTERPRISES 5841 VOICE TRACK CORPORATION 0229 U S COMNET 5853 VOLCANO LONG DISTANCE 5005 U S TELESERVICES, INC. 0979 VORTEL COMMUNICATIONS, INC. 5123 U S WEST COMMUNICATIONS 0426 VOYAGER NETWORKS, INC. 5923 U SPEAK LONG DISTANCE 0903 VRS BILLING SYSTEMS, INC. 5957 UNI DIAL 0041 VTA, INC. 5450 UNICOM, INC. 5946 WABASH INDEPENDENT NETWORKS 0855 UNION TELEPHONE COMPANY 0981 WARWICK VALLEY LONG DISTANCE CO., INC. 5775 UNION TELEPHONE CO. 6981 WARWICK VALLEY TELEPHONE CO. 0823 UNITED BANK OF DENVER 6161 WATS INTERNATIONAL CORPORATION 0032 UNITED COMMUNICATIONS ASSN., INC. 0677 WATS/800, INC. 0955 UNITED COMMUNICATIONS, INC. 0753 WAUSAU LONG DISTANCE SERVICE 0544 UNITED TELEPHONE CO. dba TELAMERICA L.D. 0176 WBC COMMUNICATIONS, INC. 0204 UNITED TELEPHONE LONG DISTANCE 0712 WCS/DIAL ONE 0907 UNI-TEL OF FARMINGTON 6699 WCTC ALL DISTANCE 0347 UNIVERSAL LONG DISTANCE, INC. 5057 WEBSTER-CALHOUN LONG DISTANCE (WEB-CAL LD) 5510 UNIVERSAL TELECOM, INC. 5022 WEEKS COMMUNICATIONS, INC. 0973 UNIVERSAL TELEPHONE & TELEGRAPH 0052 WEST COAST TELECOMMUNICATIONS, INC. 5430 URSUS TELECOM CORP. 0569 WEST COAST TELECOMMUNICATIONS, INC. 0879 US COMMUNICATIONS,INC. 0582 WEST INTERACTIVE GROUP 0568 US COMM. INC, dba SOUTHWEST L.D.N, INC. 5655 WEST RIVER LONG DISTANCE 0668 US FIBERCOM NETWORK, INC. 0459 WESTCOM LONG DISTANCE 5230 US LEC OF NORTH CAROLINA, L.L.C. 0938 WESTCOM, INC. (WESTERN TELECOM, INC.) 5008 US ONE COMMUNICATIONS CORP. 0978 WESTEL TELECOMMUNICATIONS, LTD. 0040 US SIGNAL CORPORATION 0085 WESTEL, INC. 0699 US TELESERVICES, INC. 0090 WESTEL, INC. 5878 US VOICE TELEMANAGEMENT, INC. 0443 WESTERN OKLAHOMA INFORMATION SYSTEMS 0200 US WATS 0957 WESTERN TELECOMMUNICATION, INC. (WTCI) 5845 USA GLOBAL LINK 0427 WESTERN TELECOM, INC. 6872 USA PAGING 0431 WESTERN TELENET, INC. 0228 USLINK LONG DISTANCE 0301 WESTERN TELEPHONE & TELEVISION 0381 USN COMMUNICATIONS 5672 WESTINGHOUSE ELECTRIC CORPORATION 0474 USN COMMUNICATIONS 5673 WESTINGHOUSE ELECTRIC CORPORATION 0131 USP&C, INC. 0946 WESTINGHOUSE ELECTRIC CORPORATION 0172 USP&C, INC. 5938 WEYMOUTH SERVICE 0074 USTEL 0524 WHITMAN COLLEGE 6853 UTC LONG DISTANCE, L.L.C. 5138 WHO EVER 0851 UTEL-CALL 0367 WHOLESALE COMMUNICATIONS 0355 U. S. LINK 0877 WILLAMETTE VALLEY TELECOM 0596 U.S. ADVANTAGE LONG DISTANCE 5054 WILTON LONG DISTANCE 5982 U.S. AMERITEL 5277 WILTON TELEPHONE COMPANY 5969 U.S. CELLULAR CORP. 6105 WINNEBAGO COOPERATIVE TELEPHONE ASSOC. (WCTA) 0574 U.S. CONNECT CORP. 5175 WINSTAR 0941 U.S. FIBERCOM 0643 WINSTAR 0030 U.S. LONG DISTANCE, INC. 5918 WISTERIA LD SERVICE 0070 U.S. LONG DISTANCE, INC. 0718 WKP, INC. 0556 U.S. LONG DISTANCE, INC. 5203 WOODBURY TELEPHONE COMPANY 0271 U.S. NETWORK 0649 WORKING ASSETS 0298 U.S. NET, INC. 0842 WORLD ACCESS COMMUNICATIONS CORP. (WACC) 5972 U.S. ROBOTICS 5266 WORLD LINK, INC. 5877 U.S. SOUTH COMMUNICATIONS, INC. 0840 WORLD PASS COMMUNICATIONS CORP. 0396 U.S. TELE-COMM, INC. 5978 WORLD TELECOMMUNICATIONS SERVICES, INC. 0576 U.S.FIBERLINE COMMUNICATIONS, INC. 5254 WORLD WIDE CONNECT, INC. 0878 VALLEY STAR-TEL 5916 WORLD WINDOW 0010 VALLEY TELEPHONE LONG DISTANCE 6788 WORLDCALL COMMUNICATIONS INTERNATIONAL, INC. 5523 VALUE TEL 0001 WORLDCOM, INC. 0817 VALUE-ADDED COMMUNICATIONS 0002 WORLDCOM, INC. 5759 VALULINE LONG DISTANCE 0006 WORLDCOM, INC. 0662 VALULINE LONG DISTANCE 0008 WORLDCOM, INC. 0678 VALU-LINE OF KANSAS, INC. 0011 WORLDCOM, INC. 0859 VALU-LINE OF LONGVIEW, INC. 0021 WORLDCOM, INC. 0889 VALU-LINE OF ST. JOSEPH 0031 WORLDCOM, INC. 5826 VANCOUVER TELEPHONE COMPANY LTD. 0050 WORLDCOM, INC. 0636 VARTEC TELECOM dba CLEAR CHOICE COMMUNICATIONS 0053 WORLDCOM, INC. 0595 VARTEC TELECOM, INC. 0055 WORLDCOM, INC. 0811 VARTEC TELECOM, INC. 0080 WORLDCOM, INC. 0818 VARTEC TELECOM, INC. 0084 WORLDCOM, INC. 0275 VEND-TEL-CO., LTD. 0142 WORLDCOM, INC. 0674 VENSER, INC. 0208 WORLDCOM, INC. 5915 VERA LONG DISTANCE 0212 WORLDCOM, INC.

41 TABLE 5 LIST OF FGD CIC CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO 0217 WORLDCOM, INC. 0237 WORLDCOM, INC. 0246 WORLDCOM, INC. 0250 WORLDCOM, INC. 0254 WORLDCOM, INC. 0263 WORLDCOM, INC. 0266 WORLDCOM, INC. 0267 WORLDCOM, INC. 0274 WORLDCOM, INC. 0290 WORLDCOM, INC. 0311 WORLDCOM, INC. 0312 WORLDCOM, INC. 0315 WORLDCOM, INC. 0353 WORLDCOM, INC. 0406 WORLDCOM, INC. 0408 WORLDCOM, INC. 0421 WORLDCOM, INC. 0428 WORLDCOM, INC. 0442 WORLDCOM, INC. 0446 WORLDCOM, INC. 0450 WORLDCOM, INC. 0453 WORLDCOM, INC. 0456 WORLDCOM, INC. 0464 WORLDCOM, INC. 0471 WORLDCOM, INC. 0488 WORLDCOM, INC. 0523 WORLDCOM, INC. 0535 WORLDCOM, INC. 0538 WORLDCOM, INC. 0546 WORLDCOM, INC. 0555 WORLDCOM, INC. 0588 WORLDCOM, INC. 0589 WORLDCOM, INC. 0683 WORLDCOM, INC. 0724 WORLDCOM, INC. 0733 WORLDCOM, INC. 0737 WORLDCOM, INC. 0738 WORLDCOM, INC. 0741 WORLDCOM, INC. 0742 WORLDCOM, INC. 0751 WORLDCOM, INC. 0782 WORLDCOM, INC. 0786 WORLDCOM, INC. 0789 WORLDCOM, INC. 0797 WORLDCOM, INC. 0800 WORLDCOM, INC. 0801 WORLDCOM, INC. 0824 WORLDCOM, INC. 0846 WORLDCOM, INC. 0862 WORLDCOM, INC. 0868 WORLDCOM, INC. 0874 WORLDCOM, INC. 0884 WORLDCOM, INC. 0895 WORLDCOM, INC. 0910 WORLDCOM, INC. 0911 WORLDCOM, INC. 0918 WORLDCOM, INC. 0921 WORLDCOM, INC. 0951 WORLDCOM, INC. 0953 WORLDCOM, INC. 0969 WORLDCOM, INC. 0987 WORLDCOM, INC. 0995 WORLDCOM, INC. 0999 WORLDCOM, INC. 0502 WORLDXCHANGE 0629 WORLDXCHANGE 0781 WXL COMMUNICATIONS, LTD. 5062 XCOM TECHNOLOGIES 6942 XIT COMMUNICATIONS 0736 XNET, INC. 0483 XPEDITE SYSTEMS, INC. 0924 XTEL 6678 XTRACOM, INC. 0766 YAVAPAI TELEPHONE EXCHANGE 5999 ZENEX LONG DISTANCE, INC. 0756 ZEROPLUS DIALING, INC. 5933 ZIMMER WAY

42 TABLE 6 500 CODE BALANCE SHEET (AS OF MARCH 31, 1997)

NUMBER CODES OF CODES

ASSIGNED TO: BELL OPERATING COMPANIES 26 SPRINT OPERATING COMPANIES 18 CANADIAN CARRIERS 30 OFFSHORE AND CARIBBEAN CARRIERS 4 AT&T 87 MCI 10 310 OTHER COMPANIES 345

CODES NOT USABLE (211, 311, ETC.) 8 CODES NOT USED FOR 500 SERVICE (000-199) 200 CODE RESERVED FOR DIRECTORY ASSISTANCE (555) 1 CODES RESERVED FOR CANADIAN USE 49 RESERVED CODES 10 UNASSIGNED CODES 212

TOTAL 1,000

TABLE 7 NUMBER OF 500 CODES ASSIGNED

CODES TOTAL CODES YEAR ASSIGNED ASSIGNED DURING AT END QUARTER OF QUARTER

1994 3RD QUARTER 116 116 4TH QUARTER 163 279

1995 1ST QUARTER 66 345 2ND QUARTER 25 370 3RD QUARTER 60 430 4TH QUARTER 26 454

1996 1ST QUARTER 18 472 2ND QUARTER - 472 3RD QUARTER 3 475 4TH QUARTER 2 476

1997 1ST QUARTER 61 520

43 TABLE 8 LIST OF 500 CODE ASSIGNMENTS SORTED BY CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 200 WKP, INC. 276 LDDS WORLDCOM 201 INTERNATIONAL PRIVATE ACCESS 277 ARCH COMMUNICATIONS GROUP, INC. 202 ALLTEL SERVICE CORP. 278 CN COMMUNICATIONS 206 COOK TELECOM, INC. 279 ARCH COMMUNICATIONS GROUP, INC. 207 AT&T 280 SPRINT / UNITED TELEPHONE OF MINNESOTA 208 AT&T 281 COLUMBUS TELEPHONE COMPANY, INC. 209 AT&T 282 U.S. WEST NEWVECTOR GROUP, INC. 210 AT&T 283 CENTURY TELEPHONE ENTERPRISES, INC. 212 AT&T 284 BTI 213 AT&T 285 OREGON FARMERS MUTUAL TELEPHONE CO. 214 AT&T 286 SPRINT / CENTRAL TELEPHONE - NEVADA 215 AT&T 287 LDDS WORLDCOM 216 AT&T 288 AT&T 217 AT&T 289 PACIFIC BELL MOBILE SERVICES 218 AT&T 290 LAHARPE TELEPHONE COMPANY, INC. 219 AT&T 291 LAKEDALE TELEPHONE COMPANY 220 DIAL CALL, INC. 292 BRAZORIA TELEPHONE COMPANY 221 MICROCELL 1-2-1 293 AT&T 222 WHIDBEY TELEPHONE CO. 294 CABLE & WIRELESS, INC. 223 CABLE & WIRELESS, INC. 295 AT&T 224 BELL ATLANTIC NETWORK SERVICES 296 AT&T 225 TIME WARNER TELECOMMUNICATIONS 297 AT&T 226 BELL ATLANTIC MOBILE 298 AT&T 227 AMERITECH MOBILE COMMUNICATIONS, INC. 299 NYNEX MOBILE COMMUNICATIONS CO. 228 CINCINNATI BELL TELEPHONE 300 DELTACOM, INC. 229 CABLE & WIRELESS, INC. 302 MORRIS COMMUNICATIONS, INC. 230 PCC MANAGEMENT 303 BELL MOBILITY 231 PCC MANAGEMENT 304 CHESTER TELEPHONE COMPANY 232 NEXTEL COMMUNICATIONS, INC. 305 OMNI III CABLE T.V., INC. 233 COLONIAL COMMUNICATION SYSTEMS, INC. 306 SASKTEL MOBILITY 234 SWAYZEE TELEPHONE BROADBAND, INC. 315 SCHERERS COMMUNICATIONS GROUP, INC. 235 TRIAD MINNESOTA CELLULAR L. P. 316 CRUISEPHONE, INC. 236 NORTHEAST TELEPHONE COMPANY 320 SPRINT / UNITED TELEPHONE OF MISSOURI 237 OPERATOR SERVICE COMPANY 321 MICROCELL 1-2-1 238 ADVANCED RADIO TECHNOLOGIES CORP. 323 SCHNEIDER COMMUNICATIONS, INC. 239 BENTLEYVILLE TELEPHONE COMPANY 324 MANKATO CITIZENS TELEPHONE CO. 240 CENTENNIAL CELLULAR CORPORATION 325 PENNSYLVANIA TELEPHONE CO. 241 VANGUARD CELLULAR SYSTEMS, INC. 326 OMAHA CELLULAR LIMITED PARTNERSHIP 242 ROCK HILL TELEPHONE COMPANY 327 STARTEC, INC. 243 NPB TELECOM 328 BC TEL MOBILITY CELLULAR, INC. 244 TELEPHONE ELECTRONICS 329 CMT PARTNERS 245 BUDGET CALL LONG DISTANCE, INC. 332 FREEMAN ENGINEERING ASSOCIATES, INC. 246 WINSTAR 334 THE PINE TREE TELEPHONE & TELEGRAPH CO. 247 UNITED STATES CELLULAR CORPORATION 337 VENTURES IN PAGING 249 SPRINT / CAROLINA TELEPHONE 338 PAGEX COMPANY 250 EASTERN TELECOM 340 SPRINT / UNITED TELEPHONE OF NEBRASKA 251 PARALLAX, INC. 342 PACIFIC BELL MOBILE SERVICES 252 BERMUDA TELEPHONE COMPANY, LTD. 343 VALU-LINE OF KANSAS, INC. 253 CONCORD TELEPHONE COMPANY 344 ALL CITY PAGING 254 SPRINT / UNITED TELEPHONE OF TENNESSEE 345 LOS ANGELES CELLULAR TELEPHONE COMPANY 255 VBI, INC. 346 AT&T 256 ALLNET COMMUNICATION SERVICES, INC. 347 EASTERN TELELOGIC CORP. 257 BELLSOUTH TELECOMMUNICATIONS, INC. 348 COM NET, INC. 258 BELL ATLANTIC MOBILE 349 OMEGA CELLULAR PARTNERS, L.C. 259 SPRINT / UNITED TEL. OF SOUTH CAROLINA 350 RESPONSE TELEMEDIA 260 MINNESOTA RSA 10 LIMITED PARTNERSHIP 352 JEROME FREUND 261 AMERITECH COMMUNICATIONS INC. (ACI) 353 FRONTIER COMMUNICATIONS INTERNATIONAL, INC. 262 ALLTEL MOBILE COMMUNICATIONS 354 HINTON TELEPHONE COMPANY 263 AT&T 356 TDS TELECOM 264 BELLSOUTH WIRELESS, INC. 357 PAGING SYSTEMS, INC. 265 MCI 359 AT&T 266 QUALICOM, INC. 362 SWAYZEE TELEPHONE COMPANY, INC. 267 BEGGS TELEPHONE COMPANY 364 DIGITAL NETWORK, INC. 268 CONQUEST COMMUNICATIONS CORP. 365 U.S. ADVANTAGE LONG DISTANCE, INC. 269 AMERITECH MOBILE COMMUNICATIONS, INC. 367 AT&T 272 AMERICAN PCS, L.P. dba APC 368 PAGING SYSTEMS, INC. 273 BATON ROUGE CELLULAR TELEPHONE CO. 369 BELL ATLANTIC NETWORK SERVICES 274 AMERICAN PAGING, INC. 370 HIAWATHALAND CELLULAR LIMITED PARTNERSHIP 275 PAGEMART, INC. 371 AT&T

44 TABLE 8 LIST OF 500 CODE ASSIGNMENTS--CONTINUED SORTED BY CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 372 OT&T COMMUNICATIONS, INC. 477 PCS PRIMECO 373 PACIFIC BELL MOBILE SERVICES 478 ALASCOM, INC. 374 PIONEER LONG DISTANCE, INC. 479 GRANITE STATE TELEPHONE, INC. 375 PIONEER TELEPHONE COOP., INC. (OKLAHOMA) 480 GTE MOBILE COMMUNICATIONS 376 INFONET LONG DISTANCE, L.L.C. 481 AT&T 377 CENTRAL OKLAHOMA TELEPHONE COMPANY 482 COMMUNITY SERVICE TELEPHONE 378 WEST LIBERTY TELEPHONE COMPANY 483 GTE TELEPHONE OPERATIONS 380 DAKOTA CELLULAR, INC. 484 TELECOM*USA 382 ELKHART TELEPHONE CO. 485 AT&T 383 ATLANTIC CELL. CO., L.P. dba ATLANTIC LONG DISTANCE 486 EGYPTIAN TELEPHONE COOPERATIVE ASSN. 384 TELECALL LONG DISTANCE, INC. 487 U.S. INTELCO NETWORKS, INC. 385 GRAND TELEPHONE COMPANY, INC. 488 AT&T 386 JEFFERSON TELEPHONE COMPANY 489 AT&T 387 VI-TEL, INC. 490 AT&T 388 AT&T 491 AT&T 389 AT&T 492 ARMOUR INDEPENDENT TELEPHONE CO. 390 AT&T 493 AT&T 391 AT&T 494 AT&T 392 AT&T 495 MID-COM COMMUNICATIONS, INC. 393 CABLEVISION SYSTEM CORPORATION 496 AT&T 400 AIRTOUCH COMMUNICATIONS 497 AT&T 404 COMMUNICATIONS INNOVATIONS CORP. 498 AT&T 405 TRIAD OKLAHOMA CELLULAR L.P. 499 CAL-ONE CELLULAR, L.P. 414 HEBENSTREIT COMMUNICATIONS CORP. 500 COMTECH INC. 415 CORPORATE TECHNOLOGY PARTNERS (CTP) 501 AT&T 423 TRI COUNTY TELEPHONE COMPANY, INC. 502 AT&T 424 GCI CORPORATION 503 AWESOME PAGING, INC. 425 GLACIAL LAKE CELLULAR LIMITED PARTNERSHIP 504 AT&T 426 WIRELESS ONE NETWORK 505 SOUTHWESTERN BELL TELEPHONE CO. 427 WABASH TELEPHONE COOPERATIVE, INC. 506 SOUTHWESTERN BELL TELEPHONE CO. 428 RINGGOLD TELEPHONE COMPANY 507 SOUTHWESTERN BELL TELEPHONE CO. 429 NORTH COUNTY COMMUNICATIONS CORP. 508 SOUTHWESTERN BELL TELEPHONE CO. 430 AT&T 509 AT&T 431 AT&T 510 ONECOMM COMMUNICATIONS CORPORATION 432 AT&T 512 AT&T 433 AT&T 513 AT&T 434 CHEROKEE TELEPHONE CO. 514 AT&T 435 RURAL CELLULAR CORPORATION 515 FRONTIER LONG DISTANCE OF AMERICA, INC. 436 GEOTEK COMMUNICATIONS, INC. 516 AT&T 437 AT&T 517 AT&T 438 ACCESSLINE TECHNOLOGIES, INC. 518 AT&T 439 KALIDA TELEPHONE COMPANY, INC. 519 AT&T 441 NORTHEAST CELLULAR TELEPHONE COMPANY 520 AT&T 442 AT&T 521 WOOD COUNTY TELEPHONE COMPANY 443 AT&T 522 STANDISH TELEPHONE CO. 444 ONCOR COMMUNICATIONS, INC. 523 AT&T 445 AT&T 524 LCI INTERNATIONAL, INC. 446 AT&T 525 EASTERN TELECOM 447 AT&T 526 POKA LAMBRO COMMUNICATIONS 448 AT&T 527 SHERBURNE LONG DISTANCE 449 AT&T 528 LUFKIN-CONROE TELEPHONE EXCHANGE 450 USLINK, INC. 529 UNITED STATES CELLULAR CORPORATION 452 MCCLURE TELEPHONE COMPANY 532 EGYPTIAN COMMUNICATION SERVICES, INC. 453 SPECTRANET, INC. 533 MCI 454 WIRELESS ONE NETWORK 534 OK CELL., MANAGING PARTNER FOR OK RSA 6 PARTNERSHIP 455 TELECONCEPTS, INC. dba TELEPHONE EXPRESS 535 HORRY TELEPHONE COOPERATIVE 456 UNICOM CORPORATION (SOUTH CAROLINA) 536 CAMERON COMMUNICATIONS CORPORATION 462 FLAT ROCK TELEPHONE COOPERATIVE, INC. 537 COMMUNICATION TELESYSTEMS INTERNATIONAL (CTS) 463 CROSS TELEPHONE COMPANY 538 NORTH COUNTRY TELEPHONE COMPANY 464 INTELLICOM 539 WINN TELEPHONE COMPANY 465 THE SYCAMORE TELEPHONE COMPANY 540 CALL ONE, INC. 466 FRONTIER COMMUNICATIONS OF MID ATLANTIC, INC. 542 BETTLES TELEPHONE COMPANY 467 ACC CORP. 543 PAGEMART, INC. 468 INTERELECTRONICS CORPORATION 544 UTILITIES, INC. 469 BT TELECOM, INC. 545 GST CALL AMERICA 472 SHOREHAM TELEPHONE COMPANY, INC. 546 TELECOMMUNICATIONS PREMIUM SERVICES 473 LENNON TELEPHONE COMPANY 547 LIBERTY CELLULAR, INC. 474 FISHERS ISLAND TELEPHONE 548 COMPUCELL, INC. 476 CIMMARON TELEPHONE CO. 550 MCI

45 TABLE 8 LIST OF 500 CODE ASSIGNMENTS--CONTINUED SORTED BY CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 551 MCI 673 AT&T 552 MCI 674 AT&T 553 MCI 675 AT&T 554 IAN, INC. 676 NORCOM NETWORKS CORPORATION 556 WILKES TELEPHONE & ELECTRIC COMPANY 677 AT&T 557 AIR CELL, INC. 678 NYNEX MOBILE COMMUNICATIONS CO. 558 JSM TELE-PAGE, INC. 679 AT&T 562 POTTAWATOMIE TELEPHONE CO. 682 NATIONAL TELEPHONE OF ALABAMA, INC. 563 OKLAHOMA WESTERN TELEPHONE COMPANY 684 PTI COMMUNICATIONS, INC. 564 ADAMS TELSYSTEMS, INC. 687 MTS MOBILITY 566 ROSEVILLE TELEPHONE COMPANY 688 MT&T MOBILITY 567 PEOPLES TELEPHONE COMPANY 690 PILGRIM TELEPHONE COMPANY 568 THE FORT JENNINGS TELEPHONE COMPANY 691 MOBILETEL, INC. 569 SNET MOBILECOM, INC 692 COMMUNICATION OPTIONS, INC. (FLORIDA) 577 LANSER PERSONAL COMMUNICATIONS 693 LAFOURCHE TELEPHONE COMPANY, INC. 581 LDDS WORLDCOM 696 ADAMS TELEPHONE CO-OPERATIVE 582 INTERNATIONAL SATELLITE INTEGRATION SVCS., INC. 699 NYNEX 583 AT&T 700 AIRTOUCH COMMUNICATIONS 584 AT&T 720 SOUTHWESTERN BELL MOBILE SYSTEMS 585 PACIFIC TELECOM CELLULAR, INC. 721 SOUTHWESTERN BELL MOBILE SYSTEMS 586 AT&T 722 SOUTHWESTERN BELL MOBILE SYSTEMS 587 HUTCHINSON TELEPHONE COMPANY 723 RADIOFONE, INC. 588 LINCOLN TELEPHONE AND TELEGRAPH 724 PITTENCRIEFF COMMUNICATIONS, INC. 589 AT&T 725 PITTENCRIEFF COMMUNICATIONS, INC. 600 AIRTOUCH COMMUNICATIONS 726 OMNIPOINT CORPORATION 610 ADVANCED TELECOM SERVICES, INC. 728 COMSAT CORP. 612 BAY STAR COMMS. dba BAY STAR SATELLITE COMMS. 729 SPRINT / UNITED TELEPHONE OF PENNSYLVANIA 614 SPRINT CELLULAR COMPANY 730 CELLULAR 7 PARTNERSHIP 620 TRILLIUM CELLULAR CORP. 732 LDDS WORLDCOM 622 MAINSTREET COMMUNICATIONS 733 RED ROSE COMMUNICATIONS, INC. 623 WMW CABLE TV COMPANY 734 ISLAND TEL MOBILITY 624 OMNIPOINT CORPORATION 735 NEWTEL MOBILITY 625 CMT PARTNERS 736 CANADIAN VALLEY TELEPHONE COMPANY 626 PARKWAY COMMUNICATIONS, INC. 737 PAGENET 627 CLEARTEL COMMUNICATIONS 738 PAGENET 628 NB TEL MOBILITY 739 INTERNATIONAL TELESERVICES LTD 629 HAMILTON TELEPHONE COMPANY 740 AT&T 630 AMERICAN PORTABLE TELECOM 741 CELLULAR HOLDING, INC. 632 NATIONAL DISPATCH CENTER 742 BIXBY TELEPHONE COMPANY 635 AT&T 743 CIM-TEL CABLE, INC. 636 AMERICAN PCS, L.P. dba APC 744 CROSS CABLE TELEVISION 637 TC - SYSTEMS 745 SHENANDOAH TELEPHONE COMPANY 638 NEW CELL, INC. 746 AMERITECH MOBILE COMMUNICATIONS, INC. 639 NEXTEL COMMUNICATIONS, INC. 747 GENESEO TELEPHONE COMPANY 641 DEADWOOD CELLULAR 748 KALEVA TELEPHONE COMPANY 642 JEFFERSON TELEPHONE CO. 749 DURANGO CELLULAR TELEPHONE CO. 644 BN1 TELECOMMUNICATIONS, INC. 752 POINT TELESYSTEMS, INC. 645 CITIZENS TELEPHONE COMPANY (GA) 753 COMCAST CELLULAR COMMUNICATIONS, INC. 646 REDWOOD COUNTY TELEPHONE COMPANY 754 TWO WAY RADIO OF CAROLINA, INC. 647 UNION TELEPHONE COMPANY (SD) 755 UNITED STATES CELLULAR CORPORATION 650 CHAMPAIGN TELEPHONE CO. 756 POKA LAMBRO COMMUNICATIONS 651 SPRINT / UNITED TELEPHONE OF NEW JERSEY 757 SPRINGWICH CELLULAR LIMITED PARTNERSHIP 652 COBBOSSEECONTEE TELEPHONE & TELEGRAPH 758 AMSC SUBSIDIARY CORPORATION 653 BARAGA TELEPHONE CO. 760 AMSC SUBSIDIARY CORPORATION 654 HOOPER TELEPHONE COMPANY 761 TMI COMMUNICATIONS 655 AMERICAN SHARECOM, INC. 762 RESERVE COMMUNICATIONS & COMPUTER CORP. 656 CITIZENS TELEPHONE CO. OF KECKSBURG 763 SNET CO. 657 NATIONAL TELECOMMUNICATIONS OF FLORIDA, INC. 764 PREFERRED NETWORKS, INC. 658 SOUTH HOLT CABLEVISION, INC. 765 HARMONY TELEPHONE COMPANY 659 COLUMBUS GROVE TELEPHONE COMPANY 766 FCCA, L.L.C. 661 AMERITECH MOBILE COMMUNICATIONS, INC. 767 ED TEL MOBILITY 662 ROGERS CANTEL MOBILE INC. 768 HARMONY CABLE, INC. 663 AT&T 769 OHIO STATE CELLULAR PHONE COMPANY, INC. 664 AT&T 770 VIRGIN ISLANDS TELEPHONE CORPORATION 665 AT&T 771 STRATEGIC PRODUCTS CORPORATION 666 NATIONWIDE WIRELESS NETWORK 772 MESSAGE CENTER USA 667 CHILLICOTHE TELEPHONE COMPANY 773 ADAMS CELLULAR, INC. 668 MOBILECOM ONE, LLC 774 SNET PAGING, INC. 672 AT&T 775 SEVEN SEAS COMMUNICATIONS, INC.

46 TABLE 8 LIST OF 500 CODE ASSIGNMENTS--CONTINUED SORTED BY CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 776 AT&T 884 SPRINT / UNITED TELEPHONE OF INDIANA 777 COMCAST CELLULAR COMMUNICATIONS, INC. 885 SPRINT / UNITED TELEPHONE CO. OF KANSAS 778 FROMM SERVICES, INC. dba THE AN-SER SYSTEM 886 SPRINT / UNITED TELEPHONE COMPANY OF OHIO 779 PUERTO RICO TELEPHONE COMPANY 887 TELECOM*USA 782 ROANOKE TELCO 888 METROCALL, INC. 783 STEELVILLE TELEPHONE EXCHANGE, INC. 889 TELECOM*USA 784 RAM TECHNOLOGIES 892 EVANS TELEPHONE CO. 785 AT&T 898 AIR PAGE CORPORATION 786 SPRINT / UNITED TELEPHONE OF FLORIDA 900 TELEZONE CORPORATION 787 FIRSTPAGE USA 907 GCI CORPORATION 788 SPRINT / UNITED TELEPHONE CO. OF TEXAS 909 PILGRIM TELEPHONE COMPANY 789 WEST IOWA TELEPHONE COMPANY 925 WINCEL CELLULAR CORPORATION 792 CAMPTI - PLEASANT HILL TELEPHONE CO., INC. 926 ZENEX LONG DISTANCE 800 AIRTOUCH COMMUNICATIONS 927 OKLAHOMA RSA 2-PIONEER CELL., MANAGING PARTNER 801 TRIAD UTAH CELLULAR L.P. 928 CHOCTAW TELEPHONE COMPANY 806 TRIAD TEXAS CELLULAR L.P. 932 ENID CELLULAR 807 AT&T 936 OLD SPA SHOP ANTIQUES 808 PAC-WEST TELECOMM, INC. dba AMERICALL 937 U.S. INTELCO NETWORKS, INC. 813 PINE BELT TELEPHONE CO., INC. dba PBC L.D. 938 WKP, INC. 818 VARTEC TELECOM 943 CONSOLIDATED TELCO INC. 822 ONEONTA TELEPHONE CO. 945 LDDS WORLDCOM 823 TRI-TOUCH AMERICA 946 SPRINT / CENTEL OF NORTH CAROLINA 824 TC - SYSTEMS 947 QUESTAR TELECOM, INC. 825 OPERATOR SERVICE COMPANY 950 THE ANSWER NETWORK (ANI COMMUNICATIONS) 826 VANGUARD CELLULAR SYSTEMS, INC. 951 INTERACTIVE TELECOM NETWORK, INC. 827 THUNDER BAY CELLULAR MOBILITY 955 MINNESOTA RSA 9 LIMITED PARTNERSHIP 828 UINTAH BASIN TELEPHONE ASSOCIATION 957 RESERVE TELEPHONE COMPANY 829 ADAMS TELECOMMUNICATIONS, INC. 966 WIRELESS ONE NETWORK 830 AT&T 967 TOUCH 1 COMMUNICATIONS 831 AT&T 968 CENTURY TELEPHONE ENTERPRISES, INC. 832 BAY SPRINGS TELEPHONE CO., INC. 969 CLEARNET INC. 833 AT&T 972 WESTERN PCS CORPORATION 834 AT&T 973 USA MOBILE COMMUNICATIONS, INC. II 835 QUEBECTEL MOBILITE 978 J.Q. TURNER & ASSOCIATES, INC. 837 TELEPHONE ASSOCIATES LONG DISTANCE SERVICES, INC. 987 AGT MOBILITY, INC. 838 LAWTON CABLEVISION, INC. 988 WEST TENNESSEE TELEPHONE CO. 840 NATIONWIDE PAGING, INC. 989 ORION TELECOM 841 GULF TELEPHONE COMPANY 842 ORWELL TELEPHONE COMPANY 843 COX ENTERPRISES, INC. 844 HICKORY TELEPHONE COMPANY 845 MARSHALL CELLULAR PARTNERSHIP 846 GTE MOBILE COMMUNICATIONS 847 PUBLIC SERVICE CELLULAR, INC. 848 VAUGHNSVILLE TELEPHONE COMPANY, INC. 850 EASTERN TELECOM 852 FRONTIER LONG DISTANCE OF NEW YORK, INC. 853 VISIONS LONG DISTANCE AMERICA, INC. 855 UNION TELEPHONE COMPANY 862 USA MOBILE COMMUNICATIONS, INC. II 863 TELECOM SERVICES OF TRINIDAD AND TOBAGO 864 AT&T CANADA LONG DISTANCE SERVICES CO. 865 CROCKETT TELEPHONE COMPANY 866 ISLAND TEL 867 NEWFOUNDLAND TELEPHONE 868 NB TEL 869 SASKTEL 870 MARITIME TEL & TEL 871 AGT LIMITED 872 TEL/LOGIC INC. 873 MANITOBA TELEPHONE SYSTEM 874 BELL CANADA 875 U S SIGNAL CORP. 876 OK RSA5 E. PTSHIP. - PIONEER CELL., MANAGING PARTNER 877 SPRINT COMMUNICATIONS CO., L.P. 878 BC TEL. 879 US WEST COMMUNICATIONS, INC. 882 SPRINT / CENTEL OF VIRGINIA 883 TELECOM*USA

47 TABLE 9 LIST OF 500 CODE ASSIGNMENTS SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 467 ACC CORP. 583 AT&T 438 ACCESSLINE TECHNOLOGIES, INC. 584 AT&T 773 ADAMS CELLULAR, INC. 586 AT&T 829 ADAMS TELECOMMUNICATIONS, INC. 518 AT&T 696 ADAMS TELEPHONE CO-OPERATIVE 635 AT&T 564 ADAMS TELSYSTEMS, INC. 516 AT&T 238 ADVANCED RADIO TECHNOLOGIES CORP. 677 AT&T 610 ADVANCED TELECOM SERVICES, INC. 675 AT&T 871 AGT LIMITED 663 AT&T 987 AGT MOBILITY, INC. 664 AT&T 557 AIR CELL, INC. 665 AT&T 898 AIR PAGE CORPORATION 672 AT&T 600 AIRTOUCH COMMUNICATIONS 519 AT&T 700 AIRTOUCH COMMUNICATIONS 481 AT&T 800 AIRTOUCH COMMUNICATIONS 517 AT&T 400 AIRTOUCH COMMUNICATIONS 496 AT&T 478 ALASCOM, INC. 498 AT&T 344 ALL CITY PAGING 488 AT&T 256 ALLNET COMMUNICATION SERVICES, INC. 489 AT&T 262 ALLTEL MOBILE COMMUNICATIONS 490 AT&T 202 ALLTEL SERVICE CORP. 432 AT&T 274 AMERICAN PAGING, INC. 493 AT&T 636 AMERICAN PCS, L.P. dba APC 494 AT&T 272 AMERICAN PCS, L.P. dba APC 485 AT&T 630 AMERICAN PORTABLE TELECOM 497 AT&T 655 AMERICAN SHARECOM, INC. 514 AT&T 261 AMERITECH COMMUNICATIONS INC. (ACI) 501 AT&T 227 AMERITECH MOBILE COMMUNICATIONS, INC. 502 AT&T 746 AMERITECH MOBILE COMMUNICATIONS, INC. 504 AT&T 269 AMERITECH MOBILE COMMUNICATIONS, INC. 509 AT&T 661 AMERITECH MOBILE COMMUNICATIONS, INC. 512 AT&T 758 AMSC SUBSIDIARY CORPORATION 513 AT&T 760 AMSC SUBSIDIARY CORPORATION 346 AT&T 277 ARCH COMMUNICATIONS GROUP, INC. 674 AT&T 279 ARCH COMMUNICATIONS GROUP, INC. 288 AT&T 492 ARMOUR INDEPENDENT TELEPHONE CO. 293 AT&T 383 ATLANTIC CELLULAR CO., L.P. dba ATLANTIC LONG DISTANCE 216 AT&T 447 AT&T 217 AT&T 830 AT&T 218 AT&T 446 AT&T 213 AT&T 834 AT&T 219 AT&T 807 AT&T 215 AT&T 833 AT&T 295 AT&T 367 AT&T 296 AT&T 448 AT&T 673 AT&T 359 AT&T 214 AT&T 831 AT&T 298 AT&T 371 AT&T 210 AT&T 776 AT&T 207 AT&T 390 AT&T 263 AT&T 389 AT&T 208 AT&T 430 AT&T 209 AT&T 431 AT&T 297 AT&T 391 AT&T 212 AT&T 433 AT&T 864 AT&T CANADA LONG DISTANCE SERVICES CO. 785 AT&T 503 AWESOME PAGING, INC. 445 AT&T 653 BARAGA TELEPHONE CO. 437 AT&T 273 BATON ROUGE CELLULAR TELEPHONE CO. 388 AT&T 832 BAY SPRINGS TELEPHONE CO., INC. 442 AT&T 612 BAY STAR COMMS. dba BAY STAR SATELLITE COMMS. 443 AT&T 328 BC TEL MOBILITY CELLULAR, INC. 392 AT&T 878 BC TEL. 491 AT&T 267 BEGGS TELEPHONE COMPANY 449 AT&T 258 BELL ATLANTIC MOBILE 589 AT&T 226 BELL ATLANTIC MOBILE 679 AT&T 224 BELL ATLANTIC NETWORK SERVICES 520 AT&T 369 BELL ATLANTIC NETWORK SERVICES 523 AT&T 874 BELL CANADA 740 AT&T 303 BELL MOBILITY

48 TABLE 9 LIST OF 500 CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 257 BELLSOUTH TELECOMMUNICATIONS, INC. 364 DIGITAL NETWORK, INC. 264 BELLSOUTH WIRELESS, INC. 749 DURANGO CELLULAR TELEPHONE CO. 239 BENTLEYVILLE TELEPHONE COMPANY 525 EASTERN TELECOM 252 BERMUDA TELEPHONE COMPANY, LTD. 850 EASTERN TELECOM 542 BETTLES TELEPHONE COMPANY 250 EASTERN TELECOM 742 BIXBY TELEPHONE COMPANY 347 EASTERN TELELOGIC CORP. 644 BN1 TELECOMMUNICATIONS, INC. 767 ED TEL MOBILITY 292 BRAZORIA TELEPHONE COMPANY 532 EGYPTIAN COMMUNICATION SERVICES, INC. 469 BT TELECOM, INC. 486 EGYPTIAN TELEPHONE COOPERATIVE ASSN. 284 BTI 382 ELKHART TELEPHONE CO. 245 BUDGET CALL LONG DISTANCE, INC. 932 ENID CELLULAR 223 CABLE & WIRELESS, INC. 892 EVANS TELEPHONE CO. 229 CABLE & WIRELESS, INC. 766 FCCA, L.L.C. 294 CABLE & WIRELESS, INC. 787 FIRSTPAGE USA 393 CABLEVISION SYSTEM CORPORATION 474 FISHERS ISLAND TELEPHONE 540 CALL ONE, INC. 462 FLAT ROCK TELEPHONE COOPERATIVE, INC. 499 CAL-ONE CELLULAR, L.P. 332 FREEMAN ENGINEERING ASSOCIATES, INC. 536 CAMERON COMMUNICATIONS CORPORATION 778 FROMM SERVICES, INC. dba THE AN-SER SYSTEM 792 CAMPTI - PLEASANT HILL TELEPHONE CO., INC. 353 FRONTIER COMMUNICATIONS INTERNATIONAL, INC. 736 CANADIAN VALLEY TELEPHONE COMPANY 466 FRONTIER COMMUNICATIONS OF MID ATLANTIC, INC. 730 CELLULAR 7 PARTNERSHIP 515 FRONTIER LONG DISTANCE OF AMERICA, INC. 741 CELLULAR HOLDING, INC. 852 FRONTIER LONG DISTANCE OF NEW YORK, INC. 240 CENTENNIAL CELLULAR CORPORATION 424 GCI CORPORATION 377 CENTRAL OKLAHOMA TELEPHONE COMPANY 907 GCI CORPORATION 283 CENTURY TELEPHONE ENTERPRISES, INC. 747 GENESEO TELEPHONE COMPANY 968 CENTURY TELEPHONE ENTERPRISES, INC. 436 GEOTEK COMMUNICATIONS, INC. 650 CHAMPAIGN TELEPHONE CO. 425 GLACIAL LAKE CELLULAR LIMITED PARTNERSHIP 434 CHEROKEE TELEPHONE CO. 385 GRAND TELEPHONE COMPANY, INC. 304 CHESTER TELEPHONE COMPANY 479 GRANITE STATE TELEPHONE, INC. 667 CHILLICOTHE TELEPHONE COMPANY 545 GST CALL AMERICA 928 CHOCTAW TELEPHONE COMPANY 480 GTE MOBILE COMMUNICATIONS 476 CIMMARON TELEPHONE CO. 846 GTE MOBILE COMMUNICATIONS 743 CIM-TEL CABLE, INC. 483 GTE TELEPHONE OPERATIONS 228 CINCINNATI BELL TELEPHONE 841 GULF TELEPHONE COMPANY 645 CITIZENS TELEPHONE COMPANY (GA) 629 HAMILTON TELEPHONE COMPANY 656 CITIZENS TELEPHONE CO. OF KECKSBURG 768 HARMONY CABLE, INC. 969 CLEARNET INC. 765 HARMONY TELEPHONE COMPANY 627 CLEARTEL COMMUNICATIONS 414 HEBENSTREIT COMMUNICATIONS CORP. 625 CMT PARTNERS 370 HIAWATHALAND CELLULAR LIMITED PARTNERSHIP 329 CMT PARTNERS 844 HICKORY TELEPHONE COMPANY 278 CN COMMUNICATIONS 354 HINTON TELEPHONE COMPANY 652 COBBOSSEECONTEE TELEPHONE & TELEGRAPH 654 HOOPER TELEPHONE COMPANY 233 COLONIAL COMMUNICATION SYSTEMS, INC. 535 HORRY TELEPHONE COOPERATIVE 659 COLUMBUS GROVE TELEPHONE COMPANY 587 HUTCHINSON TELEPHONE COMPANY 281 COLUMBUS TELEPHONE COMPANY, INC. 554 IAN, INC. 348 COM NET, INC. 376 INFONET LONG DISTANCE, L.L.C. 777 COMCAST CELLULAR COMMUNICATIONS, INC. 464 INTELLICOM 753 COMCAST CELLULAR COMMUNICATIONS, INC. 951 INTERACTIVE TELECOM NETWORK, INC. 692 COMMUNICATION OPTIONS, INC. (FLORIDA) 468 INTERELECTRONICS CORPORATION 537 COMMUNICATION TELESYSTEMS INTERNATIONAL (CTS) 201 INTERNATIONAL PRIVATE ACCESS 404 COMMUNICATIONS INNOVATIONS CORP. 582 INTERNATIONAL SATELLITE INTEGRATION SVCS., INC. 482 COMMUNITY SERVICE TELEPHONE 739 INTERNATIONAL TELESERVICES LTD 548 COMPUCELL, INC. 866 ISLAND TEL 728 COMSAT CORP. 734 ISLAND TEL MOBILITY 500 COMTECH INC. 386 JEFFERSON TELEPHONE COMPANY 253 CONCORD TELEPHONE COMPANY 642 JEFFERSON TELEPHONE CO. 268 CONQUEST COMMUNICATIONS CORP. 352 JEROME FREUND 943 CONSOLIDATED TELCO INC. 558 JSM TELE-PAGE, INC. 206 COOK TELECOM, INC. 978 J.Q. TURNER & ASSOCIATES, INC. 415 CORPORATE TECHNOLOGY PARTNERS (CTP) 748 KALEVA TELEPHONE COMPANY 843 COX ENTERPRISES, INC. 439 KALIDA TELEPHONE COMPANY, INC. 865 CROCKETT TELEPHONE COMPANY 693 LAFOURCHE TELEPHONE COMPANY, INC. 744 CROSS CABLE TELEVISION 290 LAHARPE TELEPHONE COMPANY, INC. 463 CROSS TELEPHONE COMPANY 291 LAKEDALE TELEPHONE COMPANY 316 CRUISEPHONE, INC. 577 LANSER PERSONAL COMMUNICATIONS 380 DAKOTA CELLULAR, INC. 838 LAWTON CABLEVISION, INC. 641 DEADWOOD CELLULAR 524 LCI INTERNATIONAL, INC. 300 DELTACOM, INC. 945 LDDS WORLDCOM 220 DIAL CALL, INC. 287 LDDS WORLDCOM

49 TABLE 9 LIST OF 500 CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 581 LDDS WORLDCOM 285 OREGON FARMERS MUTUAL TELEPHONE CO. 276 LDDS WORLDCOM 989 ORION TELECOM 732 LDDS WORLDCOM 842 ORWELL TELEPHONE COMPANY 473 LENNON TELEPHONE COMPANY 372 OT&T COMMUNICATIONS, INC. 547 LIBERTY CELLULAR, INC. 373 PACIFIC BELL MOBILE SERVICES 588 LINCOLN TELEPHONE AND TELEGRAPH 289 PACIFIC BELL MOBILE SERVICES 345 LOS ANGELES CELLULAR TELEPHONE COMPANY 342 PACIFIC BELL MOBILE SERVICES 528 LUFKIN-CONROE TELEPHONE EXCHANGE 585 PACIFIC TELECOM CELLULAR, INC. 622 MAINSTREET COMMUNICATIONS 808 PAC-WEST TELECOMM, INC. dba AMERICALL 873 MANITOBA TELEPHONE SYSTEM 275 PAGEMART, INC. 324 MANKATO CITIZENS TELEPHONE CO. 543 PAGEMART, INC. 870 MARITIME TEL & TEL 738 PAGENET 845 MARSHALL CELLULAR PARTNERSHIP 737 PAGENET 452 MCCLURE TELEPHONE COMPANY 338 PAGEX COMPANY 265 MCI 357 PAGING SYSTEMS, INC. 551 MCI 368 PAGING SYSTEMS, INC. 550 MCI 251 PARALLAX, INC. 533 MCI 626 PARKWAY COMMUNICATIONS, INC. 553 MCI 230 PCC MANAGEMENT 552 MCI 231 PCC MANAGEMENT 772 MESSAGE CENTER USA 477 PCS PRIMECO 888 METROCALL, INC. 325 PENNSYLVANIA TELEPHONE CO. 321 MICROCELL 1-2-1 567 PEOPLES TELEPHONE COMPANY 221 MICROCELL 1-2-1 690 PILGRIM TELEPHONE COMPANY 495 MID-COM COMMUNICATIONS, INC. 909 PILGRIM TELEPHONE COMPANY 260 MINNESOTA RSA 10 LIMITED PARTNERSHIP 813 PINE BELT TELEPHONE CO., INC. dba PBC L.D. 955 MINNESOTA RSA 9 LIMITED PARTNERSHIP 374 PIONEER LONG DISTANCE, INC. 668 MOBILECOM ONE, LLC 375 PIONEER TELEPHONE COOP., INC. (OKLAHOMA) 691 MOBILETEL, INC. 725 PITTENCRIEFF COMMUNICATIONS, INC. 302 MORRIS COMMUNICATIONS, INC. 724 PITTENCRIEFF COMMUNICATIONS, INC. 687 MTS MOBILITY 752 POINT TELESYSTEMS, INC. 688 MT&T MOBILITY 526 POKA LAMBRO COMMUNICATIONS 632 NATIONAL DISPATCH CENTER 756 POKA LAMBRO COMMUNICATIONS 657 NATIONAL TELECOMMUNICATIONS OF FLORIDA, INC. 562 POTTAWATOMIE TELEPHONE CO. 682 NATIONAL TELEPHONE OF ALABAMA, INC. 764 PREFERRED NETWORKS, INC. 840 NATIONWIDE PAGING, INC. 684 PTI COMMUNICATIONS, INC. 666 NATIONWIDE WIRELESS NETWORK 847 PUBLIC SERVICE CELLULAR, INC. 868 NB TEL 779 PUERTO RICO TELEPHONE COMPANY 628 NB TEL MOBILITY 266 QUALICOM, INC. 638 NEW CELL, INC. 835 QUEBECTEL MOBILITE 867 NEWFOUNDLAND TELEPHONE 947 QUESTAR TELECOM, INC. 735 NEWTEL MOBILITY 723 RADIOFONE, INC. 232 NEXTEL COMMUNICATIONS, INC. 784 RAM TECHNOLOGIES 639 NEXTEL COMMUNICATIONS, INC. 733 RED ROSE COMMUNICATIONS, INC. 676 NORCOM NETWORKS CORPORATION 646 REDWOOD COUNTY TELEPHONE COMPANY 538 NORTH COUNTRY TELEPHONE COMPANY 762 RESERVE COMMUNICATIONS & COMPUTER CORP. 429 NORTH COUNTY COMMUNICATIONS CORP. 957 RESERVE TELEPHONE COMPANY 441 NORTHEAST CELLULAR TELEPHONE COMPANY 350 RESPONSE TELEMEDIA 236 NORTHEAST TELEPHONE COMPANY 428 RINGGOLD TELEPHONE COMPANY 243 NPB TELECOM 782 ROANOKE TELCO 699 NYNEX 242 ROCK HILL TELEPHONE COMPANY 299 NYNEX MOBILE COMMUNICATIONS CO. 662 ROGERS CANTEL MOBILE INC. 678 NYNEX MOBILE COMMUNICATIONS CO. 566 ROSEVILLE TELEPHONE COMPANY 769 OHIO STATE CELLULAR PHONE COMPANY, INC. 435 RURAL CELLULAR CORPORATION 876 OK RSA5 E. PARTNERSHIP-PIONEER CELL., MANAG. PART. 869 SASKTEL 534 OK CELL., MANAG. PARTNER FOR OK RSA 6 PARTNERSHIP 306 SASKTEL MOBILITY 927 OKLAHOMA RSA 2-PIONEER CELLULAR, MANAG. PARTNER 315 SCHERERS COMMUNICATIONS GROUP, INC. 563 OKLAHOMA WESTERN TELEPHONE COMPANY 323 SCHNEIDER COMMUNICATIONS, INC. 936 OLD SPA SHOP ANTIQUES 775 SEVEN SEAS COMMUNICATIONS, INC. 326 OMAHA CELLULAR LIMITED PARTNERSHIP 745 SHENANDOAH TELEPHONE COMPANY 349 OMEGA CELLULAR PARTNERS, L.C. 527 SHERBURNE LONG DISTANCE 305 OMNI III CABLE T.V., INC. 472 SHOREHAM TELEPHONE COMPANY, INC. 726 OMNIPOINT CORPORATION 763 SNET CO. 624 OMNIPOINT CORPORATION 569 SNET MOBILECOM, INC 444 ONCOR COMMUNICATIONS, INC. 774 SNET PAGING, INC. 510 ONECOMM COMMUNICATIONS CORPORATION 658 SOUTH HOLT CABLEVISION, INC. 822 ONEONTA TELEPHONE CO. 720 SOUTHWESTERN BELL MOBILE SYSTEMS 237 OPERATOR SERVICE COMPANY 722 SOUTHWESTERN BELL MOBILE SYSTEMS 825 OPERATOR SERVICE COMPANY 721 SOUTHWESTERN BELL MOBILE SYSTEMS

50 TABLE 9 LIST OF 500 CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 508 SOUTHWESTERN BELL TELEPHONE CO. 879 US WEST COMMUNICATIONS, INC. 507 SOUTHWESTERN BELL TELEPHONE CO. 973 USA MOBILE COMMUNICATIONS, INC. II 506 SOUTHWESTERN BELL TELEPHONE CO. 862 USA MOBILE COMMUNICATIONS, INC. II 505 SOUTHWESTERN BELL TELEPHONE CO. 450 USLINK, INC. 453 SPECTRANET, INC. 544 UTILITIES, INC. 757 SPRINGWICH CELLULAR LIMITED PARTNERSHIP 365 U.S. ADVANTAGE LONG DISTANCE, INC. 614 SPRINT CELLULAR COMPANY 487 U.S. INTELCO NETWORKS, INC. 877 SPRINT COMMUNICATIONS CO., L.P. 937 U.S. INTELCO NETWORKS, INC. 249 SPRINT / CAROLINA TELEPHONE 282 U.S. WEST NEWVECTOR GROUP, INC. 946 SPRINT / CENTEL OF NORTH CAROLINA 343 VALU-LINE OF KANSAS, INC. 882 SPRINT / CENTEL OF VIRGINIA 241 VANGUARD CELLULAR SYSTEMS, INC. 286 SPRINT / CENTRAL TELEPHONE - NEVADA 826 VANGUARD CELLULAR SYSTEMS, INC. 886 SPRINT / UNITED TELEPHONE COMPANY OF OHIO 818 VARTEC TELECOM 885 SPRINT / UNITED TELEPHONE CO. OF KANSAS 848 VAUGHNSVILLE TELEPHONE COMPANY, INC. 788 SPRINT / UNITED TELEPHONE CO. OF TEXAS 255 VBI, INC. 786 SPRINT / UNITED TELEPHONE OF FLORIDA 337 VENTURES IN PAGING 884 SPRINT / UNITED TELEPHONE OF INDIANA 770 VIRGIN ISLANDS TELEPHONE CORPORATION 280 SPRINT / UNITED TELEPHONE OF MINNESOTA 853 VISIONS LONG DISTANCE AMERICA, INC. 320 SPRINT / UNITED TELEPHONE OF MISSOURI 387 VI-TEL, INC. 340 SPRINT / UNITED TELEPHONE OF NEBRASKA 427 WABASH TELEPHONE COOPERATIVE, INC. 651 SPRINT / UNITED TELEPHONE OF NEW JERSEY 789 WEST IOWA TELEPHONE COMPANY 729 SPRINT / UNITED TELEPHONE OF PENNSYLVANIA 378 WEST LIBERTY TELEPHONE COMPANY 254 SPRINT / UNITED TELEPHONE OF TENNESSEE 988 WEST TENNESSEE TELEPHONE CO. 259 SPRINT / UNITED TEL. OF SOUTH CAROLINA 972 WESTERN PCS CORPORATION 522 STANDISH TELEPHONE CO. 222 WHIDBEY TELEPHONE CO. 327 STARTEC, INC. 556 WILKES TELEPHONE & ELECTRIC COMPANY 783 STEELVILLE TELEPHONE EXCHANGE, INC. 925 WINCEL CELLULAR CORPORATION 771 STRATEGIC PRODUCTS CORPORATION 539 WINN TELEPHONE COMPANY 234 SWAYZEE TELEPHONE BROADBAND, INC. 246 WINSTAR 362 SWAYZEE TELEPHONE COMPANY, INC. 426 WIRELESS ONE NETWORK 824 TC - SYSTEMS 966 WIRELESS ONE NETWORK 637 TC - SYSTEMS 454 WIRELESS ONE NETWORK 356 TDS TELECOM 200 WKP, INC. 384 TELECALL LONG DISTANCE, INC. 938 WKP, INC. 863 TELECOM SERVICES OF TRINIDAD AND TOBAGO 623 WMW CABLE TV COMPANY 546 TELECOMMUNICATIONS PREMIUM SERVICES 521 WOOD COUNTY TELEPHONE COMPANY 484 TELECOM*USA (MCI) 926 ZENEX LONG DISTANCE 889 TELECOM*USA (MCI) 883 TELECOM*USA (MCI) 887 TELECOM*USA (MCI) 455 TELECONCEPTS, INC. dba TELEPHONE EXPRESS 837 TELEPHONE ASSOCIATES LONG DISTANCE SERVICES, INC. 244 TELEPHONE ELECTRONICS 900 TELEZONE CORPORATION 872 TEL/LOGIC INC. 950 THE ANSWER NETWORK (ANI COMMUNICATIONS) 568 THE FORT JENNINGS TELEPHONE COMPANY 334 THE PINE TREE TELEPHONE & TELEGRAPH CO. 465 THE SYCAMORE TELEPHONE COMPANY 827 THUNDER BAY CELLULAR MOBILITY 225 TIME WARNER TELECOMMUNICATIONS 761 TMI COMMUNICATIONS 967 TOUCH 1 COMMUNICATIONS 423 TRI COUNTY TELEPHONE COMPANY, INC. 235 TRIAD MINNESOTA CELLULAR L. P. 405 TRIAD OKLAHOMA CELLULAR L.P. 806 TRIAD TEXAS CELLULAR L.P. 801 TRIAD UTAH CELLULAR L.P. 620 TRILLIUM CELLULAR CORP. 823 TRI-TOUCH AMERICA 754 TWO WAY RADIO OF CAROLINA, INC. 875 U S SIGNAL CORP. 828 UINTAH BASIN TELEPHONE ASSOCIATION 456 UNICOM CORPORATION (SOUTH CAROLINA) 855 UNION TELEPHONE COMPANY 647 UNION TELEPHONE COMPANY (SD) 755 UNITED STATES CELLULAR CORPORATION 247 UNITED STATES CELLULAR CORPORATION 529 UNITED STATES CELLULAR CORPORATION

51 TABLE 10 555 LINE NUMBER BALANCE SHEET (AS OF MARCH 31, 1997)

LINE ASSIGNED AS NUMBERS

REGIONAL NUMBERS 372 NATIONAL NUMBERS 2,163 DIRECTORY ASSISTANCE (1212) 1

RESERVED (0100-0199) 100 UNASSIGNED NUMBERS 7,364

TOTAL 10,000

TABLE 11 NUMBER OF 555 LINE NUMBERS ASSIGNED

ASSIGNED ASSIGNED YEAR DURING AT END QUARTER OF QUARTER

1994 2ND QUARTER 6 6 3RD QUARTER 545 551 4TH QUARTER 459 1,010

1995 1ST QUARTER 361 1,364 2ND QUARTER 220 1,577 3RD QUARTER 119 1,700 4TH QUARTER 49 1,724

1996 1ST QUARTER 207 1,916 2ND QUARTER 267 2,175 3RD QUARTER 5 2,180 4TH QUARTER 245 2,425

1997 1ST QUARTER 110 2,535

52 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 0000 N MID ATLANTIC TELECOM 1000 R HUNTSVILLE TIMES 0001 N PAYLINE SYSTEMS, INC. 1000 R OREGONIAN PUBLISHING CO. 0002 R BALTIMORE SUN COMPANY 1000 R TORONTO STAR 0003 R BALTIMORE SUN COMPANY 1000 R NYNEX/NEW ENGLAND 0004 R BALTIMORE SUN COMPANY 1000 R PATRIOT-NEWS CO. 0005 R ADVANCED PURE WATER CORP. 1000 R KALAMAZOO GAZETTE 0005 R BALTIMORE SUN COMPANY 1000 R AIR ONE, INC. 0007 N HOOT N HOLLER PUBLICATIONS, INC. 1001 N PAYLINE SYSTEMS, INC. 0010 N US NETWORK SERVICES 1003 N CARLTON TELEPHONICS CORP. 0011 N SYRACUSE NEWSPAPER 1010 R POST-NEWSWEEK STAT. - FLORIDA, INC. 0012 N US NETWORK SERVICES 1010 R TORONTO STAR 0013 N US NETWORK SERVICES 1010 R METROPOLITAN POLICE DEPARTMENT 0014 N US NETWORK SERVICES 1040 N MATT OLSON 0022 N MIRAGE MARKETING 1041 R WSB, INC. 0033 N MIRAGE MARKETING 1050 N PACIFIC RIM ADVERTISING 0036 N E OFFICE CORPORATION 1051 R WIOD, INC. 0044 N MIRAGE MARKETING 1059 R WCKG, INC. 0066 N MIRAGE MARKETING 1073 R WWRM, INC. 0077 N MIRAGE MARKETING 1079 R WCKG, INC. 0200 N DARREN CHAFFEE 1121 N CROW INT'L. 0202 N PCM, INC. 1122 N RCI LONG DISTANCE NEW ENGLAND 0211 N RCI LONG DISTANCE NEW ENGLAND 1133 N PHONE PROGRAMS, INC. 0222 N INPHONEMATION, INC. 1155 N PACIFIC RIM ADVERTISING 0261 R POST-NEWSWEEK CABLE 1166 N PACIFIC RIM ADVERTISING 0270 N RICHARD A. STONE 1177 N WARREN JASON 0300 N BLUE AMBER MOTEL, INC. 1198 N AGT LIMITED 0303 N REBECCA SHAPIRO 1199 N LDC ENTERPRISES 0328 N ENHANCED TELEPHONE SERVICES, INC. 1200 R UNION NEWS & SUNDAY REPUBLICAN 0333 N INPHONEMATION, INC. 1200 R PATRIOT-NEWS CO. 0400 N JONATHAN FINESTONE 1211 N WHYT-FM 0404 N REBECCA SHAPIRO 1213 R HERALD-WA. 0411 N 555-FAX-IT 1213 R AIR ONE, INC. 0421 N ADAM/CHARLES TEXTILES 1215 N AIR ONE, INC. 0444 N CRAIG 'TAX FREEZE' FREIS 1221 N INTEGRATED DATA CONCEPTS 0445 N CRAIG 'TAX FREEZE' FREIS 1222 N D. J. ENTERPRISES 0446 N CRAIG 'TAX FREEZE' FREIS 1225 N AMERITECH COMMUNICATIONS 0447 N CRAIG 'TAX FREEZE' FREIS 1227 N MOBIUS RESEARCH 0448 N CRAIG 'TAX FREEZE' FREIS 1228 R BURLINGTON COUNTY TIMES 0500 R CONCORD TELEPHONE COMPANY 1234 R SOUTHAM INC. 0500 R ADVANCED PURE WATER CORP. 1234 R US WEST 0505 N TELETEL 1234 R PATRIOT-NEWS CO. 0511 N 555 ON-LINE 1234 R BURLINGTON COUNTY TIMES 0516 N LDC ENTERPRISES 1234 R UNION NEWS & SUNDAY REPUBLICAN 0525 R LEXINGTON TELEPHONE CO. 1234 R CONDE' NAST/BON APPETIT 0526 R LEXINGTON TELEPHONE CO. 1234 R BUCKS COUNTY COURIER TIMES 0527 R LEXINGTON TELEPHONE CO. 1234 R TRI-CITY HERALD 0528 R LEXINGTON TELEPHONE CO. 1234 R AMERITECH 0529 R LEXINGTON TELEPHONE CO. 1234 R ADVANCED PURE WATER CORP. 0555 N TELECENTER INC. 1234 R FRESNO BEE 0562 N ENHANCED TELEPHONE SERVICES, INC. 1234 R SOUTHWESTERN BELL-ST. LOUIS 0565 N JAMES F. BISHER, JR. 1238 N HUTCH CO. 0600 R CONCORD TELEPHONE COMPANY 1242 N AIR ONE, INC. 0664 N LIONESS ASSOCIATES 1265 N KLM & R COMMUNICATIONS 0700 N DARREN CHAFFEE 1266 N THIRD STREET CHATTER 0722 N ROBERT A. BLAISCH 1269 N BICOM 0777 N PAGEMART, INC. 1288 N AT&T 0808 N ENHANCED TELEPHONE SERVICES, INC. 1290 R WHIO, INC. 0811 R COUNTY PRESS 1300 R UNION NEWS & SUNDAY REPUBLICAN 0811 R JOSEPH BASIL MILLER 1311 R MARKETLINK INC 0872 N AMERITECH COMMUNICATIONS 1313 R GCI CORP. 0888 N PAGEMART, INC. 1313 R AGT LIMITED 0900 N BLUE AMBER MOTEL, INC. 1313 R MT&T 0909 N ENHANCED TELEPHONE SERVICES, INC. 1313 R BC TEL 0911 R C.H. EPPERT 1313 R BELL CANADA 0924 N PAUL LOCKWOOD 1313 R SASKTEL 0957 N WJR -DIV. OF CAPITAL CITIES/ABC, INC. 1313 R NEWFOUNDLAND TEL 0980 N DIANE BAKER-LOCKWOOD 1313 R NB TEL 0988 N JEFF SPANG 1313 R MTS 0999 N PAGEMART, INC. 1328 N TAKEOUT TAXI HOLDINGS, INC.

TYPE N - NATIONAL, R - REGIONAL 53 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 1333 N PTI COMMUNICATIONS 1990 N STARMAGIC MEDIA SERVICES 1357 N TAKEOUT TAXI HOLDINGS, INC. 1995 N REVENUE CANADA 1359 N CAROL SHAPIRO 1996 R RAFFERTY, INC. 1369 N HUTCH CO. 1996 R VOICE INFO, SVCS., INC. 1379 N RCI LONG DISTANCE, INC. 1998 R DAVID I. ADELMAN 1400 R HERITAGE INFORMATION SERVICES 1999 N ONCOR COMMUNICATIONS, INC. 1414 N HALICO, INC. 2001 N ONCOR COMMUNICATIONS, INC. 1426 N MOBIUS RESEARCH 2003 N WORD OF MOUTH ADVERTISING 1463 N EXCELL AGENT SERVICES 2010 N ADAM/CHARLES TEXTILES 1478 N BUDGET CALL LONG DISTANCE 2020 N SYNCRONET, INC. 1500 R ANCHORAGE DAILY NEWS 2026 N E OFFICE CORPORATION 1500 R HUNTSVILLE TIMES 2030 N TELEMATION INTERNATIONAL 1501 R ST. FRANCIS REGIONAL MEDICAL CENTER 2039 N JAMES E. BOGAR 1502 R ST. FRANCIS REGIONAL MEDICAL CENTER 2053 N WORD OF MOUTH ADVERTISING 1503 R ST. FRANCIS REGIONAL MEDICAL CENTER 2055 N STANLEY SHAPIRO 1504 R ST. FRANCIS REGIONAL MEDICAL CENTER 2097 N FIBERLINK, INC. 1505 R ST. FRANCIS REGIONAL MEDICAL CENTER 2100 N TELETEL 1515 R BELL ATLANTIC-NJ (GRANDFATHERED) 2111 N SYRACUSE NEWSPAPER 1515 R AT&T 2201 N BETTY JOE, INC. 1515 R NYNEX/NEW ENGLAND 2202 N BETTY JOE, INC. 1525 N KLM & R COMMUNICATIONS 2203 N BETTY JOE, INC. 1529 N WILL KAHANE 2204 N BETTY JOE, INC. 1555 N SYRACUSE NEWSPAPER 2205 N BETTY JOE, INC. 1600 R TEK COMMUNICATIONS, INC. 2211 N DDI CORPORATION 1611 R NYNEX/NEW ENGLAND 2220 N INPHONEMATION, INC. 1616 N BENNETT PUBLICATIONS 2221 N ABC RADIO NETWORKS, INC. 1622 N THIRD STREET CHATTER 2224 N 800 CONCEPTS LLC 1624 N NEED COMMUNICATIONS, INC. 2225 N POST-NEWSWEEK CABLE 1638 N LIONESS ASSOCIATES 2226 N T.C.R. COMMUNICATIONS L.L.C. 1661 N BT SERVICES, INC. 2228 R JOSEPH BASIL MILLER 1688 N THIRD STREET CHATTER 2228 R BUCKS COUNTY COURIER TIMES 1700 R TEK COMMUNICATIONS, INC. 2229 N TELEDONTICS, INC. 1717 R NYNEX/NEW ENGLAND 2232 N ALL AMERICAN TELEPHONE CO. 1727 N NEXUS COMMUNICATIONS, INC. 2233 N FLAMELESS HEAT, INC. 1729 N E OFFICE CORPORATION 2237 N SPARKS COMMUNICATIONS 1761 N JEFF SPANG 2242 N WM. HARDASH COMMUNICATIONS 1762 N NEXUS COMMUNICATIONS, INC. 2243 N AUCTION VISION INT'L US, INC. 1776 N INT'L DEVELOPMENT & ENTERPRISE 2244 N ECCO, INC. 1786 N MIDDLE AMERICA TALK NETWORK 2245 N T & J INFORMATION 1787 N MIDDLE AMERICA TALK NETWORK 2247 N COMPUSERVE INCORPORATED 1800 R TEK COMMUNICATIONS, INC. 2253 N MARK TELECOM, LTD. 1811 R NYNEX/NEW ENGLAND 2254 N D.K. COMMUNICATIONS L.L.C. 1818 N INFONXX 2256 N BTNA/TYMNET 1825 N EDNA L. MCKINLEY 2257 N DREAM THEME, INC. 1834 N TZS CORP. 2258 N RITA DUSSEAU 1842 N WILL KAHANE 2262 N US WEST MARKETING RESOURCES 1845 R SPARTA NEWS PLAINDEALER 2263 R TIME WARNER COMMUNICATIONS 1846 N INVESTMENT ENGINEERS 2264 N BT TELESIS, INC. 1847 N INVESTMENT ENGINEERS 2266 N MOBIUS RESEARCH 1848 N INVESTMENT ENGINEERS 2267 N TETHRA CORP. 1849 N INVESTMENT ENGINEERS 2269 N COX ENTERPRISES 1850 N INVESTMENT ENGINEERS 2272 N BTNA/TYMNET 1860 R METRO TELECOMM SERVICES 2275 N ALL AMERICAN TELEPHONE CO. 1860 R UNION NEWS & SUNDAY REPUBLICAN 2276 N TZS CORP. 1866 N NEWSPAPER NETWORK 2278 N ASSOC. VENTURE SVCS., INC. 1867 N REVENUE CANADA 2279 N BEDFORDSHIRE COMMUNICATIONS 1868 N TAKEOUT TAXI HOLDINGS, INC. 2282 N 555 INFO NET 1872 N AMERITECH COMMUNICATIONS 2283 N JOLT COMMUNICATIONS, INC. 1879 N STEPHEN SMITH 2284 N B & A ENTERPRISES 1891 R HERALD-WA. 2286 N SPARKS COMMUNICATIONS 1892 N THIRD STREET CHATTER 2287 N ELIZABETH DOWLING 1900 R TEK COMMUNICATIONS, INC. 2288 N POST-NEWSWEEK CABLE 1919 N AT&T 2292 N SANDRA SPANG 1929 N BOO ENTERPRISES 2293 N BROOKS TELE-COM SERVICES 1941 N JAMES F. BISHER, JR. 2295 N ALTIMONT COMMUNICATIONS 1949 N SUMMIT COMMUNICATIONS 2296 N CCB TELEPHONY, INC. 1963 R WHYT-FM 2297 N FALSTAFF TELE-COM 1967 N REVENUE CANADA 2300 N SCHERERS COMMUNICATIONS 1980 N STARMAGIC MEDIA SERVICES 2311 N MIDDLE AMERICA TALK NETWORK 1989 N RICHARD A. STONE 2322 N AYSM CORP.

TYPE N - NATIONAL, R - REGIONAL 54 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 2323 N LOCAL EXCHANGE CO. 2472 N CHARLOTTE DUNCAN 2326 N RITA DUSSEAU 2473 N MARK PAUL BORNSTEIN 2327 R RICHARD S. BELL 2474 N MICHAEL B. MAW 2328 N MADEMOISELLE 2475 N LANSDALE COMMUNICATIONS 2329 R GAZETTE NEWSPAPERS 2477 R CANADIAN COAST GUARD 2333 N NORTHWEST FARMER-STOCKMAN, INC. 2478 N WAYLAND COMMUNICATIONS 2334 N HOWARD JONAS 2479 N SEAWYF, INC. 2343 N ENCORE AGENCY 2482 N TZS CORP. 2345 N EXCELL AGENT SERVICES 2483 N CATHY S. SURACE 2346 N CHRISTOPHER P. OBERLE 2484 N CITIZENS UTILITIES 2348 N GARY W. ANDERSON 2487 N SPRINT COMMUNICATIONS 2349 N LINDA D. ANDERSON 2488 N UNASOURCE MARKETING GROUP 2358 N O'BRIEN COMMUNICATION SERVICES 2489 N FLIGHT RESOURCES, INC. 2359 N AIRLINE VENTURE SVCS., INC. 2492 N DIANE BAKER-LOCKWOOD 2362 N NAT REESE 2500 R COWLES MEDIA COMPANY 2363 N ESTHER SIEGEL 2500 R TIMES-PICAYUNE PUBLISHING CORP. 2364 N PLANDOME COMMUNICATIONS 2500 R OREGONIAN PUBLISHING CO. 2366 N WIRELESS ONE NETWORK 2522 N OCEAN ATLANTIC COMMUNICATIONS 2367 N MARKET DEVELOPMENT CORP. 2524 N T.C.R. COMMUNICATIONS L.L.C. 2368 N HIGH INTEREST COMMUNICATIONS 2526 N ABCD, INC. 2372 N JFR NUMBER SYSTEMS 2527 N DAILY HERALD 2374 N RGM COMMSTAR 2529 N UNASOURCE MARKETING GROUP 2375 N RDC TELEMANAGEMENT, INC. 2532 N J & T TELECOM CORP. 2376 N ICS HOLDINGS COMPANY 2537 N IQ, INC. 2377 N PLANDOME COMMUNICATIONS 2538 N AURAND 2378 N AERIE GROUP 2542 N RANDOM ACCESS CORP. 2381 N SANTA FE NEW MEXICAN 2543 N CREATIVE CALL MANAGEMENT 2382 N GAIL MARIE NAFTALIN 2546 N T.C.R. COMMUNICATIONS L.L.C. 2383 N FTD DIRECT ACCESS, INC. 2548 N CREATIVE CALL MANAGEMENT 2384 N FIBERLINK, INC. 2552 N EILEEN LOCKWOOD 2385 N M&C MINNESOTA, INC. 2554 N RANDOM ACCESS CORP. 2386 N CHRISTOPHER P. OBERLE 2555 R CHICAGO TRIBUNE CO. 2387 N PC-TOTES, INC. 2557 N MARKET POWER, INC. 2388 N CARLTON TELEPHONICS CORP. 2558 N ALLURE MAGAZINE 2389 N JESSICA JONAS 2562 N BH INFORMATION CORP. 2392 N SUMMIT COMMUNICATIONS 2564 N RICHARD LEVINE 2394 N CECELIA DOWNS 2566 N FINANCIAL TELESYS CORP. 2399 N BTD ENTERPRISES 2567 N FALSTAFF TELE-COM 2400 N SYNCRONET, INC. 2568 N THELMA NELLES 2411 N MATHEWS AERIAL SERVICES, INC. 2569 N TOUCH PHONE PRODUCTIONS, INC. 2422 N BUDDY HOWE 2574 N BEDFORDSHIRE COMMUNICATIONS 2423 N JOYCE S. MARKHAM 2576 N JEROME SACHS 2424 N LOCAL EXCHANGE CO. 2577 N JEROME SACHS 2425 N MICHAEL B. MAW 2580 N MID ATLANTIC TELECOM 2426 N ADVANTIS 2582 N BT TELECOM, INC. 2427 R CONSUMERS GAS 2586 N DENNIS TEMPLE 2428 N LIFE ZONE SERVICES 2592 N AUDREY COX 2429 N DEENA JORGENSON 2622 N FINANCIAL VENTURES SVCS. 2432 N RWH INFORMATION CORP. 2624 N PAUL SIMONS 2433 N ROBERT A. BLAISCH 2625 R MARISSA JOURNAL 2435 N DEENA JORGENSON 2626 N LOCAL EXCHANGE CO. 2436 N JFC TELECOMM, INC. 2627 N ALTIMONT COMMUNICATIONS 2437 N TELEHEALTH SERVICES, INC. 2628 N STONEBRAKER & WILSON, INC. 2438 N A. JACOB ARTHUR ASSOC. 2632 N SAM HAIM 2442 N VOGUE 2633 N CANADA POST CORPORATION 2443 N G.R.F. COMMUNICATION SERVICES 2636 N A. JACOB ARTHUR ASSOC. 2444 N GEORGE LOCKWOOD 2637 N CHARLOTTE DUNCAN 2445 N ABC DAYTIME CIRCLE, INC. 2643 N KNR ASSOCIATES 2446 N INT'L DEVELOPMENT & ENTERPRISE 2645 N A.S.M. COMMUNICATION SERVICES 2447 N INTERNATIONAL TELEPHONE MAIL 2646 N M&C MINNESOTA, INC. 2448 N BRENDAN CORP. 2648 N BUC-VIN TELESERVICES 2453 N ACTIVITY DIRECTORIES INTL., INC. 2653 N COCA-COLA BEVERAGES LTD. 2455 N INTERACTIVE VIDEO ENTERPRISES 2654 N MARKET SHARE, INC. 2463 N RAPMIL CORPORATION 2655 N COMMUNICATIONS VENTURE SVCS., INC. 2464 N MF INDUSTRIES 2656 N MARK PAUL BORNSTEIN 2466 N LINDA D. ANDERSON 2658 N EFGH, INC. 2467 N RAMBLEWOOD COMMUNICATIONS 2661 N BT SERVICES, INC. 2468 N RCI LONG DISTANCE, INC. 2662 N NOR CORP. 2469 N FALSTAFF TELE-COM 2663 N SAM HAIM 2471 N COMPUSERVE INCORPORATED 2664 N MARKET DEVELOPMENT CORP.

TYPE N - NATIONAL, R - REGIONAL 55 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 2666 N THOMAS J. HUGHES, III 2782 N B.H. COMMUNICATION SERVICE 2667 N TERATECH, INC. 2783 N BOWIE COMMUNICATIONS 2668 N MARY MOEHLE 2784 N SNOMIS CORP. 2672 N M.L.C. COMMUNICATIONS 2785 N SR TELECOM SERVICES 2673 N NANCO INTERNATIONAL 2786 N AUCTION VISION INT'L US, INC. 2674 N CAROLYN HENRICK 2787 N DAILY HERALD 2676 N 900 VOICE, INC. 2789 N SR TELECOM SERVICES 2677 N AYSM CORP. 2796 N JEROME SACHS 2678 N CHRISTOPHER P. OBERLE 2797 N TANGLEWOOD COMMUNICATION SVCS. 2679 N SIDNEY LEVINSOHN 2798 N STANLEY SHAPIRO 2684 N T.C.R. COMMUNICATIONS L.L.C. 2800 N TELEPHONE BROADCASTING SYSTEMS 2685 N BANK OF MONTREAL 2822 N SINNAMON PR0DUCTIONS 2686 N STARMAGIC MEDIA SERVICES 2825 N B & A ENTERPRISES 2687 R LEGAL COMMUNICATION CORP. 2827 R RICHARD S. BELL 2687 R MERCURY NEW MEDIA 2828 N CANADA TRUST CO. 2688 N MARY MOEHLE 2831 N LEVINSOHN GROUP, II, INC. 2689 R SEDGEWICK COUNTY INFO. SERVICES 2833 N ADAM/CHARLES TEXTILES 2691 N DAVID L. SIMONS 2834 N ABCD, INC. 2692 N ZASSODA ENTERPRISES 2835 N WAYLAND COMMUNICATIONS 2693 N BOWIE COMMUNICATIONS 2836 N TELPLEX INTERNATIONAL LLC 2695 N RWH INFORMATION CORP. 2837 N PATTI LOTTERMOSER 2697 N IJKL, INC. 2838 N ALTIMONT COMMUNICATIONS 2699 N COX TECHNOLOGY INVESTMENTS 2839 N WAYLAND COMMUNICATIONS 2700 N INTEGRATED DATA CONCEPTS 2842 N EXECUTIVE TELERESEARCH, INC. 2701 R PLAIN DEALER PUBLISHING CO. 2843 R REMINDER NEWSPAPERS 2702 R PLAIN DEALER PUBLISHING CO. 2844 N STEVEN R. KATZ 2703 R PLAIN DEALER PUBLISHING CO. 2845 N TERRIAN CORP. 2704 R PLAIN DEALER PUBLISHING CO. 2846 N DW FITNESS 2705 R PLAIN DEALER PUBLISHING CO. 2847 N ASSOC. VENTURE SVCS., INC. 2718 N PAUL LOCKWOOD 2849 N RAPMIL CORPORATION 2721 N AMERICAN PCS, L.P. (DBA APC) 2852 N CORCORAN GROUP, INC. 2722 N GAITHER COMMUNICATIONS 2854 N SR TELECOM SERVICES 2723 N CROW INT'L. 2855 R RICHARD S. BELL 2724 N ARCHITECTURAL DIGEST 2862 N MARKET DEVELOPMENT CORP. 2725 N BRENDAN CORP. 2866 N DEBBIE A. COSPER 2726 N NOR CORP. 2867 N BT HOLDINGS, INC. 2727 N INFO ACCESS, INC. 2868 N NETWORK TELEPHONE SERVICES, INC. 2728 N BF&L 2869 N TERRIAN CORP. 2729 N E OFFICE CORPORATION 2872 N CREATIVE CALL MANAGEMENT 2732 N INTERNATIONAL TELESIS, INC. 2873 N HEALTH VENTURE SVCS., INC. 2733 N CREDIT CENTRAL SVCS., INC. 2874 N EXOTIC SERVICES, INC. 2734 N MANHEIM AUTO AUCTIONS, INC. 2875 N MATHEWS AERIAL SERVICES, INC. 2735 N D. J. ENTERPRISES 2876 N SR TELECOM SERVICES 2736 N AUDREY COX 2877 N DEJA LOCKWOOD 2737 N JEROME SACHS 2878 N SINNAMON PR0DUCTIONS 2739 N STEVEN D. MONTGOMERY 2879 N MICHAEL TABOR 2742 N CAROLYN CHAMBERLAIN 2880 N STANLEY SHAPIRO 2743 N BRIDE'S MAGAZINE 2883 N BT HOLDINGS, INC. 2745 N GEORGE LOCKWOOD 2884 N ADVANTIS 2746 N TOP LINE RESOURCES 2887 N 900 VOICE, INC. 2747 N WORLD WIDE NETWORKS 2888 N TOUCH PHONE PRODUCTIONS, INC. 2748 N THOMAS J. HUGHES, III 2892 N OCEAN ATLANTIC COMMUNICATIONS 2752 N EXECUTIVE TELERESEARCH, INC. 2893 N EFGH, INC. 2753 N J.S. TELE-COM SERVICES 2894 N MARKET DEVELOPMENT CORP. 2754 R FONES WEST 2923 N ICS NETWORKS, INC. 2756 N CROFT CONSULTANTS 2925 N RWH INFORMATION CORP. 2757 N LEGAL TELCOM SYSTEMS, INC. 2933 N WEDDINGFONE, INC. 2762 N STEVEN R. KATZ 2937 N GEORGE LOCKWOOD 2765 N BH INFORMATION CORP. 2944 N CABLE & WIRELESS 2766 N JEFF SEAL 2946 N COX COMMUNICATIONS, INC. 2767 N TANGLEWOOD COMMUNICATION SVCS. 2953 N EILEEN LOCKWOOD 2769 N MIKE MOEHLE 2964 N WAYLAND COMMUNICATIONS 2771 N COMPUSERVE INCORPORATED 2967 N TETHRA CORP. 2772 N SPARKS COMMUNICATIONS 2969 N HIGH INTEREST COMMUNICATIONS 2773 N J&S COMMUNICATIONS SVCS. 2972 N CAROLYN HENRICK 2775 N SYLVIA BLAISCH 2983 N NAND CORP. 2776 N 555 ON-LINE 2985 R WSB, INC. 2777 N J.B. TELECOM, INC. 2993 N SNOMIS CORP. 2778 N SPRINT LOCAL TELECOM DIVISION 3020 N WESLEY MEDICAL CENTER 2781 N SANTA FE NEW MEXICAN 3028 N KENSINGTON PHYSICAL THERAPY

TYPE N - NATIONAL, R - REGIONAL 56 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 3030 N TELETEL 3354 N JOLT COMMUNICATIONS, INC. 3050 N WESLEY MEDICAL CENTER 3355 N SAN MARCOS LONG DISTANCE 3073 N HANNAH SHAPIRO 3358 N AIRLINE VENTURE SVCS., INC. 3100 R NEWSWEEKLY 3362 N TETHRA CORP. 3111 N PACIFIC RIM ADVERTISING 3364 N G.R.F. COMMUNICATION SERVICES 3156 N BG ASSOCIATES 3366 N 555-FAX-IT 3163 N BG ASSOCIATES 3367 N MICHAEL B. MAW 3223 N ALLURE MAGAZINE 3368 N SOURCE 3224 N J&S COMMUNICATIONS SVCS. 3374 N GAITHER COMMUNICATIONS 3225 N NETWORK USA 3375 N K.M. COMMUNICATION SERVICES 3226 R MURIETA TIMES 3376 N JA ASSOCIATES 3227 N BG ASSOCIATES 3377 N GAITHER COMMUNICATIONS 3232 N INFO ACCESS, INC. 3378 N NATIONWIDE WIRELESS NETWORK 3233 N GAIL MARIE NAFTALIN 3382 N DETAILS MAGAZINE 3237 N JEROME SACHS 3383 N SNOWMASS COMMUNICATIONS 3239 N JEFF SPANG 3384 N FALSTAFF TELE-COM 3242 N LUBBOCK COMMUNICATIONS SVCS. 3386 N GAITHER COMMUNICATIONS 3244 N LUBBOCK COMMUNICATIONS SVCS. 3393 N GAIL MARIE NAFTALIN 3245 N DREAM THEME, INC. 3398 N DENNIS TEMPLE 3247 N VANITY FAIR 3410 N FIBERLINK, INC. 3248 N NEUROLOGY CLINIC, P.C. 3411 N HEBENSTREIT COMMUNICATIONS 3255 N BTD ENTERPRISES 3422 N JAMES MARLIN 3259 N SUSAN M. STONE 3423 N CORCORAN GROUP, INC. 3262 N JOSEPH WEISS 3424 N HOWARD JONAS 3263 N 800 CONCEPTS LLC 3425 N RCI LONG DISTANCE NEW ENGLAND 3264 N ENCORE AGENCY 3426 N JAMES R. WALZ 3266 N FINANCIAL TELESYS CORP. 3427 N K.M. COMMUNICATION SERVICES 3267 N DREAM THEME, INC. 3428 N ESTHER SIEGEL 3268 N SEATTLE-COM L.L.C. 3432 N JARDINE TELE-COM 3272 N SPRINT COMMUNICATIONS 3433 N EASTON COMPANIES, INC. 3273 N TELEFARE COMMUNICATIONS, INC. 3434 R GTE TELEPHONE OPERATIONS CO. 3274 N GLAMOUR MAGAZINE 3436 N ANDREW PENN 3275 N TUNA CORP. 3437 N MARYLAND TEL-COM SERVICES 3276 N NORTHWEST FARMER-STOCKMAN, INC. 3438 N EASTON COMPANIES, INC. 3284 R NEVADA BELL 3442 N SOUTHWESTERN BELL - TEXAS 3285 N G.R.F. COMMUNICATION SERVICES 3443 N MARYLAND TEL-COM SERVICES 3286 N GAIL MARIE NAFTALIN 3444 N HAMMERLY PRODUCTIONS 3287 N MARK TELECOM, LTD. 3445 N ESTHER SIEGEL 3288 N MATHEWS AERIAL SERVICES, INC. 3447 N PATTI LOTTERMOSER 3291 N 555-FAX-IT 3448 N JOYCE S. MARKHAM 3292 N 555-FAX-IT 3452 N JOSEPH WEISS 3293 N KAREN LOCKWOOD 3453 N STELLA WEISS 3294 N 555-FAX-IT 3455 N LINDA D. ANDERSON 3295 N TANGLEWOOD COMMUNICATION SVCS. 3458 N OCEAN ATLANTIC COMMUNICATIONS 3296 R MERCURY NEW MEDIA 3462 N FCS, INC. 3297 N INTEGRATED DATA CONCEPTS 3464 N ELAINE CALLINAN 3298 N PRO SAFE CORPORATION OF AMERICA 3465 N RITCHFIELD TELCOM SERVICES 3299 R JACKSON CITIZEN PATRIOT 3466 N ASPEN COMMUNICATIONS CORP. 3311 N BILL CHOBY 3467 N CATHY S. SURACE 3312 N BILL CHOBY 3472 N GLOBAL TECHNOLOGY CORP. 3321 N MATT OLSON 3473 N CHARLOTTE DUNCAN 3322 R LANCASTER NEWSPAPERS, INC. 3475 N TERATECH, INC. 3322 R JOSEPH BASIL MILLER 3476 R PACIFIC BELL-NATL. ACCOUNTS 3323 N NAND CORP. 3477 N INT'L DEVELOPMENT & ENTERPRISE 3324 N ECCO, INC. 3478 N DW FITNESS 3325 R SPARTA NEWS PLAINDEALER 3483 N ACTIVITY DIRECTORIES INTL., INC. 3326 N DIVAD TELECOM 3486 N MARKET DEVELOPMENT CORP. 3327 R BRITE VOICE SYSTEMS 3487 N MICHAEL ABRAHAMS 3328 N FTW, INC. 3488 N SELF MAGAZINE 3329 N TERRIE GILPIN 3492 N WAYLAND COMMUNICATIONS 3331 N STATE OF NEVADA 3494 N SUMMERHILL VENTURES, INC. 3334 N PRO SAFE CORPORATION OF AMERICA 3496 N JR NETWORK SERVICES 3335 N JA ASSOCIATES 3497 N SR TELECOM SERVICES 3337 N BT HOLDINGS, INC. 3500 R HERITAGE INFORMATION SERVICES 3338 N NANCY M. JONAS 3500 R TIMES-PICAYUNE PUBLISHING CORP. 3339 N SAN MARCOS LONG DISTANCE 3509 N FTD DIRECT ACCESS, INC. 3343 N VOGUE 3522 N CATHY S. SURACE 3347 N CHRISTINE MARLIN 3524 N TIMES LEADER 3348 N GQ MAGAZINE 3525 N PAUL SIUDZINSKI 3352 N D.K. COMMUNICATIONS L.L.C. 3527 N WEDDINGFONE, INC.

TYPE N - NATIONAL, R - REGIONAL 57 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 3528 N J.S. TELE-COM SERVICES 3684 N JFR NUMBER SYSTEMS 3532 N ABC ENTERPRISES 3686 N ABC ENTERPRISES 3533 N T.C.R. COMMUNICATIONS L.L.C. 3687 N ZOOM VIDEO PRODUCTIONS 3535 N GANNETT CO., INC. 3692 R KTVU, INC. 3536 N JAMES MARLIN 3695 N DAVID H. LOCKWOOD 3538 N GAIL MARIE NAFTALIN 3696 N JESSICA JONAS 3539 N JAMIESON CORPORATION 3698 N BUDGET CALL LONG DISTANCE 3541 N ELECTRIC LIGHTWAVE, INC. 3699 N INTERNATIONAL PRIVATE ACCESS 3542 N ELECTRIC LIGHTWAVE, INC. 3711 N CHRISTOPHER P. OBERLE 3543 N ELECTRIC LIGHTWAVE, INC. 3722 N CAC TELECOMM, INC. 3544 N ELECTRIC LIGHTWAVE, INC. 3723 N ASC 3545 N ELECTRIC LIGHTWAVE, INC. 3724 N DAVID H. LOCKWOOD 3547 N ESTHER SIEGEL 3726 N NATL. TELEPHONE ENTERPRISES 3548 N BURKE TELCOM SERVICES 3727 N PRO SAFE CORPORATION OF AMERICA 3549 N MOVIEFONE, INC. 3728 N ABC ENTERPRISES 3553 N MANLEY COMMUNICATION SERVICES 3729 N E OFFICE CORPORATION 3555 N RAPMIL CORPORATION 3732 N INTERNATIONAL TELESIS, INC. 3566 N RDC TELEMANAGEMENT, INC. 3733 R 900 VOICE, INC. 3567 N OAK CREEK INFORMATION CORP. 3733 R EARLYBIRD AWARDS, INC. 3569 N 555 FLOWERS, INC. 3734 N BOWIE COMMUNICATIONS 3573 N GRANT JORGENSON 3737 N SYRACUSE NEWSPAPER 3574 N SELF MAGAZINE 3739 N ANNE E. CURTIS COMMUNICATIONS 3579 N WESLEY MEDICAL CENTER 3742 N WORLD WIDE NETWORKS 3583 R TEXAS MEDICAL PAGING 3743 N O'BRIEN COMMUNICATION SERVICES 3584 N ENGULF & DEVOUR 3745 N BOWIE COMMUNICATIONS 3587 N NANCY M. JONAS 3746 N KPT MANAGEMENT CORP. 3591 N CAROL SHAPIRO 3747 N GRANT JORGENSON 3592 N GARY W. ANDERSON 3748 N US WEST MARKETING RESOURCES 3593 N TAS ENTERPRISES 3764 N HOWARD JONAS 3594 N CAROL SHAPIRO 3766 N CURTIS WORLDWIDE ENTERPRISES, INC. 3595 N CAROL SHAPIRO 3767 N ABRAM I. SACHS 3596 N GARY W. ANDERSON 3768 N BEDFORDSHIRE COMMUNICATIONS 3597 N ALL AMERICAN TELEPHONE CO. 3772 N JR NETWORK SERVICES 3598 N CAROL SHAPIRO 3782 N TANGLEWOOD COMMUNICATION SVCS. 3599 N CORCORAN GROUP, INC. 3784 N PORTLAND INFORMATION SERVICES 3618 N EDNA L. MCKINLEY 3786 N BT SERVICES, INC. 3624 N WM. HARDASH COMMUNICATIONS 3787 N RAFFERTY ASSOCIATES 3625 N CAROLINE MEGGINSON 3788 N KLM & R COMMUNICATIONS 3627 N SOURCE 3792 N A.S.M. COMMUNICATION SERVICES 3628 N SOURCE 3797 N O'BRIEN COMMUNICATION SERVICES 3629 N AUDREY COX 3825 N PROMOLINE, INC. 3632 N JR NETWORK SERVICES 3831 N FTD DIRECT ACCESS, INC. 3634 N FINANCIAL TELESYS CORP. 3833 R TIME WARNER COMMUNICATIONS 3636 N CURTIS WORLDWIDE ENTERPRISES, INC. 3834 N J.S. TELE-COM SERVICES 3637 N BUSINESS EDGE GROUP 3835 N J & T TELECOM CORP. 3642 N WEDDINGFONE, INC. 3836 N PORTLAND INFORMATION SERVICES 3644 N ROBERT N. MARKHAM 3838 N EXCELL AGENT SERVICES 3645 N CHARLOTTE DUNCAN 3844 N LUBBOCK COMMUNICATIONS SVCS. 3647 N MF INDUSTRIES 3853 N DPC TELE-SERVICES 3648 N GLOBAL TECHNOLOGY CORP. 3854 N AURAND 3653 N LEVITHI ASSOCIATES 3855 N O'BRIEN COMMUNICATION SERVICES 3655 N TELEPHONE BROADCASTING SYSTEMS 3857 N DETAILS MAGAZINE 3657 N ROB-TEL SERVICES 3862 N NANCY KAHANE 3662 N RANDOM ACCESS CORP. 3863 N SEICOMM INFORMATION SERVICES 3664 N ACCESS INFORMATION NETWORK 3865 N STREET & SMITH'S 3665 N STELLA WEISS 3866 R HUNTSVILLE TIMES 3666 N DAVID L. SIMONS 3867 N CECELIA DOWNS 3667 R NEW-CELL, INC. 3868 R US WEST NEW VECTOR GROUP 3668 N JAM RESEARCH 3869 N BTNA/TYMNET 3669 N T & J INFORMATION 3872 N AIRWAYS CORPORATION 3672 N VIRGINIA BEACH COMMUNICATIONS CORP. 3873 N JETSET TOURS, INC. (NA) 3673 N UNICOM CORPORATION 3874 N STREET & SMITH'S 3674 N RDC TELEMANAGEMENT, INC. 3876 N SAM HAIM 3675 N PENTA RESOURCES CORP. 3877 N J & T TELECOM CORP. 3676 N ROBERT A. BLAISCH 3878 N ABRAM I. SACHS 3677 N JR NETWORK SERVICES 3879 N AUDREY COX 3678 N TELEPHONE BROADCASTING SYSTEMS 3888 N RITCHFIELD TELCOM SERVICES 3679 N D.G. TELECOM SERVICES 3889 N ABRAM I. SACHS 3682 N NANCY M. JONAS 3923 N ABRAM I. SACHS 3683 N INTERNATIONAL TELEPHONE MAIL 3924 N RDC TELEMANAGEMENT, INC.

TYPE N - NATIONAL, R - REGIONAL 58 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 3925 N ELLEN SILVERBERG 4276 N MICHAEL TABOR 3926 N ABRAM I. SACHS 4277 N COMPUSERVE INCORPORATED 3932 R STAR-TELEGRAM OPERATING, LTD. 4278 N ACCESS UNLIMITED USA 3933 N M.L.C. COMMUNICATIONS 4279 N G & W COMMUNICATIONS 3934 N CHAMBERLAIN COMMUNICATIONS 4282 N NEXUS COMMUNICATIONS, INC. 3935 N T & J INFORMATION 4283 N HAMMERLY PRODUCTIONS 3936 N M.L.C. COMMUNICATIONS 4285 N SPARKS COMMUNICATIONS 3937 N TELEDONTICS, INC. 4286 N ICS NETWORKS, INC. 3938 N M.L.C. COMMUNICATIONS 4287 N VIRGINIA BEACH COMMUNICATIONS CORP. 3939 N PRO SAFE CORPORATION OF AMERICA 4288 N COMMUNICATIONS VENTURE SVCS., INC. 3944 N MANLEY COMMUNICATION SERVICES 4289 N INTERACTIVE VIDEO ENTERPRISES 3947 N SANTA FE NEW MEXICAN 4292 N OCEAN ATLANTIC FINANCIAL INVESTMENT 3948 N SARAH SACHS 4294 N CABLE & WIRELESS 3962 N CHRISTINE MARLIN 4295 R RICHARD S. BELL 3968 N SEATTLE-COM L.L.C. 4297 N EXOTIC SERVICES, INC. 3973 N FAC PINS 4321 N CABLE & WIRELESS 3975 N BUC-VIN TELESERVICES 4322 N READY CALL, INC. 3976 N HOOT N HOLLER PUBLICATIONS, INC. 4323 N GLOBAL TECHNOLOGY CORP. 3977 N BUSINESS TO CONSUMER NETWORK 4324 N A.S.M. COMMUNICATION SERVICES 3987 N O'BRIEN COMMUNICATION SERVICES 4325 N HEALTH VENTURE SVCS., INC. 3993 N DIANE BAKER-LOCKWOOD 4326 N DIVAD TELECOM 3996 N BRENDAN CORP. 4327 R NEWSWEEKLY 4001 N BTNA/TYMNET 4327 R METRO TELECOMM SERVICES 4002 N BTNA/TYMNET 4327 R CAHOKIA-DUPO HERALD 4015 N OCEAN ATLANTIC COMMUNICATIONS 4327 R OAKLAND PRESS 4022 R HERALD-S.C. 4328 N GEICO INSURANCE CO. 4040 R HERALD-S.C. 4332 N SUMMERHILL VENTURES, INC. 4040 R MERCURY NEW MEDIA 4333 N RWH INFORMATION CORP. 4044 R HERALD-S.C. 4334 N MCI MAIL 4054 N DANA N. MCKINLEY 4339 N RALEIGH TELECOM CORP. 4063 N JOANN T. SHAPIRO 4342 N RITA DUSSEAU 4083 N JOANN T. SHAPIRO 4343 N REBECCA SHAPIRO 4087 N JOANN T. SHAPIRO 4345 N BOO ENTERPRISES 4100 N HERITAGE INFORMATION SERVICES 4346 R COWLES PUBLISHING CO. 4123 N AT&T 4348 N ENGULF & DEVOUR 4141 N SYRACUSE NEWSPAPER 4353 N JRR RESEARCH, INC. 4200 R ANCHORAGE DAILY NEWS 4354 N B.H. COMMUNICATION SERVICE 4205 N CSR ASSOCIATES 4355 N SARAH SACHS 4212 N AIR ONE, INC. 4356 N ALTIMONT COMMUNICATIONS 4221 N TELCO PLANNING 4359 R HERALD-WA. 4222 N ASSOC. VENTURE SVCS., INC. 4362 N CROSSCONNECT 4224 N MARYLAND TEL-COM SERVICES 4363 N MERCER COMMUNICATIONS 4225 N TELPLEX INTERNATIONAL LLC 4364 N CMR COMPANY 4226 N 555 INFO NET 4365 N CAROLINE MEGGINSON 4227 N PHONE PROGRAMS, INC. 4366 N SNOMIS CORP. 4229 R NEW-CELL, INC. 4367 N TELESERVE, INC. 4232 N J.S. TELE-COM SERVICES 4368 R ENCORE AGENCY 4233 N FLAMELESS HEAT, INC. 4368 R PACIFIC BELL-NATL. ACCOUNTS 4237 N MADEMOISELLE 4369 N NORSICAN COMMUNICATIONS, INC. 4238 N TARGET REALTY 4372 N TELCO PLANNING 4239 N MCI MAIL 4373 N NETWORK BILLING SYSTEMS, LLC 4242 R GREGORY WING 4374 N BUC-VIN TELESERVICES 4246 N ENHANCED TELEPHONE SERVICES, INC. 4375 R FLORIDA POWER & LIGHT COMPANY 4252 N ELLEN SILVERBERG 4376 N LUBBOCK COMMUNICATIONS SVCS. 4253 N TELE-LAWYER, INC. 4377 N ACCESS INFORMATION NETWORK 4255 N SARAH SACHS 4378 N ASSOC. VENTURE SVCS., INC. 4256 N COMPUTER LOAN ORG. SYS. INC 4382 N CURTIS WORLDWIDE ENTERPRISES, INC. 4257 N BILLY M. COSPER, JR. 4383 N MODAMAS INC 4261 N ADAM/CHARLES TEXTILES 4384 N INTERNATIONAL TELESIS, INC. 4262 N MATT OLSON 4386 R MUSKEGON CHRONICLE 4264 N BELLSOUTH WIRELESS, INC. 4386 R PACIFIC BELL-NATL. ACCOUNTS 4265 N THIRD STREET CHATTER 4387 N CORPORATE TELEMANAGEMENT GROUP 4266 N MEDIA VENTURE SVCS., INC. 4388 N A.S.M. COMMUNICATION SERVICES 4267 N COMPUSERVE INCORPORATED 4389 N BARBADOS TELE-COM 4268 N TARGET REALTY 4393 N NAND CORP. 4269 N COX TECHNOLOGY INVESTMENTS 4399 N PATTI LOTTERMOSER 4272 N STEVEN R. KATZ 4414 R BRITE VOICE SYSTEMS 4273 N NORTHWEST NEVADA TELCO 4422 R LANCASTER NEWSPAPERS, INC. 4274 N BRIDE'S MAGAZINE 4422 R JOSEPH BASIL MILLER 4275 N LOS ANGELES GARLIC FESTIVAL 4424 R GCI CORP.

TYPE N - NATIONAL, R - REGIONAL 59 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 4425 N RAMBLEWOOD COMMUNICATIONS 4628 N GEICO INSURANCE CO. 4426 R KTVU, INC. 4631 N LDC ENTERPRISES 4426 R BLUE RIDGE MOUNTAIN WATER, INC. 4632 N BUDDY HOWE 4427 N CT FINANCIAL 4633 N CHAMBERLAIN COMMUNICATIONS 4428 N GEICO INSURANCE CO. 4634 N CURTIS WORLDWIDE ENTERPRISES, INC. 4429 N M&C MINNESOTA, INC. 4635 N BILLY M. COSPER, JR. 4433 R GTE 4637 N AIKATERINI ASSOC. 4434 N BOWIE COMMUNICATIONS 4639 N A. JACOB ARTHUR ASSOC. 4435 N PENTA RESOURCES CORP. 4643 R COWLES PUBLISHING CO. 4440 N INPHONEMATION, INC. 4645 N HAMMERLY PRODUCTIONS 4441 R INPHONEMATION, INC. 4646 N CANADA POST CORPORATION 4442 N DEENA JORGENSON 4647 N 555 INFO NET 4447 N JERRY LOCKWOOD 4648 R NEWS TRIBUNE 4448 N RALEIGH TELECOM CORP. 4652 R NYNEX-NEW YORK 4455 N WASHINGTON POST COMPANY 4652 R SOUTHWESTERN BELL - TEXAS 4456 N DEAN R. CHAMBERLAIN 4652 R US WEST COMMUNICATIONS 4458 N ABCD, INC. 4654 N EDNA L. MCKINLEY 4462 N J.A.H. ENTERPRISES 4655 N ATLANTIC WEST INTERNATIONAL 4463 N INSTITUTIONAL INVESTOR 4656 N MARY MOEHLE 4465 N DONALD SIMMONS 4657 N AIKATERINI ASSOC. 4466 N ACCESS UNLIMITED USA 4658 N PRO SAFE CORPORATION OF AMERICA 4467 N NORTHWEST FARMER-STOCKMAN, INC. 4659 N BICOM 4468 N SYNCRONET, INC. 4662 N MICHIGAN NAT'L BANK 4472 N TZS CORP. 4664 N HIGH INTEREST COMMUNICATIONS 4473 N J & T TELECOM CORP. 4666 R INSTITUTIONAL INVESTOR 4475 N PROMOLINE, INC. 4667 R PACIFIC BELL-OPERATOR SERVICES 4476 N CROSSCONNECT 4668 N ATLANTIC WEST INTERNATIONAL 4477 N MATT OLSON 4669 N RITA DUSSEAU 4478 N KAREN LOCKWOOD 4672 N ASSOC. VENTURE SVCS., INC. 4482 N AIRWAYS CORPORATION 4673 N AIKATERINI ASSOC. 4483 N RAFFERTY ASSOCIATES 4674 N RGM COMMSTAR 4487 N MUSIC LINE 4676 R GREGORY WING 4488 N FINANCIAL TELESYS CORP. 4676 R SOUTHAM INC. 4500 R TIMES-PICAYUNE PUBLISHING CORP. 4677 N ABC DAYTIME CIRCLE, INC. 4505 N RENEGADE SOFTWARE, INC. 4678 N ACP CORP 4510 N JETSET TOURS, INC. (NA) 4681 N SANTA FE NEW MEXICAN 4515 N JETSET TOURS, INC. (NA) 4682 N G-R TELCOM SERVICES, INC. 4523 N ABC ENTERPRISES 4683 N TELEHOTEL ENTERPRISES, INC. 4524 N STEPHEN SMITH 4684 N C&C FINANCIAL & COMMUNICATIONS 4526 N GLAMOUR MAGAZINE 4685 R KABC RADIO, INC. 4527 N PORTLAND INFORMATION SERVICES 4686 N INTELLICOM 4528 N GEICO INSURANCE CO. 4687 N MUSIC LINE 4529 N DONALD SIMMONS 4688 N AIKATERINI ASSOC. 4532 N PRODUCT VENTURE SERVICES, INC. 4689 N ICS HOLDINGS COMPANY 4533 N JESSICA JONAS 4693 N CAROLINE MEGGINSON 4534 N KFT, INC. 4695 N JERRY LOCKWOOD 4536 N ASC 4696 N G-R TELCOM SERVICES, INC. 4538 N UNASOURCE MARKETING GROUP 4698 N AGR ASSOCIATES 4539 N PAUL SIMONS 4711 N TOP LINE RESOURCES 4542 N KATHLEEN S. ANDERSON 4721 N STEVEN D. MONTGOMERY 4543 N NEW MEDIA VENTURES, INC. 4722 N BUDDY HOWE 4545 N SCHERERS COMMUNICATIONS 4723 N B & C ENTERPRISES 4546 N MINDSCAPE 4724 R GREGORY WING 4549 N ELLEN SILVERBERG 4725 N ACCESS UNLIMITED USA 4554 N J&S COMMUNICATIONS SVCS. 4726 N CAROLYN CHAMBERLAIN 4555 N METRO ONE DIRECT 4727 N COX TECHNOLOGY INVESTMENTS 4556 N JFC TELECOMM, INC. 4728 N GEICO INSURANCE CO. 4562 N PENTA RESOURCES CORP. 4729 N RANDOM ACCESS CORP. 4563 N JOLT COMMUNICATIONS, INC. 4732 N RGM COMMSTAR 4567 N 900 VOICE, INC. 4733 N ATLANTIC WEST INTERNATIONAL 4568 N RCI LONG DISTANCE NEW ENGLAND 4734 N LDC ENTERPRISES 4569 N ALL AMERICAN TELEPHONE CO. 4735 N RGM COMMSTAR 4582 N D. J. ENTERPRISES 4736 N ACCESS UNLIMITED USA 4588 N DW FITNESS 4737 N TELEREP, INC. 4600 N ONCOR COMMUNICATIONS, INC. 4738 N TETHRA CORP. 4603 N BF&L 4739 N MICHAEL SMITH 4606 N HEALTH VENTURE SVCS., INC. 4742 N JAMES F. BISHER, JR. 4625 N B & C ENTERPRISES 4744 N TOP LINE RESOURCES 4626 N PHON-E 4746 N CAROLINE MEGGINSON 4627 N CHRISTINE MARLIN 4747 N US NETWORK SERVICES

TYPE N - NATIONAL, R - REGIONAL 60 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 4748 N MICHAEL ABRAHAMS 4966 N ELAINE CALLINAN 4752 N BT HOLDINGS, INC. 4967 N LINDA D. ANDERSON 4753 R CAHOKIA-DUPO HERALD 4968 N EXCELL AGENT SERVICES 4754 N ACTIVITY DIRECTORIES INTL., INC. 4972 R GEORGIA TELEVISION COMPANY 4762 N NETWORK BILLING SYSTEMS, LLC 4973 N CAROLYN HENRICK 4763 N BUSINESS TO CONSUMER NETWORK 4975 N AGR ASSOCIATES 4764 N SAN DIEGO TELE-SERVICES 4976 N HANK PRENSKY 4766 N YGBK CORPORATION 4986 R BRITE VOICE SYSTEMS 4767 N NETWORK BILLING SYSTEMS, LLC 4993 N ACCESS INFORMATION NETWORK 4769 N KATHLEEN S. ANDERSON 4999 N ALL AMERICAN TELEPHONE CO. 4771 R GRAND RAPIDS PRESS 5001 N IQ, INC. 4772 R GRAND RAPIDS PRESS 5002 N IQ, INC. 4773 R GRAND RAPIDS PRESS 5003 N IQ, INC. 4774 R GRAND RAPIDS PRESS 5004 N IQ, INC. 4775 R GRAND RAPIDS PRESS 5005 R OREGONIAN PUBLISHING CO. 4776 N BELLSOUTH WIRELESS, INC. 5005 R ADVANCED PURE WATER CORP. 4777 N STATE OF NEVADA 5026 N BF&L 4778 N CHRISTOPHER P. OBERLE 5027 N DEAN R. CHAMBERLAIN 4779 N INT'L DEVELOPMENT & ENTERPRISE 5050 N CITIZENS UTILITIES 4786 N ENVIRONMENT CANADA 5080 N 2PM GROUP LTD. 4787 N B & A ENTERPRISES 5083 N KPT MANAGEMENT CORP. 4800 N MORTGAGE MARKET INFO SVCS 5100 R BIRMINGHAM NEWS COMPANY 4813 N WM. HARDASH COMMUNICATIONS 5101 R BIRMINGHAM NEWS COMPANY 4821 N GLOBAL TECHNOLOGY CORP. 5102 R BIRMINGHAM NEWS COMPANY 4822 N BARBADOS TELE-COM 5103 R BIRMINGHAM NEWS COMPANY 4824 N ICS NETWORKS, INC. 5104 R BIRMINGHAM NEWS COMPANY 4825 N SINNAMON PR0DUCTIONS 5111 R OAKLAND PRESS 4827 N D. J. ENTERPRISES 5115 N STARMAGIC MEDIA SERVICES 4829 N TETHRA CORP. 5123 R OAKLAND PRESS 4835 N ACCESS INFO-NET, INC. 5151 R AMERITECH INFO. INDUSTRY SVCS. 4837 N CAC TELECOMM, INC. 5200 R HERITAGE INFORMATION SERVICES 4839 N TARGET REALTY 5200 R COWLES MEDIA COMPANY 4841 N TUNA CORP. 5205 N CSR ASSOCIATES 4842 N JILL CARTER CONSULTING 5223 N 800 CONCEPTS LLC 4843 N WM. HARDASH COMMUNICATIONS 5224 N BELAIR COMMUNICATIONS, INC. 4844 N DPC TELE-SERVICES 5225 N MINDSCAPE 4846 N MINDSCAPE 5226 N SEATTLE-COM L.L.C. 4848 N RAMBLEWOOD COMMUNICATIONS 5227 N RALEIGH TELECOM CORP. 4849 N MARK TELECOM, LTD. 5228 N BELAIR COMMUNICATIONS, INC. 4852 N MICHAEL ABRAHAMS 5232 R QUALICOM 4853 N MARY MOEHLE 5233 N DEENA JORGENSON 4857 N EILEEN LOCKWOOD 5237 N ROBERT N. MARKHAM 4862 N SARAH SACHS 5239 N MADISON TELEMEDIA 4863 N BUC-VIN TELESERVICES 5245 N ELAINE CALLINAN 4864 N INTERNATIONAL TELESIS, INC. 5247 N LOS ANGELES GARLIC FESTIVAL 4865 N BT HOLDINGS, INC. 5248 N AYSM CORP. 4866 N SNOMIS CORP. 5252 R PACTEL ELECTRONIC PUBLISHING SVCS. 4867 R NEVADA BELL 5252 R AMERITECH ADVERTISING SERVICES 4868 N JEFF SEAL 5253 N PACIFIC RIM ADVERTISING 4869 N JAM RESEARCH 5254 N SUSAN M. STONE 4872 N INT'L DEVELOPMENT & ENTERPRISE 5255 N CAROLYN HENRICK 4873 N PAUL SIMONS 5258 N RICHARD JOHNSON MARKETING 4876 N 2PM GROUP LTD. 5262 N FAC PINS 4877 N PCM, INC. 5263 N G & W COMMUNICATIONS 4878 N NAND CORP. 5264 R KALAMAZOO GAZETTE 4879 N ENGULF & DEVOUR 5265 N SOTIRIOS ASSOC. 4884 N BANKCARD MARKETING NETWORK 5267 R WHYT-FM 4887 N SARAH SACHS 5269 N ORRIN CHARM 4888 N J.S. TELE-COM SERVICES 5271 N STANLEY H. KAPLAN EDUCATION CTR. 4889 N NOR CORP. 5272 N SYLVIA BLAISCH 4892 N AIRWAYS CORPORATION 5273 N DIVAD TELECOM 4897 N TELESERVE, INC. 5274 N BRIDE'S MAGAZINE 4911 R CONSUMERS GAS 5275 R NEW ATHENS JOURNAL 4928 N ABCD, INC. 5276 N ARLINDO DASILVA 4929 N BRIAN WEISBERG 5277 N G & W COMMUNICATIONS 4932 N INTELISYS TECHNOLOGICA, INC. 5278 N RAY-TEL, INC. 4934 N RICHARD A. STONE 5282 N TANGLEWOOD COMMUNICATION SVCS. 4945 N CARLTON TELEPHONICS CORP. 5283 N NOR CORP. 4947 N MICHAEL ABRAHAMS 5284 N RALEIGH TELECOM CORP. 4949 R LEDGER DISPATCH 5288 N SYLVIA BLAISCH

TYPE N - NATIONAL, R - REGIONAL 61 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 5289 N INTERACTIVE VIDEO ENTERPRISES 5464 N BRIAN WEISBERG 5291 N D. J. ENTERPRISES 5466 N MF INDUSTRIES 5292 N INPUT COMMUNICATIONS 5472 N NORTHWEST NEVADA TELCO 5293 N BEJAY COMMUNICATIONS CORP. 5475 N NAND CORP. 5294 N CABLE & WIRELESS 5477 N STELLA WEISS 5295 N WILL KAHANE 5478 R HOMES FOR SALE 5296 N TERRIAN CORP. 5478 R TARGET REALTY 5298 N WILL KAHANE 5482 N OCEAN ATLANTIC COMMUNICATIONS 5299 N MICHAEL B. MAW 5484 N RAY-TEL, INC. 5322 R LEGAL COMMUNICATION CORP. 5487 N FAC PINS 5323 R TIMES LEADER 5488 N MARKET SHARE, INC. 5323 R HIGHLAND NEWS LEADER 5492 N JERRY LOCKWOOD 5324 N LAW OFFICES OF M.I. ROSENBERG 5494 N INTEGRATED DATA CONCEPTS 5325 N RDC TELEMANAGEMENT, INC. 5501 N MIDDLE AMERICA TALK NETWORK 5326 N FIBERLINK, INC. 5502 N MIDDLE AMERICA TALK NETWORK 5327 N ELIZABETH DOWLING 5515 N QUATERRA COMMUNICATIONS CORP. 5328 N JARDINE TELE-COM 5522 N PEPSICO 5329 N LEGI-TECH 5523 N DEJA LOCKWOOD 5333 N BH INFORMATION CORP. 5525 N NAMSON CONSULTING GEOLOGISTS 5338 N GRANT JORGENSON 5526 N ADVANTIS 5342 N PENTA RESOURCES CORP. 5532 N SAN DIEGO TELE-SERVICES 5344 N WASHINGTON POST COMPANY 5533 N BUSINESS TO CONSUMER NETWORK 5345 R O'FALLON PROGRESS 5539 N KNR ASSOCIATES 5347 N BT TELESIS, INC. 5544 N PEPSICO 5348 N CARLTON TELEPHONICS CORP. 5546 N STARMAGIC MEDIA SERVICES 5353 R LEDGER DISPATCH 5550 N ACCESS UNLIMITED USA 5355 N KLM & R COMMUNICATIONS 5551 N WHOLE EARTH GREEN PAGES 5359 N GARY W. ANDERSON 5552 R KALAMAZOO GAZETTE 5363 N JFC TELECOMM, INC. 5553 R KALAMAZOO GAZETTE 5366 N DREAM THEME, INC. 5554 R KALAMAZOO GAZETTE 5367 N DIVAD TELECOM 5556 N NNT 5368 N D.K. COMMUNICATIONS L.L.C. 5557 N NORTHWEST NEVADA TELCO 5369 N ALADDIN 5558 N JAMES MARLIN 5372 N JFR NUMBER SYSTEMS 5559 N STATE OF NEVADA 5375 N NANCY KAHANE 5562 N JRR RESEARCH, INC. 5377 N MINDSCAPE 5566 N PEPSICO 5378 N GAME SERVICES CORPORATION 5569 N CREATIVE CALL MANAGEMENT 5382 N ROB-TEL SERVICES 5577 N DONNA BROWN 5383 N FTD DIRECT ACCESS, INC. 5582 N BEVERLYWOOD COMM. 5384 N STEVEN D. MONTGOMERY 5588 N PEPSICO 5386 R VOX-TEL 5600 R KGO-ABC/CAPITAL CITIES 5387 N RAY-TEL, INC. 5622 N NBC, INC. 5388 N DEENA JORGENSON 5624 N EFGH, INC. 5393 N T & J INFORMATION 5625 N NORTHWEST NEVADA TELCO 5394 N HANK PRENSKY 5632 N RALEIGH TELECOM CORP. 5396 N PESCADERO COMMUNICATIONS 5633 N JOYCE S. MARKHAM 5397 N FLAMELESS HEAT, INC. 5634 N MICHAEL TABOR 5398 N TELECOM TECHNOLOGIES 5637 N ICS NETWORKS, INC. 5400 N CMR COMPANY 5638 N LIONESS ASSOCIATES 5411 N METRO ONE DIRECT 5639 N BEVERLYWOOD COMM. 5423 N VIRGINIA BEACH COMMUNICATIONS CORP. 5642 N OCEAN ATLANTIC FINANCIAL INVESTMENT 5424 N MATHEWS AERIAL SERVICES, INC. 5644 N AGR ASSOCIATES 5425 N STREET & SMITH'S 5646 N KIRA CORP. 5426 N BEVERLYWOOD COMM. 5647 N MICHAEL TABOR 5427 N WALTER MALAKOFF 5652 N KAREN LOCKWOOD 5432 N INTEGRATED DATA CONCEPTS 5653 N TELEJOKE SERVICES, INC. 5433 N HEALTH VENTURE SVCS., INC. 5654 N RICHARD JOHNSON MARKETING 5434 N ROB-TEL SERVICES 5655 N MICHAEL TABOR 5438 N DARREN CHAFFEE 5656 N GANNETT CO., INC. 5444 N NEWSPAPER NETWORK 5657 N NNT 5445 N DIANE BAKER-LOCKWOOD 5658 N HANK PRENSKY 5447 N CHRISTINE MARLIN 5664 N BG ASSOCIATES 5452 R NEWSWEEKLY 5665 R BELL ATLANTIC 5453 N ELAINE CALLINAN 5666 N HANK PRENSKY 5454 R BELL ATLANTIC 5669 N INTERACTIVE VIDEO ENTERPRISES 5455 N SEAWYF, INC. 5672 R KABC RADIO, INC. 5456 N RICHARD JOHNSON MARKETING 5673 N DEJA LOCKWOOD 5458 N CATHY S. SURACE 5674 N ADAM/CHARLES TEXTILES 5460 N JAMES E. BOGAR 5677 R BLUE RIDGE MOUNTAIN WATER, INC. 5462 N ALADDIN 5678 N ALADDIN

TYPE N - NATIONAL, R - REGIONAL 62 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 5680 N MOBILE PRESS REGISTER, INC. 6006 N SUSAN M. STONE 5682 N BEVERLYWOOD COMM. 6060 N MID ATLANTIC TELECOM 5686 R KHQ INCORPORATED 6063 N KPT MANAGEMENT CORP. 5687 N MUSIC LINE 6064 N JAMES F. BISHER, JR. 5691 N MICHAEL ABRAHAMS 6069 N JAMES E. BOGAR 5692 N NANCY M. JONAS 6083 N JOANN T. SHAPIRO 5693 N SNOWMASS COMMUNICATIONS 6100 N TELEMATION INTERNATIONAL 5697 N SNOWMASS COMMUNICATIONS 6102 R WIOD, INC. 5711 N PHONE PROGRAMS, INC. 6161 N REBECCA SHAPIRO 5722 N ALADDIN 6200 N TODAY'S HOMES 5723 N A & H ENTERPRISES 6202 R WWRM, INC. 5728 R POST-NEWSWEEK STAT. - SAN ANTONIO 6211 R WTVD/CHANNEL 11 5742 N PALM BEACH COMMUNICATIONS 6221 N JENNIFER LEOPOLD 5747 N ALADDIN 6222 N BILLY M. COSPER, JR. 5757 N SCHERERS COMMUNICATIONS 6223 N ROB-TEL SERVICES 5759 N RICHARD JOHNSON MARKETING 6224 N RAY-TEL, INC. 5762 N HAMMERLY PRODUCTIONS 6225 N BH INFORMATION CORP. 5765 R EVENING JOURNAL ASSOCIATION 6227 N BELINDA S. SIDES 5765 R NEW ATHENS JOURNAL 6228 N MARYLAND TEL-COM SERVICES 5772 R POST-NEWSWEEK STATIONS HOUSTON 6229 N ACCESS INFO-NET, INC. 5777 N WESLEY MEDICAL CENTER 6232 N EDNA L. MCKINLEY 5784 N JOEL PACKER 6233 N LDC ENTERPRISES 5787 N DARREN CHAFFEE 6234 N RICHARD A. STONE 5788 N JEFF SPANG 6236 N SILVERSTONE COMMUNICATIONS 5792 N NAMSON CONSULTING GEOLOGISTS 6238 N MIKE MOEHLE 5797 N JOEL PACKER 6239 N BT SERVICES, INC. 5800 R COWLES MEDIA COMPANY 6242 N SNOWMASS COMMUNICATIONS 5801 N KATHLEEN A. ANDERSON 6243 N DEREK NESS 5802 N KATHLEEN A. ANDERSON 6244 N ORRIN CHARM 5803 N KATHLEEN A. ANDERSON 6246 N B & A ENTERPRISES 5804 N KATHLEEN A. ANDERSON 6247 N CATHY S. SURACE 5805 N KATHLEEN A. ANDERSON 6248 N A & H ENTERPRISES 5823 N SOFT PRODUCTS, INC. 6249 N KENSINGTON PHYSICAL THERAPY 5824 N ECCO, INC. 6253 N RENEGADE SOFTWARE, INC. 5829 N ECCO, INC. 6255 R PACTEL ELECTRONIC PUBLISHING SVCS. 5835 N BRIAN WEISBERG 6255 R PA. NEWSPAPER PUBLISHERS' ASSN. 5836 N SEAWYF, INC. 6256 N RICHARD LEVINE 5838 N SEAWYF, INC. 6257 N OAK CREEK INFORMATION CORP. 5839 N FIBERLINK, INC. 6258 N ROBERT N. MARKHAM 5842 N BT TELECOM, INC. 6262 N SEAWYF, INC. 5843 N HANK PRENSKY 6263 R MARISSA JOURNAL 5844 N PLANDOME COMMUNICATIONS 6263 R NYNEX-NEW YORK 5847 N BT SERVICES, INC. 6264 N PLANDOME COMMUNICATIONS 5852 N RICHARD JOHNSON MARKETING 6266 N TELESERVE, INC. 5858 N AMERITECH COMMUNICATIONS 6267 N MARK TELECOM, LTD. 5862 N MERCER COMMUNICATIONS 6268 N PLANDOME COMMUNICATIONS 5863 N WALTER MALAKOFF 6269 N MARK PAUL BORNSTEIN 5864 N KATHLEEN S. ANDERSON 6272 N JAY R. SHELL, P.C. 5865 N ELAINE CALLINAN 6273 N R.P.W. COMMUNICATIONS 5867 N KAREN LOCKWOOD 6274 N STEPHEN SMITH 5872 N NAMSON CONSULTING GEOLOGISTS 6275 N MARK TELECOM, LTD. 5875 R TEXAS MEDICAL PAGING 6277 N DAVID H. LOCKWOOD 5877 N SYLVIA BLAISCH 6278 R TIME WARNER COMMUNICATIONS 5878 N IJKL, INC. 6279 N DONALD SIMMONS 5879 N NAMSON CONSULTING GEOLOGISTS 6282 N TELECOMPUTE CORPORATION 5883 N WALTER MALAKOFF 6283 N IJKL, INC. 5888 R KTVU, INC. 6284 N A & H ENTERPRISES 5889 N DAVID LUTZ, ESQ. 6285 N B & C ENTERPRISES 5893 N VOGUE 6287 R CANADIAN COAST GUARD 5896 N MERCER COMMUNICATIONS 6288 N NEUROLOGY CLINIC, P.C. 5898 N SEATTLE-COM L.L.C. 6289 N THOMAS J. HUGHES, III 5911 R C.H. EPPERT 6292 N ECLIPSE HOLDINGS, INC. 5927 N WALTER MALAKOFF 6293 N MANLEY COMMUNICATION SERVICES 5945 N TAKEOUT TAXI HOLDINGS, INC. 6294 N BANK OF MONTREAL 5959 N DDI CORPORATION 6296 N WALTER MALAKOFF 5962 N SANDRA SPANG 6298 N RITCHFIELD TELCOM SERVICES 5969 N JAMES MARLIN 6299 R WTVD/CHANNEL 11 5991 R WHIO, INC. 6300 N TELEMATION INTERNATIONAL 5999 R OAKLAND PRESS 6323 N ELVA GRAUEL 6000 N HALICO, INC. 6324 N HIGH INTEREST COMMUNICATIONS

TYPE N - NATIONAL, R - REGIONAL 63 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 6325 R O'FALLON PROGRESS 6460 N SUMMIT COMMUNICATIONS 6327 N NEBS BUSINESS FORMS LTD. 6463 N SELF MAGAZINE 6328 N BRENDAN CORP. 6464 N ENGULF & DEVOUR 6333 N NEXUS COMMUNICATIONS, INC. 6465 N SEATTLE-COM L.L.C. 6334 N CHARLOTTE DUNCAN 6466 N J&S COMMUNICATIONS SVCS. 6335 N GAITHER COMMUNICATIONS 6467 N STELLA WEISS 6336 N 800 CONCEPTS LLC 6468 N DEJA LOCKWOOD 6337 N PC-TOTES, INC. 6472 N BANKCARD MARKETING NETWORK 6338 N PAN & ASSOCIATES 6476 N TELCO PLANNING 6342 N K.M. COMMUNICATION SERVICES 6477 N OAK CREEK INFORMATION CORP. 6344 N ANDREW PENN 6478 N SGR NETWORK SERVICES 6350 N ANNAPOLIS SAILYARD 6482 N LAW OFFICES OF M.I. ROSENBERG 6351 N JENNIFER LEOPOLD 6500 R TIMES-PICAYUNE PUBLISHING CORP. 6352 N R.P.W. COMMUNICATIONS 6500 R NEWS TRIBUNE 6353 N R.P.W. COMMUNICATIONS 6526 N ROCK-TEL COMMUNICATIONS 6354 N WATERFRONT COMMUNICATIONS 6527 N KAR-TEL COMMUNICATIONS 6355 N WATERFRONT COMMUNICATIONS 6529 N ELVA GRAUEL 6356 N WATERFRONT COMMUNICATIONS 6532 R NYNEX-NEW YORK 6357 N WATERFRONT COMMUNICATIONS 6533 N ICS HOLDINGS COMPANY 6358 N WATERFRONT COMMUNICATIONS 6534 N AMERICAN INTL. ENTERPRISES 6362 N LANSDALE COMMUNICATIONS 6536 N RICHARD LEVINE 6363 N REBECCA SHAPIRO 6537 N KIRA CORP. 6366 N TELESERVE, INC. 6543 N HANNAH SHAPIRO 6367 N ELVA GRAUEL 6546 N KAR-TEL COMMUNICATIONS 6368 N CABLE & WIRELESS 6548 N ELVA GRAUEL 6369 N ELVA GRAUEL 6552 N ACCESS INFO-NET, INC. 6372 N LANSDALE COMMUNICATIONS 6553 N MADEMOISELLE 6373 N JERRY LOCKWOOD 6555 N ROBERT A. BLAISCH 6374 N 555 INFO NET 6556 N KAR-TEL COMMUNICATIONS 6377 N NANCO INTERNATIONAL 6563 N KAR-TEL COMMUNICATIONS 6378 N NEUROLOGY CLINIC, P.C. 6565 N GANNETT CO., INC. 6380 N INTELISYS TECHNOLOGICA, INC. 6585 N ABC DAYTIME CIRCLE, INC. 6381 N MOBIUS RESEARCH 6587 N KAR-TEL COMMUNICATIONS 6382 N INTELISYS TECHNOLOGICA, INC. 6596 N TAS ENTERPRISES 6383 N INTELISYS TECHNOLOGICA, INC. 6600 N LEXICOM, INC. 6384 N INTELISYS TECHNOLOGICA, INC. 6622 N BOYD BYERS 6385 N TAS INDUSTRIES 6623 N BG ASSOCIATES 6386 N NBC, INC. 6624 N DREAM THEME, INC. 6387 N WAYNE M. HAMMERLY 6625 N PAGEMART, INC. 6388 N LINDA D. ANDERSON 6626 N YGBK CORPORATION 6389 N TAS INDUSTRIES 6633 N JOY BOYD 6392 N RAK COMMUNICATIONS, INC. 6634 N MARKET POWER, INC. 6393 N FAC PINS 6635 N CRAIG P. LEVINSOHN 6394 N SYLVIA BLAISCH 6636 N RAPMIL CORPORATION 6395 N D.K. COMMUNICATIONS L.L.C. 6637 N ANNAPOLIS SAILYARD 6396 N SPARKS COMMUNICATIONS 6638 N HOOT N HOLLER PUBLICATIONS, INC. 6398 N LOS ANGELES GARLIC FESTIVAL 6639 N SANTA FE NEW MEXICAN 6399 N PHONE PROGRAMS, INC. 6644 N DONNA BROWN 6400 N TODAY'S HOMES 6646 N RITCHFIELD TELCOM SERVICES 6423 N BICOM 6647 N VOX SERVICES, INC. 6424 N D.K. COMMUNICATIONS L.L.C. 6654 N ORRIN CHARM 6425 N DAVID H. LOCKWOOD 6655 R ACC CORP. 6426 N LANSDALE COMMUNICATIONS 6656 N CG COMMUNICATIONS CORP. 6427 N MENAGERIE RESTAURANTS, INC. 6659 N RICHARD LEVINE 6428 N PESCADERO COMMUNICATIONS 6663 N GAME SERVICES CORPORATION 6432 N NEED COMMUNICATIONS, INC. 6664 N CANADA POST CORPORATION 6433 N ROBERT N. MARKHAM 6665 N JESSICA JONAS 6434 N ROBERT G. DREHER 6667 N GAW TELECOM RESOURCES 6436 N JERRY LOCKWOOD 6668 N MERCER COMMUNICATIONS 6439 N CECELIA DOWNS 6669 N FINANCIAL VENTURES SVCS. 6444 N RITCHFIELD TELCOM SERVICES 6672 N DEREK NESS 6446 N CCB TELEPHONY, INC. 6676 R WATERLOO REPUBLIC-TIMES 6447 N G.R.F. COMMUNICATION SERVICES 6677 N REVENUE CANADA 6451 N JENNIFER LEOPOLD 6678 N BERNIE SANSHUCK 6452 N RAY-TEL, INC. 6679 N CAROLYN HENRICK 6453 N TERATECH, INC. 6682 N B.H. COMMUNICATION SERVICE 6454 N NAT REESE 6685 N GAW TELECOM RESOURCES 6455 N A. JACOB ARTHUR ASSOC. 6686 N KIRA CORP. 6458 N SOUTHWESTERN BELL-ST. LOUIS 6687 N ZOOM VIDEO PRODUCTIONS 6459 N PESCADERO COMMUNICATIONS 6688 N DENNY BROWN

TYPE N - NATIONAL, R - REGIONAL 64 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 6689 R GAZETTE NEWSPAPERS 6937 N HIGH INTEREST COMMUNICATIONS 6694 N SGR NETWORK SERVICES 6940 N ANNAPOLIS SAILYARD 6696 R BRITE VOICE SYSTEMS 6942 N TOUCH PHONE PRODUCTIONS, INC. 6697 N B.H. COMMUNICATION SERVICE 6943 N M.J.D. COMMUNICATIONS 6699 N JOY BOYD 6946 N DPC TELE-SERVICES 6700 N ONCOR COMMUNICATIONS, INC. 6952 N LORRIE KLINE KAPLAN 6722 N ROBERT A. BLAISCH 6954 N KENSINGTON PHYSICAL THERAPY 6724 N SGR NETWORK SERVICES 6956 N LEESBURG TEL-COM SERVICES 6725 N SUMMERHILL VENTURES, INC. 6957 N CECELIA DOWNS 6726 N SGR NETWORK SERVICES 6962 N WORD OF MOUTH ADVERTISING 6732 N ELLEN SILVERBERG 6963 N DAVID L. SIMONS 6733 N FTW, INC. 6966 N LEESBURG TEL-COM SERVICES 6734 N MCDONALD COMMUNICATION SERVICES 6969 N CONNIE SIMMONS 6736 R HOMES FOR SALE 6973 N SIDNEY LEVINSOHN 6736 R BANKCARD MARKETING NETWORK 6975 N ROCK-TEL COMMUNICATIONS 6737 N FIRST DATA INTEGRATED SERVICES, INC. 6976 N LEESBURG TEL-COM SERVICES 6738 N J.A.H. ENTERPRISES 6978 N MANLEY COMMUNICATION SERVICES 6739 N ROCK-TEL COMMUNICATIONS 6983 N M.J.D. COMMUNICATIONS 6742 N A.S.M. COMMUNICATION SERVICES 6984 N LEESBURG TEL-COM SERVICES 6744 N AUDREY COX 6987 N BARBADOS TELE-COM 6746 N LEGAL TELCOM SYSTEMS, INC. 6999 R SOUTHAM INC. 6747 N PAUL SIUDZINSKI 7000 N HALICO, INC. 6749 N MADISON TELEMEDIA 7005 N JAMES E. BOGAR 6752 N CG COMMUNICATIONS CORP. 7023 N STANLEY SHAPIRO 6762 N PESCADERO COMMUNICATIONS 7053 N ZASSODA ENTERPRISES 6766 N MARK PAUL BORNSTEIN 7070 N NNT 6767 N PHONE PROGRAMS, INC. 7100 N PARADE PUBLICATIONS 6772 N LEVITHI ASSOCIATES 7101 N PARADE PUBLICATIONS 6774 N ORRIN CHARM 7102 N PARADE PUBLICATIONS 6776 N BELAIR COMMUNICATIONS, INC. 7103 N PARADE PUBLICATIONS 6777 N STATE OF NEVADA 7104 N PARADE PUBLICATIONS 6779 N BURKE TELCOM SERVICES 7125 N PAGEMART, INC. 6783 N HOWARD JONAS 7171 N MARY J. IMHOFF 6784 N EXECUTIVE TELERESEARCH, INC. 7200 N DEREK NESS 6786 N INTERNATIONAL TELEPHONE MAIL 7222 N AUTO VENTURE SVCS., INC. 6789 R WICHITA EAGLE & BEACON PUBLISHING 7223 N PC-TOTES, INC. 6789 R TRI-CITY HERALD 7224 N RGM COMMSTAR 6789 R BUCKS COUNTY COURIER TIMES 7225 N CONDE NAST TRAVELER 6795 N PATTI LOTTERMOSER 7226 N INPUT COMMUNICATIONS 6800 N TODAY'S HOMES 7227 N NEW MEDIA VENTURES, INC. 6824 N NANCY KAHANE 7228 N BEJAY COMMUNICATIONS CORP. 6828 N NANCY M. JONAS 7233 N ABCD, INC. 6833 N JAMES R. WALZ 7234 N BLAISCH PUBLISHING 6834 N GEORGE LOCKWOOD 7236 N AMERICAN INTL. ENTERPRISES 6836 N RICHARD LEVINE 7237 N LORRIE KLINE KAPLAN 6837 N RAFFERTY, INC. 7238 N BUC-VIN TELESERVICES 6844 N JEFF SEAL 7239 N J.B. TELECOM, INC. 6847 N CAROLINE MEGGINSON 7242 N JOEL PACKER 6858 N TELCO PLANNING 7244 N INPUT COMMUNICATIONS 6862 N CORCORAN GROUP, INC. 7245 N TELERAIL SERVICES, INC. 6864 N ANDREW PENN 7246 R NEWS TRIBUNE 6867 N THELMA NELLES 7247 R SEDGEWICK COUNTY INFO. SERVICES 6868 N SCHERERS COMMUNICATIONS 7248 N ANDREW PENN 6872 N NETWORK USA 7249 N LOS ANGELES GARLIC FESTIVAL 6874 N 555 MUSIC, INC. 7255 R PAGE-ALL, INC. 6875 R MUSKEGON CHRONICLE 7256 N ANNE E. CURTIS COMMUNICATIONS 6877 N DEJA LOCKWOOD 7257 N C C RIDERS 6878 N RAMBLEWOOD COMMUNICATIONS 7258 N ARTHUR NAFTALIN 6882 N LEGAL TELCOM SYSTEMS, INC. 7262 N ECLIPSE HOLDINGS, INC. 6883 N LEGAL TELCOM SYSTEMS, INC. 7264 N DENNIS TEMPLE 6886 N OAK CREEK INFORMATION CORP. 7265 N CROSSCONNECT 6887 N LORRIE KLINE KAPLAN 7266 R TIMES OF TRENTON PUBLISHING CORP. 6888 N WM. HARDASH COMMUNICATIONS 7268 N JAMIESON CORPORATION 6889 N THELMA NELLES 7269 N ACCESS INFORMATION NETWORK 6900 R KANSAS CITY STAR 7270 N TIME WARNER TELECOMMUNICATIONS 6910 R TIMES OF TRENTON PUBLISHING CORP. 7272 N NNT 6922 N M.L.C. COMMUNICATIONS 7273 N OAK CREEK INFORMATION CORP. 6924 N M.J.D. COMMUNICATIONS 7274 N ATLANTIC WEST INTERNATIONAL 6927 N M.J.D. COMMUNICATIONS 7275 N SASKTEL 6932 N LORRIE KLINE KAPLAN 7277 N STREET & SMITH'S 6933 N M.J.D. COMMUNICATIONS 7278 N BERNIE SANSHUCK 6934 N T.L. TELE-SERVICES 7282 N PALM BEACH COMMUNICATIONS 6936 N LEESBURG TEL-COM SERVICES 7284 N LEGAL TELCOM SYSTEMS, INC.

TYPE N - NATIONAL, R - REGIONAL 65 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 7286 N LORRIE KLINE KAPLAN 7453 N RISK VENTURE SERVICES, INC. 7287 N TZS CORP. 7454 N RISK VENTURE SERVICES, INC. 7288 N J.B. TELECOM, INC. 7455 N BELINDA S. SIDES 7289 N BOO ENTERPRISES 7456 N PAUL SIUDZINSKI 7292 N BARBADOS TELE-COM 7463 N JAM RESEARCH 7296 R SMR SYSTEMS, INC. 7464 N CONNIE SIMMONS 7297 N JONATHAN FINESTONE 7465 R PINCKNEYVILLE DEMOCRAT 7298 N NAT REESE 7466 N BT TELESIS, INC. 7300 N GARY W. ANDERSON 7468 N JAM RESEARCH 7322 N AMERICAN INTL. ENTERPRISES 7469 N HOOT N HOLLER PUBLICATIONS, INC. 7324 R GREGORY WING 7470 N ANNAPOLIS SAILYARD 7326 N KIRA CORP. 7472 N WAYNE M. HAMMERLY 7327 N JRR RESEARCH, INC. 7473 N TELETEL 7328 N FALCONWOOD CORPORATION 7474 N JARDINE TELE-COM 7329 N PALM BEACH COMMUNICATIONS 7475 N ELLEN GRAY 7332 N STEPHEN SMITH 7483 N ARLINDO DASILVA 7333 N PATTI LOTTERMOSER 7488 N MARKET SHARE, INC. 7334 N ANNE E. CURTIS COMMUNICATIONS 7499 N RAPMIL CORPORATION 7335 R SPARTA NEWS PLAINDEALER 7500 R TIMES-PICAYUNE PUBLISHING CORP. 7336 N DPC TELE-SERVICES 7500 R MODESTO BEE 7337 N HAMMERLY PRODUCTIONS 7502 R WSB, INC. 7338 N WHOLE EARTH GREEN PAGES 7505 N ANNAPOLIS SAILYARD 7342 N GAME SERVICES CORPORATION 7522 N ELLEN GRAY 7344 N ANGEL COMMUNICATIONS CORP. 7526 N SOTIRIOS ASSOC. 7347 N WASHINGTON POST COMPANY 7528 N JAMIESON CORPORATION 7348 N CG COMMUNICATIONS CORP. 7532 N ELLEN GRAY 7352 N HUTCH CO. 7533 N CMR COMPANY 7353 N SELF MAGAZINE 7536 N GRANT JORGENSON 7354 N ANGEL COMMUNICATIONS CORP. 7542 N T.L. TELE-SERVICES 7356 N DDI CORPORATION 7543 N MINDSCAPE 7359 N ANDREW PENN 7544 N C C RIDERS 7362 N ATLANTIC WEST INTERNATIONAL 7545 N ASC 7363 N MODAMAS INC 7547 N LIONESS ASSOCIATES 7364 N BANKCARD MARKETING NETWORK 7548 N ANGEL COMMUNICATIONS CORP. 7366 N GLOBAL TECHNOLOGY CORP. 7555 R LANCASTER NEWSPAPERS, INC. 7367 N CG COMMUNICATIONS CORP. 7563 N CITY VENTURES 7369 N ARTHUR NAFTALIN 7565 N BERNIE SANSHUCK 7372 N AMERICAN PROTOCALL 7568 N MF INDUSTRIES 7373 N UNASOURCE MARKETING GROUP 7569 N KAREN LOCKWOOD 7374 N CAC TELECOMM, INC. 7575 R NB TEL 7375 N ROBERT N. MARKHAM 7575 R NEWFOUNDLAND TEL 7376 N M&C MINNESOTA, INC. 7575 R AGT LIMITED 7377 N SOFT PRODUCTS, INC. 7575 R SASKTEL 7378 R JAMES R. WALZ 7575 R BC TEL 7378 R US WEST COMMUNICATIONS 7575 R BELL CANADA 7378 R CAHOKIA-DUPO HERALD 7575 R MT&T 7379 R PINCKNEYVILLE DEMOCRAT 7575 R MTS 7381 N BICOM 7586 N INTERNATIONAL TELEPHONE MAIL 7382 N BELAIR COMMUNICATIONS, INC. 7588 N EXOTIC SERVICES, INC. 7383 N BRENDAN CORP. 7591 N PAUL SIMONS 7384 N AMERICAN PROTOCALL 7594 N CITY VENTURES 7385 N R.P.W. COMMUNICATIONS 7597 N AURAND 7386 N SAN DIEGO TELE-SERVICES 7598 N CITY VENTURES 7387 R JAMES R. WALZ 7600 N QUATERRA COMMUNICATIONS CORP. 7387 R TEXAS MEDICAL PAGING 7609 N BF&L 7388 R COWLES PUBLISHING CO. 7622 N VIRGINIA BEACH COMMUNICATIONS CORP. 7389 R COWLES PUBLISHING CO. 7623 N SHARE A RIDE INTERNATIONAL, INC. 7391 N NETWORK TELEPHONE SERVICES, INC. 7626 N CONDE NAST TRAVELER 7392 N LUBBOCK COMMUNICATIONS SVCS. 7628 N ARTHUR NAFTALIN 7394 N AMERICAN INTL. ENTERPRISES 7632 N ENGULF & DEVOUR 7395 N G-R TELCOM SERVICES, INC. 7633 N D.G. TELECOM SERVICES 7399 N WEPS, INC. 7638 N NEUROLOGY CLINIC, P.C. 7400 N PAUL SIMONS 7639 R WABC-TV 7403 N KPT MANAGEMENT CORP. 7645 N CHRISTOPHER HALE 7406 N JOANN T. SHAPIRO 7646 N STANLEY H. KAPLAN EDUCATION CTR. 7423 N ROB-TEL SERVICES 7647 N MATHEWS AERIAL SERVICES, INC. 7424 N BH INFORMATION CORP. 7652 N D.G. TELECOM SERVICES 7426 R SEDGEWICK COUNTY INFO. SERVICES 7653 N MIDDLEWAVE TELECOM CORP 7427 N TOP LINE RESOURCES 7654 N SNOWMASS COMMUNICATIONS 7428 N PALM BEACH COMMUNICATIONS 7655 R KABC RADIO, INC. 7432 N ELLEN GRAY 7655 R REMINDER NEWSPAPERS 7433 N SHARE A RIDE INTERNATIONAL, INC. 7656 N ORRIN CHARM 7434 N D.G. TELECOM SERVICES 7658 N JAMES MARLIN 7435 N IJKL, INC. 7659 N NORSICAN COMMUNICATIONS, INC. 7437 N YGBK CORPORATION 7662 N CONNIE SIMMONS 7442 N ARTHUR NAFTALIN 7663 N TERRIAN CORP. 7444 N WHOLE EARTH GREEN PAGES 7664 N 555-SONG, INC. 7445 N JRR RESEARCH, INC. 7665 N SHARE A RIDE INTERNATIONAL, INC. 7446 N CREATIVE DIRECT MARKETING 7666 N PAN & ASSOCIATES

TYPE N - NATIONAL, R - REGIONAL 66 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 7672 N JARDINE TELE-COM 7867 N STREET & SMITH'S 7673 N STONEBRAKER & WILSON, INC. 7868 N ANNE E. CURTIS COMMUNICATIONS 7674 N LEVINSOHN GROUP, II, INC. 7872 N YACHT FUND COMMUNICATIONS 7675 N A & H ENTERPRISES 7873 N CLARKE TRANSPORT CANADA 7676 R MURIETA TIMES 7874 N READY CALL, INC. 7677 N CMR COMPANY 7876 N NEUROLOGY CLINIC, P.C. 7678 N WASHINGTON POST COMPANY 7877 N PHONE USA INC. 7679 N MELISSA NOLIN 7878 N WESLEY MEDICAL CENTER 7683 N CAC TELECOMM, INC. 7883 N CRAIG P. LEVINSOHN 7685 N KLM & R COMMUNICATIONS 7887 N NANCY KAHANE 7687 N ABC ENTERPRISES 7888 N NEED COMMUNICATIONS, INC. 7688 N BERNIE SANSHUCK 7890 N MID ATLANTIC TELECOM 7692 N G & W COMMUNICATIONS 7895 N GQ MAGAZINE 7693 N MOBIUS RESEARCH 7898 R STAR-TELEGRAM OPERATING, LTD. 7695 N ELLEN GRAY 7924 N GRANT JORGENSON 7696 R WABC-TV 7926 N NETWORK BILLING SYSTEMS, LLC 7700 N LEXICOM, INC. 7928 R SOUTHWESTERN BELL-ST. LOUIS 7711 N BOYD BYERS 7929 N GEORGE LOCKWOOD 7722 N BEJAY COMMUNICATIONS CORP. 7932 N JOYCE S. MARKHAM 7724 N NAT REESE 7933 N KIRA CORP. 7726 N BEJAY COMMUNICATIONS CORP. 7936 N PDQ PHONE, INC. 7727 N KATHLEEN S. ANDERSON 7946 N JAMIESON CORPORATION 7729 N LISA TENNEY 7947 N ANNE E. CURTIS COMMUNICATIONS 7732 N LEVITHI ASSOCIATES 7956 N ZOOM VIDEO PRODUCTIONS 7733 N DONNA BROWN 7957 N SUSAN M. STONE 7734 N ANGEL COMMUNICATIONS CORP. 7972 N CAROLYN CHAMBERLAIN 7735 N CROW INT'L. 7979 N MARY J. IMHOFF 7736 N MCDONALD COMMUNICATION SERVICES 8000 R TELE-DIRECT PUBLICATIONS 7737 N STANLEY H. KAPLAN EDUCATION CTR. 8000 R WICHITA EAGLE & BEACON PUBLISHING 7738 N VISUAL RADIO 8002 N INKICOMM, INC. 7742 N SHARON WEISS 8003 N ASPEN COMMUNICATIONS CORP. 7743 N BELINDA S. SIDES 8004 N ASPEN COMMUNICATIONS CORP. 7744 N JOY BOYD 8005 N ASPEN COMMUNICATIONS CORP. 7745 N T.L. TELE-SERVICES 8006 N ASPEN COMMUNICATIONS CORP. 7746 N MUSIC LINE 8007 N C&C FINANCIAL & COMMUNICATIONS 7747 N MARKET POWER, INC. 8008 N C&C FINANCIAL & COMMUNICATIONS 7754 N CHAMBERLAIN COMMUNICATIONS 8080 N RCI LONG DISTANCE, INC. 7755 N BUSINESS TO CONSUMER NETWORK 8083 N CSR ASSOCIATES 7756 N CHAMBERLAIN COMMUNICATIONS 8087 N HANNAH SHAPIRO 7761 N DEREK NESS 8090 N HEALTH VENTURE SVCS., INC. 7762 N DENNIS TEMPLE 8096 N HANNAH SHAPIRO 7763 N CSR ASSOCIATES 8097 N JAMES E. BOGAR 7764 R O'FALLON PROGRESS 8100 R KGO-ABC/CAPITAL CITIES 7765 N ANGEL COMMUNICATIONS CORP. 8146 N A. JACOB ARTHUR ASSOC. 7766 N ICS HOLDINGS COMPANY 8181 R OAKLAND PRESS 7768 R PINCKNEYVILLE DEMOCRAT 8189 N RICHARD A. STONE 7770 R MULTICOM, DIV. OF DE GROUPE QUEBECOR INC. 8200 N TODAY'S HOMES 7774 N COMMUNICATIONS VENTURE SVCS., INC. 8222 N T & J INFORMATION 7778 N DEAN R. CHAMBERLAIN 8225 N JA ASSOCIATES 7782 N K.M. COMMUNICATION SERVICES 8226 N TOP LINE RESOURCES 7783 N K.M. COMMUNICATION SERVICES 8228 N G.R.F. COMMUNICATION SERVICES 7787 N NATIONWIDE WIRELESS NETWORK 8229 N TUNA CORP. 7788 N REVENUE CANADA 8238 N DW FITNESS 7792 N M&C MINNESOTA, INC. 8243 N AUCTION VISION INT'L US, INC. 7799 N WARREN JASON 8245 R FONES WEST 7800 N SCHERERS COMMUNICATIONS 8246 N OCEAN ATLANTIC FINANCIAL INVESTMENT 7814 N SUMMIT COMMUNICATIONS 8247 N RAMBLEWOOD COMMUNICATIONS 7822 N J.B. TELECOM, INC. 8249 N BURKE TELCOM SERVICES 7823 N PENTA RESOURCES CORP. 8252 N YGBK CORPORATION 7824 N RITA DUSSEAU 8253 N MARKET SHARE, INC. 7825 N NETWORK TELEPHONE SERVICES, INC. 8256 R NEVADA BELL 7826 N MCDONALD COMMUNICATION SERVICES 8257 N BROOKS TELE-COM SERVICES 7828 N JILL CARTER CONSULTING 8259 N EXCELL AGENT SERVICES 7829 N FLAMELESS HEAT, INC. 8262 N CRYSTAL MARCUS AUGUST 7832 N OCEAN ATLANTIC FINANCIAL INVESTMENT 8265 N PESCADERO COMMUNICATIONS 7833 N WAYNE M. HAMMERLY 8267 N J & T TELECOM CORP. 7837 N RANDOM ACCESS CORP. 8269 N ECCO, INC. 7838 N EXECUTIVE TELERESEARCH, INC. 8273 N DEREK NESS 7839 R STAR-TELEGRAM OPERATING, LTD. 8274 N PALM BEACH COMMUNICATIONS 7845 R PINCKNEYVILLE DEMOCRAT 8275 N ROBERT G. DREHER 7847 N RWH INFORMATION CORP. 8276 N JOY ENTERPRISES, INC. 7848 N SNOMIS CORP. 8277 N THELMA NELLES 7854 N SANDRA SPANG 8283 N INTERACTIVE VIDEO ENTERPRISES 7858 N SANDRA SPANG 8284 N J&S COMMUNICATIONS SVCS. 7862 N SAM HAIM 8291 N SUMMERHILL VENTURES, INC. 7863 N POTOMAC TELESERVICES 8292 N TAS ENTERPRISES 7864 N OCEAN ATLANTIC FINANCIAL INVESTMENT 8293 N LISA TENNEY 7865 R LANCASTER NEWSPAPERS, INC. 8294 N TELETAXI SERVICES INC. 7866 N FINANCIAL TELESYS CORP. 8295 N WILTEL

TYPE N - NATIONAL, R - REGIONAL 67 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 8296 N WILTEL 8568 N ROBERT G. DREHER 8297 N WILTEL 8584 N FALSTAFF TELE-COM 8299 N SOTIRIOS ASSOC. 8585 N GANNETT CO., INC. 8300 N ONCOR COMMUNICATIONS, INC. 8587 N PHON-E 8322 N YACHT FUND COMMUNICATIONS 8600 N TELEMATION INTERNATIONAL 8325 N BELINDA S. SIDES 8622 R NEVADA BELL 8326 N EFGH, INC. 8623 N EXECUTIVE TELERESEARCH, INC. 8327 N ROBERT G. DREHER 8627 N MELISSA NOLIN 8333 R ISLAND PACKET 8632 N RAK COMMUNICATIONS, INC. 8336 N THOMAS J. HUGHES, III 8636 N POTOMAC TELESERVICES 8337 N CRYSTAL MARCUS AUGUST 8637 R MURIETA TIMES 8338 N INKICOMM, INC. 8642 N VOICES FROM HOME, INC. 8342 N ZASSODA ENTERPRISES 8643 N VIRGINIA BEACH COMMUNICATIONS CORP. 8343 N FRANCES H. NAFTALIN 8646 N GOURMET MAGAZINE 8345 N JONATHAN FINESTONE 8648 N AIRWAYS CORPORATION 8346 N MANLEY COMMUNICATION SERVICES 8649 N MG COMMUNICATIONS, INC. 8352 N TARGET REALTY 8652 N BLUE AMBER MOTEL, INC. 8353 N CROSSCONNECT 8653 N C&C FINANCIAL & COMMUNICATIONS 8355 R COUNTY PRESS 8655 N MG COMMUNICATIONS, INC. 8355 R MARISSA JOURNAL 8656 N CG COMMUNICATIONS CORP. 8358 N JOEL PACKER 8657 N ROBERT G. DREHER 8361 N ARLINDO DASILVA 8658 N BICOM 8363 N YACHT FUND COMMUNICATIONS 8661 N NEWSPAPER NETWORK 8366 N MARKET SHARE, INC. 8663 N WARREN JASON 8368 N JARDINE TELE-COM 8664 N JESSICA JONAS 8372 N BROOKS TELE-COM SERVICES 8665 N NOR CORP. 8376 N JFC TELECOMM, INC. 8667 N UNASOURCE MARKETING GROUP 8378 N STANLEY H. KAPLAN EDUCATION CTR. 8668 N KENSINGTON PHYSICAL THERAPY 8383 N VANITY FAIR 8672 N CCB TELEPHONY, INC. 8386 N AGR ASSOCIATES 8673 N MG COMMUNICATIONS, INC. 8387 N JILL CARTER CONSULTING 8674 N POTOMAC TELESERVICES 8388 N MCDONALD COMMUNICATION SERVICES 8675 N INPUT COMMUNICATIONS 8389 N SUSAN M. STONE 8676 N CHAMBERLAIN COMMUNICATIONS 8392 N CONNIE SIMMONS 8677 N DONNA BROWN 8398 N RANDOM HOUSE 8678 N CROW INT'L. 8400 N TELEMATION INTERNATIONAL 8682 N FRANCES H. NAFTALIN 8423 N FALCONWOOD CORPORATION 8683 N CAPITAL NETWORK SYSTEM, INC. 8424 N ASC 8686 N T.L. TELE-SERVICES 8425 N FALCONWOOD CORPORATION 8688 N CAPITAL NETWORK SYSTEM, INC. 8426 N JILL CARTER CONSULTING 8690 N HANNAH SHAPIRO 8427 N LIFE ZONE SERVICES 8692 N INKICOMM, INC. 8428 N DEBBIE A. COSPER 8693 N BTD ENTERPRISES 8432 N LANSDALE COMMUNICATIONS 8695 N ROCK-TEL COMMUNICATIONS 8433 N BELL CANADA 8696 R MORGAN HILL TIMES 8435 N BEJAY COMMUNICATIONS CORP. 8697 N GAME SERVICES CORPORATION 8436 N CCB TELEPHONY, INC. 8698 N MG COMMUNICATIONS, INC. 8437 N EDNA L. MCKINLEY 8700 R QUALICOM 8438 N CORCORAN GROUP, INC. 8705 N ARCHITECTURAL DIGEST 8439 N VOGUE 8720 N AMERITECH COMMUNICATIONS 8442 N ARLINDO DASILVA 8721 N HALICO, INC. 8443 N LISA TENNEY 8722 N THOMAS J. HUGHES, III 8446 N SARAH O. MONTGOMERY 8723 N MICHAEL B. MAW 8447 N INTERACTIVE DEVICES 8724 N AIRLINE VENTURE SVCS., INC. 8453 N TERRIAN CORP. 8725 N VOICE INFO, SVCS., INC. 8458 N ASC 8726 N TELCO PLANNING 8459 N AYSM CORP. 8727 N WEDDINGFONE, INC. 8462 N NETWORK TELEPHONE SERVICES, INC. 8728 N BRIDE'S MAGAZINE 8466 N RAK COMMUNICATIONS, INC. 8729 N NANCY KAHANE 8468 N CCB TELEPHONY, INC. 8732 N AMERICAN INTL. ENTERPRISES 8469 N MELISSA NOLIN 8733 N CHRISTOPHER HALE 8473 N AUTO VENTURE SVCS., INC. 8734 N CAROLYN CHAMBERLAIN 8474 N JRR RESEARCH, INC. 8735 N PRODUCT VENTURE SERVICES, INC. 8475 N J.B. TELECOM, INC. 8736 N POTOMAC TELESERVICES 8478 N YACHT FUND COMMUNICATIONS 8737 N SKYTEL CORPORATION 8482 R DISPATCH 8743 R WJR -DIV. OF CAPITAL CITIES/ABC, INC. 8484 N MARY J. IMHOFF 8744 R WJR -DIV. OF CAPITAL CITIES/ABC, INC. 8486 N ROCK-TEL COMMUNICATIONS 8745 R WJR -DIV. OF CAPITAL CITIES/ABC, INC. 8487 N PHONE USA INC. 8746 N JAMIESON CORPORATION 8488 N JEFF SPANG 8748 N MIDDLEWAVE TELECOM CORP 8491 N MELISSA NOLIN 8749 N FRANCES H. NAFTALIN 8497 N BELINDA S. SIDES 8754 N JONATHAN FINESTONE 8499 N MOVIEFONE, INC. 8756 N CECELIA DOWNS 8500 R COWLES MEDIA COMPANY 8762 N LISA TENNEY 8505 N SANDRA SPANG 8765 N MG COMMUNICATIONS, INC. 8523 N D.G. TELECOM SERVICES 8767 N ACCESS INFO-NET, INC. 8542 N TOUCH PHONE PRODUCTIONS, INC. 8768 N INPUT COMMUNICATIONS 8547 N MELISSA NOLIN 8769 N YGBK CORPORATION 8555 R LANCASTER NEWSPAPERS, INC. 8772 N CURTIS WORLDWIDE ENTERPRISES, INC. 8555 R JOSEPH BASIL MILLER 8775 N POTOMAC TELESERVICES

TYPE N - NATIONAL, R - REGIONAL 68 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 8777 N BUDDY HOWE 9273 N DIVAD TELECOM 8782 N HUTCH CO. 9274 N 900 VOICE, INC. 8783 N C C RIDERS 9276 R WWRM, INC. 8784 N ALTIMONT COMMUNICATIONS 9277 N BT TELESIS, INC. 8785 N SUMMIT COMMUNICATIONS 9278 N B & C ENTERPRISES 8786 N ACCESS INFORMATION NETWORK 9282 N ELLEN SILVERBERG 8787 N C&C FINANCIAL & COMMUNICATIONS 9283 N JILL CARTER CONSULTING 8789 N JOY ENTERPRISES, INC. 9284 N EUROPEAN AMERICAN TRAVEL, INC. 8790 N CORPORATE TELEMANAGEMENT GROUP 9287 N DPC TELE-SERVICES 8791 N 555 ON-LINE 9292 R KQRS, INC. 8792 R US WEST NEW VECTOR GROUP 9297 N HOWARD JONAS 8792 N DAVID L. SIMONS 9300 N TELECOMPUTE CORPORATION 8794 N RAK COMMUNICATIONS, INC. 9320 N MANHATTAN ENTERPRISES 8797 N RAK COMMUNICATIONS, INC. 9321 N TAS ENTERPRISES 8800 N LEXICOM, INC. 9322 N JA ASSOCIATES 8812 R POST-NEWSWEEK STAT. - SAN ANTONIO 9323 N MANHATTAN ENTERPRISES 8822 N DONNA BROWN 9324 N MANHATTAN ENTERPRISES 8824 N BELAIR COMMUNICATIONS, INC. 9325 N MANHATTAN ENTERPRISES 8833 N BOYD BYERS 9326 N BANKCARD MARKETING NETWORK 8838 N CRYSTAL MARCUS AUGUST 9327 N VOGUE 8844 N JOY BOYD 9328 N BILLY M. COSPER, JR. 8845 N BURKE TELCOM SERVICES 9329 N MANHATTAN ENTERPRISES 8846 N BROOKS TELE-COM SERVICES 9330 N QUATERRA COMMUNICATIONS CORP. 8848 N INKICOMM, INC. 9331 N WEDDINGFONE, INC. 8854 N TAS ENTERPRISES 9333 N INTERNATIONAL TELEPHONE MAIL 8855 N BUSINESS TO CONSUMER NETWORK 9334 N GAW TELECOM RESOURCES 8858 N FALCONWOOD CORPORATION 9335 N NEWSWEEK 8860 N SUMMERHILL ENTERPRISES 9336 N JOEL PACKER 8861 N SUMMERHILL ENTERPRISES 9337 N BRIDE'S MAGAZINE 8862 N SUMMERHILL ENTERPRISES 9342 N BEDFORDSHIRE COMMUNICATIONS 8863 N VOICES FROM HOME, INC. 9344 N CRYSTAL MARCUS AUGUST 8863 N PCM, INC. 9345 N YACHT FUND COMMUNICATIONS 8864 N TAS INDUSTRIES 9348 R POST-NEWSWEEK STATIONS, MICHIGAN 8865 N TAS INDUSTRIES 9352 R WIOD, INC. 8866 N DENNY BROWN 9353 R BALTIMORE SUN COMPANY 8867 N SUMMERHILL ENTERPRISES 9355 R DISPATCH 8868 N SUMMERHILL ENTERPRISES 9355 R KATHLEEN S. ANDERSON 8872 N JFR NUMBER SYSTEMS 9359 N US WEST MARKETING RESOURCES 8873 N NETWORK BILLING SYSTEMS, LLC 9370 N KENSINGTON PHYSICAL THERAPY 8876 N DENNIS TEMPLE 9372 R POST-NEWSWEEK STATIONS-CT., INC. 8877 N DAVID W. GOODALE 9373 N INKICOMM, INC. 8885 N FALCONWOOD CORPORATION 9376 N NORTHWEST FARMER-STOCKMAN, INC. 8893 N JFR NUMBER SYSTEMS 9378 N BERNIE SANSHUCK 8899 N DAVID W. GOODALE 9382 N W-O TELCOM SERVICES, INC. 8900 N RCI LONG DISTANCE, INC. 9383 N W-O TELCOM SERVICES, INC. 8911 N CROW INT'L. 9384 N W-O TELCOM SERVICES, INC. 8926 N FRANCES H. NAFTALIN 9385 N W-O TELCOM SERVICES, INC. 8928 N INTER ACTIVE TELECOM 9386 N W-O TELCOM SERVICES, INC. 8946 N SIDNEY LEVINSOHN 9387 N G-R TELCOM SERVICES, INC. 8953 N VALERIE ERVIN 9388 R WFTV, INC. 8975 N PTI COMMUNICATIONS 9389 N G-R TELCOM SERVICES, INC. 8980 R TIME WARNER TELECOMMUNICATIONS 9393 R KQRS, INC. 8987 N PAUL LOCKWOOD 9419 N PAUL LOCKWOOD 8989 N MARY J. IMHOFF 9428 R WATERLOO REPUBLIC-TIMES 8999 N US WEST MARKETING RESOURCES 9433 N ENCORE AGENCY 9000 N FTD DIRECT ACCESS, INC. 9436 R NEW ATHENS JOURNAL 9004 N SAN DIEGO TELE-SERVICES 9437 N KAMARIS ASSOCIATES 9006 N PAUL LOCKWOOD 9446 R WHIO, INC. 9075 N KPT MANAGEMENT CORP. 9447 N 800 CONCEPTS LLC 9090 N NNT 9448 N MCDONALD COMMUNICATION SERVICES 9111 R C.H. EPPERT 9453 N NETWORK TELEPHONE SERVICES, INC. 9191 R C.H. EPPERT 9455 N ALLEN EISDORFER ESQ. 9222 R WABC-TV 9461 N SUMMERHILL VENTURES, INC. 9224 N GAW TELECOM RESOURCES 9462 N SGR NETWORK SERVICES 9225 N EILEEN LOCKWOOD 9463 N GOURMET MAGAZINE 9233 N CHRISTINE MARLIN 9464 N G & W COMMUNICATIONS 9244 R MERCURY NEW MEDIA 9465 N DAVID H. LOCKWOOD 9248 R PACIFIC BELL-NATL. ACCOUNTS 9466 R EARLYBIRD AWARDS, INC. 9253 N TELEWAKE SERVICES, INC. 9467 N TELECOM TECHNOLOGIES 9254 R WCKG, INC. 9468 N VALERIE ERVIN 9255 N ARCHITECTURAL DIGEST 9472 R NEW-CELL, INC. 9256 N ACCESS INFO-NET, INC. 9473 N KAMARIS ASSOCIATES 9258 N TUNA CORP. 9474 N BF&L 9262 N MARYLAND TEL-COM SERVICES 9475 N SUSAN DELETTERA 9263 R WWRM, INC. 9483 N INTERNATIONAL TELESIS, INC. 9264 N BROOKS TELE-COM SERVICES 9484 N VALERIE ERVIN 9265 N WAYNE M. HAMMERLY 9486 N GAW TELECOM RESOURCES 9266 N TAKEOUT TAXI HOLDINGS, INC. 9487 N EILEEN LOCKWOOD 9268 R SPARTA NEWS PLAINDEALER 9494 N MARY J. IMHOFF

TYPE N - NATIONAL, R - REGIONAL 69 TABLE 12 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY LINE NUMBER (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO 9500 R MODESTO BEE 9550 N BUDGET CALL LONG DISTANCE 9555 N DDI CORPORATION 9559 R GAZETTE NEWSPAPERS 9566 R WATERLOO REPUBLIC-TIMES 9587 N WORD OF MOUTH ADVERTISING 9595 N GANNETT CO., INC. 9597 N WAYNE M. HAMMERLY 9598 R POST-NEWSWEEK STAT. - FLORIDA, INC. 9622 R NEVADA BELL 9623 N NAT REESE 9627 N CONNIE SIMMONS 9636 N BTD ENTERPRISES 9638 N WILTEL 9639 N SAN DIEGO TELE-SERVICES 9642 N SUSAN DELETTERA 9644 N VALERIE ERVIN 9653 N BEDFORDSHIRE COMMUNICATIONS 9662 N ENCORE AGENCY 9663 R NEW-CELL, INC. 9665 N PAUL SIUDZINSKI 9668 N JAM RESEARCH 9677 N JOYCE S. MARKHAM 9686 N MARK PAUL BORNSTEIN 9687 N ROZAR ASSOCIATES 9688 N B.H. COMMUNICATION SERVICE 9696 R WHYT-FM 9722 R WSB, INC. 9723 R WSB, INC. 9727 R NYNEX-NEW YORK 9732 N CRYSTAL MARCUS AUGUST 9736 N SUSAN DELETTERA 9737 N BURKE TELCOM SERVICES 9747 N TELE-DIRECT PUBLICATIONS 9748 N VALERIE ERVIN 9754 R POST-NEWSWEEK STAT. - FLORIDA, INC. 9754 R ERNEST J. ANDERSON, JR. 9762 R ERNEST J. ANDERSON, JR. 9762 R WSOC TELEVISION, INC. 9766 N SUSAN DELETTERA 9769 R ERNEST J. ANDERSON, JR. 9769 R RICHARD S. BELL 9773 N SUSAN DELETTERA 9786 R WWRM, INC. 9786 R ERNEST J. ANDERSON, JR. 9794 R ERNEST J. ANDERSON, JR. 9794 R WPXI, INC. 9797 N STANLEY SHAPIRO 9800 R TELECOMPUTE CORPORATION 9805 N ARCHITECTURAL DIGEST 9853 N FRANCES H. NAFTALIN 9866 N BARBADOS TELE-COM 9872 N NEW MEDIA VENTURES, INC. 9876 N RCI LONG DISTANCE, INC. 9877 N THELMA NELLES 9883 R WTVD/CHANNEL 11 9898 N AGT LIMITED 9900 N LEXICOM, INC. 9911 N BOYD BYERS 9918 R NEWSWEEKLY 9919 R BRITE VOICE SYSTEMS 9922 N DAVID W. GOODALE 9933 N DAVID W. GOODALE 9955 N DDI CORPORATION 9966 N BOYD BYERS 9977 N DENNY BROWN 9979 R WCKG, INC. 9980 R AMERITECH PAYPHONE SERVICES 9985 R BELL ATLANTIC 9988 N DENNY BROWN 9990 N PDQ PHONE, INC. 9991 N PILGRIM TELEPHONE, INC. 9992 N PILGRIM TELEPHONE, INC. 9993 N PILGRIM TELEPHONE, INC. 9994 N PILGRIM TELEPHONE, INC. 9995 N PILGRIM TELEPHONE, INC. 9996 N PDQ PHONE, INC. 9997 N PDQ PHONE, INC. 9998 N PDQ PHONE, INC.

TYPE N - NATIONAL, R - REGIONAL 70 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 5080 N 2PM GROUP LTD. 3483 N ACTIVITY DIRECTORIES INTL., INC. 4876 N 2PM GROUP LTD. 5674 N ADAM/CHARLES TEXTILES 3569 N 555 FLOWERS, INC. 2010 N ADAM/CHARLES TEXTILES 6374 N 555 INFO NET 4261 N ADAM/CHARLES TEXTILES 4226 N 555 INFO NET 2833 N ADAM/CHARLES TEXTILES 4647 N 555 INFO NET 0421 N ADAM/CHARLES TEXTILES 2282 N 555 INFO NET 1234 R ADVANCED PURE WATER CORP. 6874 N 555 MUSIC, INC. 5005 R ADVANCED PURE WATER CORP. 2776 N 555 ON-LINE 0005 R ADVANCED PURE WATER CORP. 8791 N 555 ON-LINE 0500 R ADVANCED PURE WATER CORP. 0511 N 555 ON-LINE 5526 N ADVANTIS 3291 N 555-FAX-IT 2426 N ADVANTIS 3292 N 555-FAX-IT 2884 N ADVANTIS 0411 N 555-FAX-IT 2378 N AERIE GROUP 3294 N 555-FAX-IT 4698 N AGR ASSOCIATES 3366 N 555-FAX-IT 8386 N AGR ASSOCIATES 7664 N 555-SONG, INC. 4975 N AGR ASSOCIATES 6336 N 800 CONCEPTS LLC 5644 N AGR ASSOCIATES 3263 N 800 CONCEPTS LLC 9898 N AGT LIMITED 2224 N 800 CONCEPTS LLC 1313 R AGT LIMITED 5223 N 800 CONCEPTS LLC 7575 R AGT LIMITED 9447 N 800 CONCEPTS LLC 1198 N AGT LIMITED 9274 N 900 VOICE, INC. 4688 N AIKATERINI ASSOC. 4567 N 900 VOICE, INC. 4657 N AIKATERINI ASSOC. 3733 R 900 VOICE, INC. 4637 N AIKATERINI ASSOC. 2887 N 900 VOICE, INC. 4673 N AIKATERINI ASSOC. 2676 N 900 VOICE, INC. 1213 R AIR ONE, INC. 6248 N A & H ENTERPRISES 1242 N AIR ONE, INC. 5723 N A & H ENTERPRISES 1000 R AIR ONE, INC. 7675 N A & H ENTERPRISES 1215 N AIR ONE, INC. 6284 N A & H ENTERPRISES 4212 N AIR ONE, INC. 6585 N ABC DAYTIME CIRCLE, INC. 3358 N AIRLINE VENTURE SVCS., INC. 4677 N ABC DAYTIME CIRCLE, INC. 8724 N AIRLINE VENTURE SVCS., INC. 2445 N ABC DAYTIME CIRCLE, INC. 2359 N AIRLINE VENTURE SVCS., INC. 7687 N ABC ENTERPRISES 4892 N AIRWAYS CORPORATION 4523 N ABC ENTERPRISES 8648 N AIRWAYS CORPORATION 3532 N ABC ENTERPRISES 4482 N AIRWAYS CORPORATION 3728 N ABC ENTERPRISES 3872 N AIRWAYS CORPORATION 3686 N ABC ENTERPRISES 5722 N ALADDIN 2221 N ABC RADIO NETWORKS, INC. 5678 N ALADDIN 4458 N ABCD, INC. 5369 N ALADDIN 4928 N ABCD, INC. 5747 N ALADDIN 2834 N ABCD, INC. 5462 N ALADDIN 2526 N ABCD, INC. 3597 N ALL AMERICAN TELEPHONE CO. 7233 N ABCD, INC. 4999 N ALL AMERICAN TELEPHONE CO. 3923 N ABRAM I. SACHS 4569 N ALL AMERICAN TELEPHONE CO. 3926 N ABRAM I. SACHS 2275 N ALL AMERICAN TELEPHONE CO. 3767 N ABRAM I. SACHS 2232 N ALL AMERICAN TELEPHONE CO. 3889 N ABRAM I. SACHS 9455 N ALLEN EISDORFER ESQ. 3878 N ABRAM I. SACHS 3223 N ALLURE MAGAZINE 6655 R ACC CORP. 2558 N ALLURE MAGAZINE 4835 N ACCESS INFO-NET, INC. 2295 N ALTIMONT COMMUNICATIONS 6552 N ACCESS INFO-NET, INC. 8784 N ALTIMONT COMMUNICATIONS 8767 N ACCESS INFO-NET, INC. 2838 N ALTIMONT COMMUNICATIONS 6229 N ACCESS INFO-NET, INC. 2627 N ALTIMONT COMMUNICATIONS 9256 N ACCESS INFO-NET, INC. 4356 N ALTIMONT COMMUNICATIONS 4993 N ACCESS INFORMATION NETWORK 7322 N AMERICAN INTL. ENTERPRISES 8786 N ACCESS INFORMATION NETWORK 7394 N AMERICAN INTL. ENTERPRISES 4377 N ACCESS INFORMATION NETWORK 8732 N AMERICAN INTL. ENTERPRISES 7269 N ACCESS INFORMATION NETWORK 6534 N AMERICAN INTL. ENTERPRISES 3664 N ACCESS INFORMATION NETWORK 7236 N AMERICAN INTL. ENTERPRISES 4736 N ACCESS UNLIMITED USA 2721 N AMERICAN PCS, L.P. (DBA APC) 4725 N ACCESS UNLIMITED USA 7384 N AMERICAN PROTOCALL 4278 N ACCESS UNLIMITED USA 7372 N AMERICAN PROTOCALL 4466 N ACCESS UNLIMITED USA 1234 R AMERITECH 5550 N ACCESS UNLIMITED USA 5252 R AMERITECH ADVERTISING SERVICES 4678 N ACP CORP. 1225 N AMERITECH COMMUNICATIONS 4754 N ACTIVITY DIRECTORIES INTL., INC. 0872 N AMERITECH COMMUNICATIONS 2453 N ACTIVITY DIRECTORIES INTL., INC. 8720 N AMERITECH COMMUNICATIONS

TYPE N - NATIONAL, R - REGIONAL 71 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 1872 N AMERITECH COMMUNICATIONS 7597 N AURAND 5858 N AMERITECH COMMUNICATIONS 3854 N AURAND 5151 R AMERITECH INFO. INDUSTRY SVCS. 2538 N AURAND 9980 R AMERITECH PAYPHONE SERVICES 8473 N AUTO VENTURE SVCS., INC. 1500 R ANCHORAGE DAILY NEWS 7222 N AUTO VENTURE SVCS., INC. 4200 R ANCHORAGE DAILY NEWS 8459 N AYSM CORP. 6344 N ANDREW PENN 2322 N AYSM CORP. 7359 N ANDREW PENN 5248 N AYSM CORP. 7248 N ANDREW PENN 2677 N AYSM CORP. 3436 N ANDREW PENN 4639 N A. JACOB ARTHUR ASSOC. 6864 N ANDREW PENN 8146 N A. JACOB ARTHUR ASSOC. 7344 N ANGEL COMMUNICATIONS CORP. 2636 N A. JACOB ARTHUR ASSOC. 7734 N ANGEL COMMUNICATIONS CORP. 2438 N A. JACOB ARTHUR ASSOC. 7354 N ANGEL COMMUNICATIONS CORP. 6455 N A. JACOB ARTHUR ASSOC. 7765 N ANGEL COMMUNICATIONS CORP. 3792 N A.S.M. COMMUNICATION SERVICES 7548 N ANGEL COMMUNICATIONS CORP. 4388 N A.S.M. COMMUNICATION SERVICES 7505 N ANNAPOLIS SAILYARD 2645 N A.S.M. COMMUNICATION SERVICES 7470 N ANNAPOLIS SAILYARD 4324 N A.S.M. COMMUNICATION SERVICES 6350 N ANNAPOLIS SAILYARD 6742 N A.S.M. COMMUNICATION SERVICES 6940 N ANNAPOLIS SAILYARD 2825 N B & A ENTERPRISES 6637 N ANNAPOLIS SAILYARD 2284 N B & A ENTERPRISES 3739 N ANNE E. CURTIS COMMUNICATIONS 4787 N B & A ENTERPRISES 7334 N ANNE E. CURTIS COMMUNICATIONS 6246 N B & A ENTERPRISES 7947 N ANNE E. CURTIS COMMUNICATIONS 9278 N B & C ENTERPRISES 7256 N ANNE E. CURTIS COMMUNICATIONS 6285 N B & C ENTERPRISES 7868 N ANNE E. CURTIS COMMUNICATIONS 4625 N B & C ENTERPRISES 9255 N ARCHITECTURAL DIGEST 4723 N B & C ENTERPRISES 9805 N ARCHITECTURAL DIGEST 0005 R BALTIMORE SUN COMPANY 8705 N ARCHITECTURAL DIGEST 0004 R BALTIMORE SUN COMPANY 2724 N ARCHITECTURAL DIGEST 9353 R BALTIMORE SUN COMPANY 8361 N ARLINDO DASILVA 0002 R BALTIMORE SUN COMPANY 5276 N ARLINDO DASILVA 0003 R BALTIMORE SUN COMPANY 8442 N ARLINDO DASILVA 2685 N BANK OF MONTREAL 7483 N ARLINDO DASILVA 6294 N BANK OF MONTREAL 7369 N ARTHUR NAFTALIN 9326 N BANKCARD MARKETING NETWORK 7628 N ARTHUR NAFTALIN 4884 N BANKCARD MARKETING NETWORK 7258 N ARTHUR NAFTALIN 7364 N BANKCARD MARKETING NETWORK 7442 N ARTHUR NAFTALIN 6736 R BANKCARD MARKETING NETWORK 8458 N ASC 6472 N BANKCARD MARKETING NETWORK 8424 N ASC 6987 N BARBADOS TELE-COM 4536 N ASC 4822 N BARBADOS TELE-COM 7545 N ASC 9866 N BARBADOS TELE-COM 3723 N ASC 4389 N BARBADOS TELE-COM 8004 N ASPEN COMMUNICATIONS CORP. 7292 N BARBADOS TELE-COM 8003 N ASPEN COMMUNICATIONS CORP. 7575 R BC TEL 3466 N ASPEN COMMUNICATIONS CORP. 1313 R BC TEL 8006 N ASPEN COMMUNICATIONS CORP. 2574 N BEDFORDSHIRE COMMUNICATIONS 8005 N ASPEN COMMUNICATIONS CORP. 3768 N BEDFORDSHIRE COMMUNICATIONS 4672 N ASSOC. VENTURE SVCS., INC. 9653 N BEDFORDSHIRE COMMUNICATIONS 4222 N ASSOC. VENTURE SVCS., INC. 2279 N BEDFORDSHIRE COMMUNICATIONS 2847 N ASSOC. VENTURE SVCS., INC. 9342 N BEDFORDSHIRE COMMUNICATIONS 4378 N ASSOC. VENTURE SVCS., INC. 7726 N BEJAY COMMUNICATIONS CORP. 2278 N ASSOC. VENTURE SVCS., INC. 5293 N BEJAY COMMUNICATIONS CORP. 4655 N ATLANTIC WEST INTERNATIONAL 7228 N BEJAY COMMUNICATIONS CORP. 7362 N ATLANTIC WEST INTERNATIONAL 8435 N BEJAY COMMUNICATIONS CORP. 4668 N ATLANTIC WEST INTERNATIONAL 7722 N BEJAY COMMUNICATIONS CORP. 4733 N ATLANTIC WEST INTERNATIONAL 7382 N BELAIR COMMUNICATIONS, INC. 7274 N ATLANTIC WEST INTERNATIONAL 8824 N BELAIR COMMUNICATIONS, INC. 1919 N AT&T 5228 N BELAIR COMMUNICATIONS, INC. 1288 N AT&T 6776 N BELAIR COMMUNICATIONS, INC. 1515 R AT&T 5224 N BELAIR COMMUNICATIONS, INC. 4123 N AT&T 6227 N BELINDA S. SIDES 2243 N AUCTION VISION INT'L US, INC. 7455 N BELINDA S. SIDES 8243 N AUCTION VISION INT'L US, INC. 8325 N BELINDA S. SIDES 2786 N AUCTION VISION INT'L US, INC. 7743 N BELINDA S. SIDES 6744 N AUDREY COX 8497 N BELINDA S. SIDES 2592 N AUDREY COX 5454 R BELL ATLANTIC 3629 N AUDREY COX 9985 R BELL ATLANTIC 3879 N AUDREY COX 5665 R BELL ATLANTIC 2736 N AUDREY COX 1515 R BELL ATLANTIC-NJ (GRANDFATHERED)

TYPE N - NATIONAL, R - REGIONAL 72 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 8433 N BELL CANADA 2448 N BRENDAN CORP. 7575 R BELL CANADA 3996 N BRENDAN CORP. 1313 R BELL CANADA 7383 N BRENDAN CORP. 4776 N BELLSOUTH WIRELESS, INC. 2725 N BRENDAN CORP. 4264 N BELLSOUTH WIRELESS, INC. 6328 N BRENDAN CORP. 1616 N BENNETT PUBLICATIONS 5464 N BRIAN WEISBERG 9378 N BERNIE SANSHUCK 4929 N BRIAN WEISBERG 7278 N BERNIE SANSHUCK 5835 N BRIAN WEISBERG 7565 N BERNIE SANSHUCK 2743 N BRIDE'S MAGAZINE 6678 N BERNIE SANSHUCK 5274 N BRIDE'S MAGAZINE 7688 N BERNIE SANSHUCK 9337 N BRIDE'S MAGAZINE 2201 N BETTY JOE, INC. 8728 N BRIDE'S MAGAZINE 2202 N BETTY JOE, INC. 4274 N BRIDE'S MAGAZINE 2204 N BETTY JOE, INC. 9919 R BRITE VOICE SYSTEMS 2205 N BETTY JOE, INC. 6696 R BRITE VOICE SYSTEMS 2203 N BETTY JOE, INC. 3327 R BRITE VOICE SYSTEMS 5682 N BEVERLYWOOD COMM. 4986 R BRITE VOICE SYSTEMS 5639 N BEVERLYWOOD COMM. 4414 R BRITE VOICE SYSTEMS 5426 N BEVERLYWOOD COMM. 8372 N BROOKS TELE-COM SERVICES 5582 N BEVERLYWOOD COMM. 2293 N BROOKS TELE-COM SERVICES 7609 N BF&L 8257 N BROOKS TELE-COM SERVICES 9474 N BF&L 8846 N BROOKS TELE-COM SERVICES 2728 N BF&L 9264 N BROOKS TELE-COM SERVICES 5026 N BF&L 4752 N BT HOLDINGS, INC. 4603 N BF&L 2867 N BT HOLDINGS, INC. 5664 N BG ASSOCIATES 3337 N BT HOLDINGS, INC. 3163 N BG ASSOCIATES 4865 N BT HOLDINGS, INC. 6623 N BG ASSOCIATES 2883 N BT HOLDINGS, INC. 3156 N BG ASSOCIATES 5847 N BT SERVICES, INC. 3227 N BG ASSOCIATES 6239 N BT SERVICES, INC. 7424 N BH INFORMATION CORP. 1661 N BT SERVICES, INC. 6225 N BH INFORMATION CORP. 2661 N BT SERVICES, INC. 5333 N BH INFORMATION CORP. 3786 N BT SERVICES, INC. 2765 N BH INFORMATION CORP. 2582 N BT TELECOM, INC. 2562 N BH INFORMATION CORP. 5842 N BT TELECOM, INC. 1269 N BICOM 2264 N BT TELESIS, INC. 7381 N BICOM 9277 N BT TELESIS, INC. 6423 N BICOM 7466 N BT TELESIS, INC. 8658 N BICOM 5347 N BT TELESIS, INC. 4659 N BICOM 9636 N BTD ENTERPRISES 3312 N BILL CHOBY 3255 N BTD ENTERPRISES 3311 N BILL CHOBY 2399 N BTD ENTERPRISES 4257 N BILLY M. COSPER, JR. 8693 N BTD ENTERPRISES 9328 N BILLY M. COSPER, JR. 4001 N BTNA/TYMNET 4635 N BILLY M. COSPER, JR. 2256 N BTNA/TYMNET 6222 N BILLY M. COSPER, JR. 2272 N BTNA/TYMNET 5100 R BIRMINGHAM NEWS COMPANY 4002 N BTNA/TYMNET 5101 R BIRMINGHAM NEWS COMPANY 3869 N BTNA/TYMNET 5102 R BIRMINGHAM NEWS COMPANY 1234 R BUCKS COUNTY COURIER TIMES 5103 R BIRMINGHAM NEWS COMPANY 6789 R BUCKS COUNTY COURIER TIMES 5104 R BIRMINGHAM NEWS COMPANY 2228 R BUCKS COUNTY COURIER TIMES 7234 N BLAISCH PUBLISHING 4863 N BUC-VIN TELESERVICES 8652 N BLUE AMBER MOTEL, INC. 3975 N BUC-VIN TELESERVICES 0300 N BLUE AMBER MOTEL, INC. 2648 N BUC-VIN TELESERVICES 0900 N BLUE AMBER MOTEL, INC. 7238 N BUC-VIN TELESERVICES 4426 R BLUE RIDGE MOUNTAIN WATER, INC. 4374 N BUC-VIN TELESERVICES 5677 R BLUE RIDGE MOUNTAIN WATER, INC. 4632 N BUDDY HOWE 7289 N BOO ENTERPRISES 4722 N BUDDY HOWE 1929 N BOO ENTERPRISES 8777 N BUDDY HOWE 4345 N BOO ENTERPRISES 2422 N BUDDY HOWE 4434 N BOWIE COMMUNICATIONS 1478 N BUDGET CALL LONG DISTANCE 3734 N BOWIE COMMUNICATIONS 3698 N BUDGET CALL LONG DISTANCE 3745 N BOWIE COMMUNICATIONS 9550 N BUDGET CALL LONG DISTANCE 2783 N BOWIE COMMUNICATIONS 8249 N BURKE TELCOM SERVICES 2693 N BOWIE COMMUNICATIONS 6779 N BURKE TELCOM SERVICES 6622 N BOYD BYERS 8845 N BURKE TELCOM SERVICES 9911 N BOYD BYERS 3548 N BURKE TELCOM SERVICES 8833 N BOYD BYERS 9737 N BURKE TELCOM SERVICES 7711 N BOYD BYERS 1228 R BURLINGTON COUNTY TIMES 9966 N BOYD BYERS 1234 R BURLINGTON COUNTY TIMES

TYPE N - NATIONAL, R - REGIONAL 73 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 3637 N BUSINESS EDGE GROUP 8756 N CECELIA DOWNS 8855 N BUSINESS TO CONSUMER NETWORK 3867 N CECELIA DOWNS 5533 N BUSINESS TO CONSUMER NETWORK 6752 N CG COMMUNICATIONS CORP. 3977 N BUSINESS TO CONSUMER NETWORK 6656 N CG COMMUNICATIONS CORP. 7755 N BUSINESS TO CONSUMER NETWORK 8656 N CG COMMUNICATIONS CORP. 4763 N BUSINESS TO CONSUMER NETWORK 7367 N CG COMMUNICATIONS CORP. 4354 N B.H. COMMUNICATION SERVICE 7348 N CG COMMUNICATIONS CORP. 9688 N B.H. COMMUNICATION SERVICE 4633 N CHAMBERLAIN COMMUNICATIONS 6697 N B.H. COMMUNICATION SERVICE 7754 N CHAMBERLAIN COMMUNICATIONS 2782 N B.H. COMMUNICATION SERVICE 3934 N CHAMBERLAIN COMMUNICATIONS 6682 N B.H. COMMUNICATION SERVICE 7756 N CHAMBERLAIN COMMUNICATIONS 7257 N C C RIDERS 8676 N CHAMBERLAIN COMMUNICATIONS 7544 N C C RIDERS 3645 N CHARLOTTE DUNCAN 8783 N C C RIDERS 6334 N CHARLOTTE DUNCAN 4321 N CABLE & WIRELESS 3473 N CHARLOTTE DUNCAN 4294 N CABLE & WIRELESS 2637 N CHARLOTTE DUNCAN 5294 N CABLE & WIRELESS 2472 N CHARLOTTE DUNCAN 6368 N CABLE & WIRELESS 2555 R CHICAGO TRIBUNE CO. 2944 N CABLE & WIRELESS 9233 N CHRISTINE MARLIN 7374 N CAC TELECOMM, INC. 4627 N CHRISTINE MARLIN 7683 N CAC TELECOMM, INC. 3347 N CHRISTINE MARLIN 3722 N CAC TELECOMM, INC. 3962 N CHRISTINE MARLIN 4837 N CAC TELECOMM, INC. 5447 N CHRISTINE MARLIN 4753 R CAHOKIA-DUPO HERALD 7645 N CHRISTOPHER HALE 4327 R CAHOKIA-DUPO HERALD 8733 N CHRISTOPHER HALE 7378 R CAHOKIA-DUPO HERALD 2386 N CHRISTOPHER P. OBERLE 4646 N CANADA POST CORPORATION 3711 N CHRISTOPHER P. OBERLE 6664 N CANADA POST CORPORATION 2346 N CHRISTOPHER P. OBERLE 2633 N CANADA POST CORPORATION 4778 N CHRISTOPHER P. OBERLE 2828 N CANADA TRUST CO. 2678 N CHRISTOPHER P. OBERLE 2477 R CANADIAN COAST GUARD 2484 N CITIZENS UTILITIES 6287 R CANADIAN COAST GUARD 5050 N CITIZENS UTILITIES 8688 N CAPITAL NETWORK SYSTEM, INC. 7563 N CITY VENTURES 8683 N CAPITAL NETWORK SYSTEM, INC. 7594 N CITY VENTURES 5348 N CARLTON TELEPHONICS CORP. 7598 N CITY VENTURES 4945 N CARLTON TELEPHONICS CORP. 7873 N CLARKE TRANSPORT CANADA 1003 N CARLTON TELEPHONICS CORP. 7677 N CMR COMPANY 2388 N CARLTON TELEPHONICS CORP. 7533 N CMR COMPANY 3591 N CAROL SHAPIRO 5400 N CMR COMPANY 3595 N CAROL SHAPIRO 4364 N CMR COMPANY 1359 N CAROL SHAPIRO 2653 N COCA-COLA BEVERAGES LTD. 3594 N CAROL SHAPIRO 7774 N COMMUNICATIONS VENTURE SVCS., INC. 3598 N CAROL SHAPIRO 4288 N COMMUNICATIONS VENTURE SVCS., INC. 4693 N CAROLINE MEGGINSON 2655 N COMMUNICATIONS VENTURE SVCS., INC. 6847 N CAROLINE MEGGINSON 2771 N COMPUSERVE INCORPORATED 3625 N CAROLINE MEGGINSON 2247 N COMPUSERVE INCORPORATED 4746 N CAROLINE MEGGINSON 4277 N COMPUSERVE INCORPORATED 4365 N CAROLINE MEGGINSON 4267 N COMPUSERVE INCORPORATED 2742 N CAROLYN CHAMBERLAIN 2471 N COMPUSERVE INCORPORATED 8734 N CAROLYN CHAMBERLAIN 4256 N COMPUTER LOAN ORG. SYS. INC 4726 N CAROLYN CHAMBERLAIN 0600 R CONCORD TELEPHONE COMPANY 7972 N CAROLYN CHAMBERLAIN 0500 R CONCORD TELEPHONE COMPANY 2674 N CAROLYN HENRICK 7626 N CONDE NAST TRAVELER 5255 N CAROLYN HENRICK 7225 N CONDE NAST TRAVELER 6679 N CAROLYN HENRICK 1234 R CONDE' NAST/BON APPETIT 4973 N CAROLYN HENRICK 8392 N CONNIE SIMMONS 2972 N CAROLYN HENRICK 9627 N CONNIE SIMMONS 3522 N CATHY S. SURACE 7464 N CONNIE SIMMONS 6247 N CATHY S. SURACE 6969 N CONNIE SIMMONS 5458 N CATHY S. SURACE 7662 N CONNIE SIMMONS 2483 N CATHY S. SURACE 4911 R CONSUMERS GAS 3467 N CATHY S. SURACE 2427 R CONSUMERS GAS 2296 N CCB TELEPHONY, INC. 2852 N CORCORAN GROUP, INC. 8468 N CCB TELEPHONY, INC. 8438 N CORCORAN GROUP, INC. 8672 N CCB TELEPHONY, INC. 3423 N CORCORAN GROUP, INC. 8436 N CCB TELEPHONY, INC. 3599 N CORCORAN GROUP, INC. 6446 N CCB TELEPHONY, INC. 6862 N CORCORAN GROUP, INC. 2394 N CECELIA DOWNS 4387 N CORPORATE TELEMANAGEMENT GROUP 6957 N CECELIA DOWNS 8790 N CORPORATE TELEMANAGEMENT GROUP 6439 N CECELIA DOWNS 0811 R COUNTY PRESS

TYPE N - NATIONAL, R - REGIONAL 74 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 8355 R COUNTY PRESS 3695 N DAVID H. LOCKWOOD 5200 R COWLES MEDIA COMPANY 6425 N DAVID H. LOCKWOOD 2500 R COWLES MEDIA COMPANY 3724 N DAVID H. LOCKWOOD 8500 R COWLES MEDIA COMPANY 1998 R DAVID I. ADELMAN 5800 R COWLES MEDIA COMPANY 5889 N DAVID LUTZ, ESQ. 4346 R COWLES PUBLISHING CO. 8792 N DAVID L. SIMONS 7389 R COWLES PUBLISHING CO. 6963 N DAVID L. SIMONS 7388 R COWLES PUBLISHING CO. 3666 N DAVID L. SIMONS 4643 R COWLES PUBLISHING CO. 2691 N DAVID L. SIMONS 2946 N COX COMMUNICATIONS, INC. 8899 N DAVID W. GOODALE 2269 N COX ENTERPRISES 8877 N DAVID W. GOODALE 2699 N COX TECHNOLOGY INVESTMENTS 9922 N DAVID W. GOODALE 4727 N COX TECHNOLOGY INVESTMENTS 9933 N DAVID W. GOODALE 4269 N COX TECHNOLOGY INVESTMENTS 7356 N DDI CORPORATION 6635 N CRAIG P. LEVINSOHN 5959 N DDI CORPORATION 7883 N CRAIG P. LEVINSOHN 9955 N DDI CORPORATION 0447 N CRAIG 'TAX FREEZE' FREIS 9555 N DDI CORPORATION 0444 N CRAIG 'TAX FREEZE' FREIS 2211 N DDI CORPORATION 0445 N CRAIG 'TAX FREEZE' FREIS 5027 N DEAN R. CHAMBERLAIN 0448 N CRAIG 'TAX FREEZE' FREIS 4456 N DEAN R. CHAMBERLAIN 0446 N CRAIG 'TAX FREEZE' FREIS 7778 N DEAN R. CHAMBERLAIN 2543 N CREATIVE CALL MANAGEMENT 8428 N DEBBIE A. COSPER 2872 N CREATIVE CALL MANAGEMENT 2866 N DEBBIE A. COSPER 2548 N CREATIVE CALL MANAGEMENT 2429 N DEENA JORGENSON 5569 N CREATIVE CALL MANAGEMENT 4442 N DEENA JORGENSON 7446 N CREATIVE DIRECT MARKETING 2435 N DEENA JORGENSON 2733 N CREDIT CENTRAL SVCS., INC. 5388 N DEENA JORGENSON 2756 N CROFT CONSULTANTS 5233 N DEENA JORGENSON 4476 N CROSSCONNECT 6877 N DEJA LOCKWOOD 4362 N CROSSCONNECT 6468 N DEJA LOCKWOOD 8353 N CROSSCONNECT 2877 N DEJA LOCKWOOD 7265 N CROSSCONNECT 5673 N DEJA LOCKWOOD 2723 N CROW INT'L. 5523 N DEJA LOCKWOOD 8911 N CROW INT'L. 7264 N DENNIS TEMPLE 7735 N CROW INT'L. 8876 N DENNIS TEMPLE 1121 N CROW INT'L. 3398 N DENNIS TEMPLE 8678 N CROW INT'L. 2586 N DENNIS TEMPLE 8337 N CRYSTAL MARCUS AUGUST 7762 N DENNIS TEMPLE 9732 N CRYSTAL MARCUS AUGUST 6688 N DENNY BROWN 9344 N CRYSTAL MARCUS AUGUST 9988 N DENNY BROWN 8838 N CRYSTAL MARCUS AUGUST 9977 N DENNY BROWN 8262 N CRYSTAL MARCUS AUGUST 8866 N DENNY BROWN 4205 N CSR ASSOCIATES 6243 N DEREK NESS 7763 N CSR ASSOCIATES 6672 N DEREK NESS 5205 N CSR ASSOCIATES 7761 N DEREK NESS 8083 N CSR ASSOCIATES 7200 N DEREK NESS 4427 N CT FINANCIAL 8273 N DEREK NESS 8772 N CURTIS WORLDWIDE ENTERPRISES, INC. 3382 N DETAILS MAGAZINE 4382 N CURTIS WORLDWIDE ENTERPRISES, INC. 3857 N DETAILS MAGAZINE 4634 N CURTIS WORLDWIDE ENTERPRISES, INC. 3993 N DIANE BAKER-LOCKWOOD 3766 N CURTIS WORLDWIDE ENTERPRISES, INC. 2492 N DIANE BAKER-LOCKWOOD 3636 N CURTIS WORLDWIDE ENTERPRISES, INC. 0980 N DIANE BAKER-LOCKWOOD 8008 N C&C FINANCIAL & COMMUNICATIONS 5445 N DIANE BAKER-LOCKWOOD 8007 N C&C FINANCIAL & COMMUNICATIONS 8482 R DISPATCH 8787 N C&C FINANCIAL & COMMUNICATIONS 9355 R DISPATCH 8653 N C&C FINANCIAL & COMMUNICATIONS 9273 N DIVAD TELECOM 4684 N C&C FINANCIAL & COMMUNICATIONS 4326 N DIVAD TELECOM 9191 R C.H. EPPERT 5273 N DIVAD TELECOM 5911 R C.H. EPPERT 5367 N DIVAD TELECOM 9111 R C.H. EPPERT 3326 N DIVAD TELECOM 0911 R C.H. EPPERT 4529 N DONALD SIMMONS 2787 N DAILY HERALD 4465 N DONALD SIMMONS 2527 N DAILY HERALD 6279 N DONALD SIMMONS 4054 N DANA N. MCKINLEY 8677 N DONNA BROWN 5438 N DARREN CHAFFEE 5577 N DONNA BROWN 0700 N DARREN CHAFFEE 6644 N DONNA BROWN 0200 N DARREN CHAFFEE 8822 N DONNA BROWN 5787 N DARREN CHAFFEE 7733 N DONNA BROWN 6277 N DAVID H. LOCKWOOD 3853 N DPC TELE-SERVICES 9465 N DAVID H. LOCKWOOD 6946 N DPC TELE-SERVICES

TYPE N - NATIONAL, R - REGIONAL 75 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 4844 N DPC TELE-SERVICES 7695 N ELLEN GRAY 9287 N DPC TELE-SERVICES 7432 N ELLEN GRAY 7336 N DPC TELE-SERVICES 7475 N ELLEN GRAY 6624 N DREAM THEME, INC. 7532 N ELLEN GRAY 5366 N DREAM THEME, INC. 9282 N ELLEN SILVERBERG 3267 N DREAM THEME, INC. 6732 N ELLEN SILVERBERG 3245 N DREAM THEME, INC. 4252 N ELLEN SILVERBERG 2257 N DREAM THEME, INC. 4549 N ELLEN SILVERBERG 4588 N DW FITNESS 3925 N ELLEN SILVERBERG 2846 N DW FITNESS 6323 N ELVA GRAUEL 8238 N DW FITNESS 6529 N ELVA GRAUEL 3478 N DW FITNESS 6548 N ELVA GRAUEL 2735 N D. J. ENTERPRISES 6367 N ELVA GRAUEL 4827 N D. J. ENTERPRISES 6369 N ELVA GRAUEL 1222 N D. J. ENTERPRISES 9433 N ENCORE AGENCY 5291 N D. J. ENTERPRISES 4368 R ENCORE AGENCY 4582 N D. J. ENTERPRISES 9662 N ENCORE AGENCY 7633 N D.G. TELECOM SERVICES 2343 N ENCORE AGENCY 8523 N D.G. TELECOM SERVICES 3264 N ENCORE AGENCY 7434 N D.G. TELECOM SERVICES 4348 N ENGULF & DEVOUR 3679 N D.G. TELECOM SERVICES 4879 N ENGULF & DEVOUR 7652 N D.G. TELECOM SERVICES 6464 N ENGULF & DEVOUR 5368 N D.K. COMMUNICATIONS L.L.C. 3584 N ENGULF & DEVOUR 3352 N D.K. COMMUNICATIONS L.L.C. 7632 N ENGULF & DEVOUR 6424 N D.K. COMMUNICATIONS L.L.C. 4246 N ENHANCED TELEPHONE SERVICES, INC. 6395 N D.K. COMMUNICATIONS L.L.C. 0328 N ENHANCED TELEPHONE SERVICES, INC. 2254 N D.K. COMMUNICATIONS L.L.C. 0808 N ENHANCED TELEPHONE SERVICES, INC. 2729 N E OFFICE CORPORATION 0562 N ENHANCED TELEPHONE SERVICES, INC. 0036 N E OFFICE CORPORATION 0909 N ENHANCED TELEPHONE SERVICES, INC. 2026 N E OFFICE CORPORATION 4786 N ENVIRONMENT CANADA 3729 N E OFFICE CORPORATION 9794 R ERNEST J. ANDERSON, JR. 1729 N E OFFICE CORPORATION 9754 R ERNEST J. ANDERSON, JR. 9466 R EARLYBIRD AWARDS, INC. 9769 R ERNEST J. ANDERSON, JR. 3733 R EARLYBIRD AWARDS, INC. 9762 R ERNEST J. ANDERSON, JR. 3433 N EASTON COMPANIES, INC. 9786 R ERNEST J. ANDERSON, JR. 3438 N EASTON COMPANIES, INC. 2363 N ESTHER SIEGEL 8269 N ECCO, INC. 3547 N ESTHER SIEGEL 5824 N ECCO, INC. 3445 N ESTHER SIEGEL 5829 N ECCO, INC. 3428 N ESTHER SIEGEL 2244 N ECCO, INC. 9284 N EUROPEAN AMERICAN TRAVEL, INC. 3324 N ECCO, INC. 5765 R EVENING JOURNAL ASSOCIATION 6292 N ECLIPSE HOLDINGS, INC. 2345 N EXCELL AGENT SERVICES 7262 N ECLIPSE HOLDINGS, INC. 8259 N EXCELL AGENT SERVICES 8437 N EDNA L. MCKINLEY 4968 N EXCELL AGENT SERVICES 1825 N EDNA L. MCKINLEY 1463 N EXCELL AGENT SERVICES 3618 N EDNA L. MCKINLEY 3838 N EXCELL AGENT SERVICES 6232 N EDNA L. MCKINLEY 2752 N EXECUTIVE TELERESEARCH, INC. 4654 N EDNA L. MCKINLEY 6784 N EXECUTIVE TELERESEARCH, INC. 2893 N EFGH, INC. 8623 N EXECUTIVE TELERESEARCH, INC. 8326 N EFGH, INC. 7838 N EXECUTIVE TELERESEARCH, INC. 5624 N EFGH, INC. 2842 N EXECUTIVE TELERESEARCH, INC. 2658 N EFGH, INC. 2874 N EXOTIC SERVICES, INC. 9487 N EILEEN LOCKWOOD 4297 N EXOTIC SERVICES, INC. 4857 N EILEEN LOCKWOOD 7588 N EXOTIC SERVICES, INC. 2953 N EILEEN LOCKWOOD 5487 N FAC PINS 2552 N EILEEN LOCKWOOD 6393 N FAC PINS 9225 N EILEEN LOCKWOOD 5262 N FAC PINS 5865 N ELAINE CALLINAN 3973 N FAC PINS 4966 N ELAINE CALLINAN 8425 N FALCONWOOD CORPORATION 3464 N ELAINE CALLINAN 8423 N FALCONWOOD CORPORATION 5453 N ELAINE CALLINAN 8885 N FALCONWOOD CORPORATION 5245 N ELAINE CALLINAN 7328 N FALCONWOOD CORPORATION 3542 N ELECTRIC LIGHTWAVE, INC. 8858 N FALCONWOOD CORPORATION 3544 N ELECTRIC LIGHTWAVE, INC. 2297 N FALSTAFF TELE-COM 3545 N ELECTRIC LIGHTWAVE, INC. 2567 N FALSTAFF TELE-COM 3541 N ELECTRIC LIGHTWAVE, INC. 8584 N FALSTAFF TELE-COM 3543 N ELECTRIC LIGHTWAVE, INC. 3384 N FALSTAFF TELE-COM 2287 N ELIZABETH DOWLING 2469 N FALSTAFF TELE-COM 5327 N ELIZABETH DOWLING 3462 N FCS, INC. 7522 N ELLEN GRAY 2384 N FIBERLINK, INC.

TYPE N - NATIONAL, R - REGIONAL 76 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 5326 N FIBERLINK, INC. 4424 R GCI CORP. 2097 N FIBERLINK, INC. 1313 R GCI CORP. 3410 N FIBERLINK, INC. 4428 N GEICO INSURANCE CO. 5839 N FIBERLINK, INC. 4528 N GEICO INSURANCE CO. 4488 N FINANCIAL TELESYS CORP. 4328 N GEICO INSURANCE CO. 2566 N FINANCIAL TELESYS CORP. 4628 N GEICO INSURANCE CO. 3266 N FINANCIAL TELESYS CORP. 4728 N GEICO INSURANCE CO. 3634 N FINANCIAL TELESYS CORP. 7929 N GEORGE LOCKWOOD 7866 N FINANCIAL TELESYS CORP. 2745 N GEORGE LOCKWOOD 6669 N FINANCIAL VENTURES SVCS. 6834 N GEORGE LOCKWOOD 2622 N FINANCIAL VENTURES SVCS. 2444 N GEORGE LOCKWOOD 6737 N FIRST DATA INTEGRATED SERVICES, INC. 2937 N GEORGE LOCKWOOD 4233 N FLAMELESS HEAT, INC. 4972 R GEORGIA TELEVISION COMPANY 5397 N FLAMELESS HEAT, INC. 3274 N GLAMOUR MAGAZINE 7829 N FLAMELESS HEAT, INC. 4526 N GLAMOUR MAGAZINE 2233 N FLAMELESS HEAT, INC. 7366 N GLOBAL TECHNOLOGY CORP. 2489 N FLIGHT RESOURCES, INC. 4323 N GLOBAL TECHNOLOGY CORP. 4375 R FLORIDA POWER & LIGHT COMPANY 3472 N GLOBAL TECHNOLOGY CORP. 2754 R FONES WEST 3648 N GLOBAL TECHNOLOGY CORP. 8245 R FONES WEST 4821 N GLOBAL TECHNOLOGY CORP. 8682 N FRANCES H. NAFTALIN 9463 N GOURMET MAGAZINE 9853 N FRANCES H. NAFTALIN 8646 N GOURMET MAGAZINE 8749 N FRANCES H. NAFTALIN 7895 N GQ MAGAZINE 8343 N FRANCES H. NAFTALIN 3348 N GQ MAGAZINE 8926 N FRANCES H. NAFTALIN 9389 N G-R TELCOM SERVICES, INC. 1234 R FRESNO BEE 7395 N G-R TELCOM SERVICES, INC. 5383 N FTD DIRECT ACCESS, INC. 4696 N G-R TELCOM SERVICES, INC. 9000 N FTD DIRECT ACCESS, INC. 9387 N G-R TELCOM SERVICES, INC. 3831 N FTD DIRECT ACCESS, INC. 4682 N G-R TELCOM SERVICES, INC. 3509 N FTD DIRECT ACCESS, INC. 4774 R GRAND RAPIDS PRESS 2383 N FTD DIRECT ACCESS, INC. 4773 R GRAND RAPIDS PRESS 6733 N FTW, INC. 4775 R GRAND RAPIDS PRESS 3328 N FTW, INC. 4771 R GRAND RAPIDS PRESS 4279 N G & W COMMUNICATIONS 4772 R GRAND RAPIDS PRESS 9464 N G & W COMMUNICATIONS 7924 N GRANT JORGENSON 7692 N G & W COMMUNICATIONS 5338 N GRANT JORGENSON 5263 N G & W COMMUNICATIONS 7536 N GRANT JORGENSON 5277 N G & W COMMUNICATIONS 3747 N GRANT JORGENSON 3393 N GAIL MARIE NAFTALIN 3573 N GRANT JORGENSON 3233 N GAIL MARIE NAFTALIN 4242 R GREGORY WING 2382 N GAIL MARIE NAFTALIN 4724 R GREGORY WING 3538 N GAIL MARIE NAFTALIN 4676 R GREGORY WING 3286 N GAIL MARIE NAFTALIN 7324 R GREGORY WING 6335 N GAITHER COMMUNICATIONS 4433 R GTE 2722 N GAITHER COMMUNICATIONS 3434 R GTE TELEPHONE OPERATIONS CO. 3377 N GAITHER COMMUNICATIONS 8228 N G.R.F. COMMUNICATION SERVICES 3374 N GAITHER COMMUNICATIONS 2443 N G.R.F. COMMUNICATION SERVICES 3386 N GAITHER COMMUNICATIONS 3285 N G.R.F. COMMUNICATION SERVICES 6663 N GAME SERVICES CORPORATION 3364 N G.R.F. COMMUNICATION SERVICES 5378 N GAME SERVICES CORPORATION 6447 N G.R.F. COMMUNICATION SERVICES 7342 N GAME SERVICES CORPORATION 6000 N HALICO, INC. 8697 N GAME SERVICES CORPORATION 7000 N HALICO, INC. 5656 N GANNETT CO., INC. 1414 N HALICO, INC. 9595 N GANNETT CO., INC. 8721 N HALICO, INC. 8585 N GANNETT CO., INC. 3444 N HAMMERLY PRODUCTIONS 3535 N GANNETT CO., INC. 4645 N HAMMERLY PRODUCTIONS 6565 N GANNETT CO., INC. 7337 N HAMMERLY PRODUCTIONS 7300 N GARY W. ANDERSON 4283 N HAMMERLY PRODUCTIONS 3592 N GARY W. ANDERSON 5762 N HAMMERLY PRODUCTIONS 3596 N GARY W. ANDERSON 5394 N HANK PRENSKY 5359 N GARY W. ANDERSON 5843 N HANK PRENSKY 2348 N GARY W. ANDERSON 5658 N HANK PRENSKY 9224 N GAW TELECOM RESOURCES 5666 N HANK PRENSKY 9486 N GAW TELECOM RESOURCES 4976 N HANK PRENSKY 9334 N GAW TELECOM RESOURCES 8690 N HANNAH SHAPIRO 6685 N GAW TELECOM RESOURCES 8087 N HANNAH SHAPIRO 6667 N GAW TELECOM RESOURCES 3073 N HANNAH SHAPIRO 6689 R GAZETTE NEWSPAPERS 8096 N HANNAH SHAPIRO 9559 R GAZETTE NEWSPAPERS 6543 N HANNAH SHAPIRO 2329 R GAZETTE NEWSPAPERS 5433 N HEALTH VENTURE SVCS., INC.

TYPE N - NATIONAL, R - REGIONAL 77 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 2873 N HEALTH VENTURE SVCS., INC. 4666 R INSTITUTIONAL INVESTOR 8090 N HEALTH VENTURE SVCS., INC. 2700 N INTEGRATED DATA CONCEPTS 4606 N HEALTH VENTURE SVCS., INC. 1221 N INTEGRATED DATA CONCEPTS 4325 N HEALTH VENTURE SVCS., INC. 5494 N INTEGRATED DATA CONCEPTS 3411 N HEBENSTREIT COMMUNICATIONS 3297 N INTEGRATED DATA CONCEPTS 4040 R HERALD-S.C. 5432 N INTEGRATED DATA CONCEPTS 4022 R HERALD-S.C. 6384 N INTELISYS TECHNOLOGICA, INC. 4044 R HERALD-S.C. 6383 N INTELISYS TECHNOLOGICA, INC. 1213 R HERALD-WA. 6382 N INTELISYS TECHNOLOGICA, INC. 4359 R HERALD-WA. 4932 N INTELISYS TECHNOLOGICA, INC. 1891 R HERALD-WA. 6380 N INTELISYS TECHNOLOGICA, INC. 4100 N HERITAGE INFORMATION SERVICES 4686 N INTELLICOM 5200 R HERITAGE INFORMATION SERVICES 8928 N INTER ACTIVE TELECOM 1400 R HERITAGE INFORMATION SERVICES 8447 N INTERACTIVE DEVICES 3500 R HERITAGE INFORMATION SERVICES 5669 N INTERACTIVE VIDEO ENTERPRISES 2969 N HIGH INTEREST COMMUNICATIONS 8283 N INTERACTIVE VIDEO ENTERPRISES 4664 N HIGH INTEREST COMMUNICATIONS 2455 N INTERACTIVE VIDEO ENTERPRISES 6324 N HIGH INTEREST COMMUNICATIONS 4289 N INTERACTIVE VIDEO ENTERPRISES 6937 N HIGH INTEREST COMMUNICATIONS 5289 N INTERACTIVE VIDEO ENTERPRISES 2368 N HIGH INTEREST COMMUNICATIONS 3699 N INTERNATIONAL PRIVATE ACCESS 5323 R HIGHLAND NEWS LEADER 6786 N INTERNATIONAL TELEPHONE MAIL 5478 R HOMES FOR SALE 7586 N INTERNATIONAL TELEPHONE MAIL 6736 R HOMES FOR SALE 3683 N INTERNATIONAL TELEPHONE MAIL 3976 N HOOT N HOLLER PUBLICATIONS, INC. 2447 N INTERNATIONAL TELEPHONE MAIL 6638 N HOOT N HOLLER PUBLICATIONS, INC. 9333 N INTERNATIONAL TELEPHONE MAIL 0007 N HOOT N HOLLER PUBLICATIONS, INC. 2732 N INTERNATIONAL TELESIS, INC. 7469 N HOOT N HOLLER PUBLICATIONS, INC. 9483 N INTERNATIONAL TELESIS, INC. 3424 N HOWARD JONAS 3732 N INTERNATIONAL TELESIS, INC. 9297 N HOWARD JONAS 4864 N INTERNATIONAL TELESIS, INC. 2334 N HOWARD JONAS 4384 N INTERNATIONAL TELESIS, INC. 6783 N HOWARD JONAS 4779 N INT'L DEVELOPMENT & ENTERPRISE 3764 N HOWARD JONAS 3477 N INT'L DEVELOPMENT & ENTERPRISE 1000 R HUNTSVILLE TIMES 1776 N INT'L DEVELOPMENT & ENTERPRISE 1500 R HUNTSVILLE TIMES 4872 N INT'L DEVELOPMENT & ENTERPRISE 3866 R HUNTSVILLE TIMES 2446 N INT'L DEVELOPMENT & ENTERPRISE 1369 N HUTCH CO. 1846 N INVESTMENT ENGINEERS 7352 N HUTCH CO. 1850 N INVESTMENT ENGINEERS 1238 N HUTCH CO. 1849 N INVESTMENT ENGINEERS 8782 N HUTCH CO. 1847 N INVESTMENT ENGINEERS 4689 N ICS HOLDINGS COMPANY 1848 N INVESTMENT ENGINEERS 6533 N ICS HOLDINGS COMPANY 2537 N IQ, INC. 2376 N ICS HOLDINGS COMPANY 5001 N IQ, INC. 7766 N ICS HOLDINGS COMPANY 5003 N IQ, INC. 4286 N ICS NETWORKS, INC. 5002 N IQ, INC. 4824 N ICS NETWORKS, INC. 5004 N IQ, INC. 2923 N ICS NETWORKS, INC. 8333 R ISLAND PACKET 5637 N ICS NETWORKS, INC. 4473 N J & T TELECOM CORP. 6283 N IJKL, INC. 3835 N J & T TELECOM CORP. 5878 N IJKL, INC. 8267 N J & T TELECOM CORP. 7435 N IJKL, INC. 2532 N J & T TELECOM CORP. 2697 N IJKL, INC. 3877 N J & T TELECOM CORP. 2727 N INFO ACCESS, INC. 8225 N JA ASSOCIATES 3232 N INFO ACCESS, INC. 9322 N JA ASSOCIATES 1818 N INFONXX 3376 N JA ASSOCIATES 9373 N INKICOMM, INC. 3335 N JA ASSOCIATES 8338 N INKICOMM, INC. 3299 R JACKSON CITIZEN PATRIOT 8692 N INKICOMM, INC. 7468 N JAM RESEARCH 8848 N INKICOMM, INC. 9668 N JAM RESEARCH 8002 N INKICOMM, INC. 3668 N JAM RESEARCH 0333 N INPHONEMATION, INC. 4869 N JAM RESEARCH 0222 N INPHONEMATION, INC. 7463 N JAM RESEARCH 4440 N INPHONEMATION, INC. 2039 N JAMES E. BOGAR 4441 R INPHONEMATION, INC. 8097 N JAMES E. BOGAR 2220 N INPHONEMATION, INC. 6069 N JAMES E. BOGAR 7244 N INPUT COMMUNICATIONS 5460 N JAMES E. BOGAR 7226 N INPUT COMMUNICATIONS 7005 N JAMES E. BOGAR 5292 N INPUT COMMUNICATIONS 4742 N JAMES F. BISHER, JR. 8768 N INPUT COMMUNICATIONS 0565 N JAMES F. BISHER, JR. 8675 N INPUT COMMUNICATIONS 1941 N JAMES F. BISHER, JR. 4463 N INSTITUTIONAL INVESTOR 6064 N JAMES F. BISHER, JR.

TYPE N - NATIONAL, R - REGIONAL 78 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 3536 N JAMES MARLIN 8358 N JOEL PACKER 5558 N JAMES MARLIN 7242 N JOEL PACKER 7658 N JAMES MARLIN 5784 N JOEL PACKER 5969 N JAMES MARLIN 2283 N JOLT COMMUNICATIONS, INC. 3422 N JAMES MARLIN 4563 N JOLT COMMUNICATIONS, INC. 3426 N JAMES R. WALZ 3354 N JOLT COMMUNICATIONS, INC. 7387 R JAMES R. WALZ 7297 N JONATHAN FINESTONE 6833 N JAMES R. WALZ 0400 N JONATHAN FINESTONE 7378 R JAMES R. WALZ 8345 N JONATHAN FINESTONE 3539 N JAMIESON CORPORATION 8754 N JONATHAN FINESTONE 7268 N JAMIESON CORPORATION 2228 R JOSEPH BASIL MILLER 8746 N JAMIESON CORPORATION 4422 R JOSEPH BASIL MILLER 7528 N JAMIESON CORPORATION 3322 R JOSEPH BASIL MILLER 7946 N JAMIESON CORPORATION 8555 R JOSEPH BASIL MILLER 3432 N JARDINE TELE-COM 0811 R JOSEPH BASIL MILLER 7474 N JARDINE TELE-COM 3452 N JOSEPH WEISS 8368 N JARDINE TELE-COM 3262 N JOSEPH WEISS 5328 N JARDINE TELE-COM 6699 N JOY BOYD 7672 N JARDINE TELE-COM 6633 N JOY BOYD 6272 N JAY R. SHELL, P.C. 7744 N JOY BOYD 2766 N JEFF SEAL 8844 N JOY BOYD 6844 N JEFF SEAL 8789 N JOY ENTERPRISES, INC. 4868 N JEFF SEAL 8276 N JOY ENTERPRISES, INC. 0988 N JEFF SPANG 3448 N JOYCE S. MARKHAM 8488 N JEFF SPANG 5633 N JOYCE S. MARKHAM 1761 N JEFF SPANG 7932 N JOYCE S. MARKHAM 3239 N JEFF SPANG 2423 N JOYCE S. MARKHAM 5788 N JEFF SPANG 9677 N JOYCE S. MARKHAM 6451 N JENNIFER LEOPOLD 3772 N JR NETWORK SERVICES 6221 N JENNIFER LEOPOLD 3677 N JR NETWORK SERVICES 6351 N JENNIFER LEOPOLD 3496 N JR NETWORK SERVICES 2796 N JEROME SACHS 3632 N JR NETWORK SERVICES 2737 N JEROME SACHS 5562 N JRR RESEARCH, INC. 2576 N JEROME SACHS 4353 N JRR RESEARCH, INC. 3237 N JEROME SACHS 8474 N JRR RESEARCH, INC. 2577 N JEROME SACHS 7445 N JRR RESEARCH, INC. 4447 N JERRY LOCKWOOD 7327 N JRR RESEARCH, INC. 5492 N JERRY LOCKWOOD 2773 N J&S COMMUNICATIONS SVCS. 4695 N JERRY LOCKWOOD 8284 N J&S COMMUNICATIONS SVCS. 6373 N JERRY LOCKWOOD 6466 N J&S COMMUNICATIONS SVCS. 6436 N JERRY LOCKWOOD 4554 N J&S COMMUNICATIONS SVCS. 4533 N JESSICA JONAS 3224 N J&S COMMUNICATIONS SVCS. 8664 N JESSICA JONAS 6738 N J.A.H. ENTERPRISES 2389 N JESSICA JONAS 4462 N J.A.H. ENTERPRISES 3696 N JESSICA JONAS 7822 N J.B. TELECOM, INC. 6665 N JESSICA JONAS 7239 N J.B. TELECOM, INC. 4510 N JETSET TOURS, INC. (NA) 2777 N J.B. TELECOM, INC. 4515 N JETSET TOURS, INC. (NA) 7288 N J.B. TELECOM, INC. 3873 N JETSET TOURS, INC. (NA) 8475 N J.B. TELECOM, INC. 8376 N JFC TELECOMM, INC. 3834 N J.S. TELE-COM SERVICES 4556 N JFC TELECOMM, INC. 3528 N J.S. TELE-COM SERVICES 5363 N JFC TELECOMM, INC. 4232 N J.S. TELE-COM SERVICES 2436 N JFC TELECOMM, INC. 4888 N J.S. TELE-COM SERVICES 8893 N JFR NUMBER SYSTEMS 2753 N J.S. TELE-COM SERVICES 2372 N JFR NUMBER SYSTEMS 4685 R KABC RADIO, INC. 5372 N JFR NUMBER SYSTEMS 7655 R KABC RADIO, INC. 8872 N JFR NUMBER SYSTEMS 5672 R KABC RADIO, INC. 3684 N JFR NUMBER SYSTEMS 5552 R KALAMAZOO GAZETTE 4842 N JILL CARTER CONSULTING 5264 R KALAMAZOO GAZETTE 7828 N JILL CARTER CONSULTING 1000 R KALAMAZOO GAZETTE 8426 N JILL CARTER CONSULTING 5554 R KALAMAZOO GAZETTE 9283 N JILL CARTER CONSULTING 5553 R KALAMAZOO GAZETTE 8387 N JILL CARTER CONSULTING 9473 N KAMARIS ASSOCIATES 4083 N JOANN T. SHAPIRO 9437 N KAMARIS ASSOCIATES 6083 N JOANN T. SHAPIRO 6900 R KANSAS CITY STAR 4063 N JOANN T. SHAPIRO 5867 N KAREN LOCKWOOD 4087 N JOANN T. SHAPIRO 5652 N KAREN LOCKWOOD 7406 N JOANN T. SHAPIRO 3293 N KAREN LOCKWOOD 5797 N JOEL PACKER 4478 N KAREN LOCKWOOD 9336 N JOEL PACKER 7569 N KAREN LOCKWOOD

TYPE N - NATIONAL, R - REGIONAL 79 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 6563 N KAR-TEL COMMUNICATIONS 6984 N LEESBURG TEL-COM SERVICES 6556 N KAR-TEL COMMUNICATIONS 6966 N LEESBURG TEL-COM SERVICES 6546 N KAR-TEL COMMUNICATIONS 6976 N LEESBURG TEL-COM SERVICES 6527 N KAR-TEL COMMUNICATIONS 6936 N LEESBURG TEL-COM SERVICES 6587 N KAR-TEL COMMUNICATIONS 6956 N LEESBURG TEL-COM SERVICES 5802 N KATHLEEN A. ANDERSON 2687 R LEGAL COMMUNICATION CORP. 5801 N KATHLEEN A. ANDERSON 5322 R LEGAL COMMUNICATION CORP. 5804 N KATHLEEN A. ANDERSON 6883 N LEGAL TELCOM SYSTEMS, INC. 5803 N KATHLEEN A. ANDERSON 2757 N LEGAL TELCOM SYSTEMS, INC. 5805 N KATHLEEN A. ANDERSON 7284 N LEGAL TELCOM SYSTEMS, INC. 5864 N KATHLEEN S. ANDERSON 6746 N LEGAL TELCOM SYSTEMS, INC. 4542 N KATHLEEN S. ANDERSON 6882 N LEGAL TELCOM SYSTEMS, INC. 7727 N KATHLEEN S. ANDERSON 5329 N LEGI-TECH 4769 N KATHLEEN S. ANDERSON 7674 N LEVINSOHN GROUP, II, INC. 9355 R KATHLEEN S. ANDERSON 2831 N LEVINSOHN GROUP, II, INC. 6954 N KENSINGTON PHYSICAL THERAPY 6772 N LEVITHI ASSOCIATES 6249 N KENSINGTON PHYSICAL THERAPY 7732 N LEVITHI ASSOCIATES 8668 N KENSINGTON PHYSICAL THERAPY 3653 N LEVITHI ASSOCIATES 9370 N KENSINGTON PHYSICAL THERAPY 7700 N LEXICOM, INC. 3028 N KENSINGTON PHYSICAL THERAPY 6600 N LEXICOM, INC. 4534 N KFT, INC. 9900 N LEXICOM, INC. 5600 R KGO-ABC/CAPITAL CITIES 8800 N LEXICOM, INC. 8100 R KGO-ABC/CAPITAL CITIES 0528 R LEXINGTON TELEPHONE CO. 5686 R KHQ INCORPORATED 0527 R LEXINGTON TELEPHONE CO. 5646 N KIRA CORP. 0529 R LEXINGTON TELEPHONE CO. 6686 N KIRA CORP. 0526 R LEXINGTON TELEPHONE CO. 7933 N KIRA CORP. 0525 R LEXINGTON TELEPHONE CO. 7326 N KIRA CORP. 2428 N LIFE ZONE SERVICES 6537 N KIRA CORP. 8427 N LIFE ZONE SERVICES 7685 N KLM & R COMMUNICATIONS 2349 N LINDA D. ANDERSON 1265 N KLM & R COMMUNICATIONS 2466 N LINDA D. ANDERSON 5355 N KLM & R COMMUNICATIONS 4967 N LINDA D. ANDERSON 3788 N KLM & R COMMUNICATIONS 3455 N LINDA D. ANDERSON 1525 N KLM & R COMMUNICATIONS 6388 N LINDA D. ANDERSON 2643 N KNR ASSOCIATES 1638 N LIONESS ASSOCIATES 5539 N KNR ASSOCIATES 7547 N LIONESS ASSOCIATES 7403 N KPT MANAGEMENT CORP. 5638 N LIONESS ASSOCIATES 3746 N KPT MANAGEMENT CORP. 0664 N LIONESS ASSOCIATES 9075 N KPT MANAGEMENT CORP. 8293 N LISA TENNEY 6063 N KPT MANAGEMENT CORP. 7729 N LISA TENNEY 5083 N KPT MANAGEMENT CORP. 8762 N LISA TENNEY 9292 R KQRS, INC. 8443 N LISA TENNEY 9393 R KQRS, INC. 2424 N LOCAL EXCHANGE CO. 3692 R KTVU, INC. 2626 N LOCAL EXCHANGE CO. 5888 R KTVU, INC. 2323 N LOCAL EXCHANGE CO. 4426 R KTVU, INC. 7286 N LORRIE KLINE KAPLAN 3375 N K.M. COMMUNICATION SERVICES 6952 N LORRIE KLINE KAPLAN 3427 N K.M. COMMUNICATION SERVICES 6932 N LORRIE KLINE KAPLAN 7783 N K.M. COMMUNICATION SERVICES 6887 N LORRIE KLINE KAPLAN 7782 N K.M. COMMUNICATION SERVICES 7237 N LORRIE KLINE KAPLAN 6342 N K.M. COMMUNICATION SERVICES 7249 N LOS ANGELES GARLIC FESTIVAL 7865 R LANCASTER NEWSPAPERS, INC. 4275 N LOS ANGELES GARLIC FESTIVAL 7555 R LANCASTER NEWSPAPERS, INC. 5247 N LOS ANGELES GARLIC FESTIVAL 4422 R LANCASTER NEWSPAPERS, INC. 6398 N LOS ANGELES GARLIC FESTIVAL 8555 R LANCASTER NEWSPAPERS, INC. 3242 N LUBBOCK COMMUNICATIONS SVCS. 3322 R LANCASTER NEWSPAPERS, INC. 3244 N LUBBOCK COMMUNICATIONS SVCS. 6372 N LANSDALE COMMUNICATIONS 3844 N LUBBOCK COMMUNICATIONS SVCS. 6426 N LANSDALE COMMUNICATIONS 7392 N LUBBOCK COMMUNICATIONS SVCS. 2475 N LANSDALE COMMUNICATIONS 4376 N LUBBOCK COMMUNICATIONS SVCS. 6362 N LANSDALE COMMUNICATIONS 6553 N MADEMOISELLE 8432 N LANSDALE COMMUNICATIONS 4237 N MADEMOISELLE 5324 N LAW OFFICES OF M.I. ROSENBERG 2328 N MADEMOISELLE 6482 N LAW OFFICES OF M.I. ROSENBERG 5239 N MADISON TELEMEDIA 1199 N LDC ENTERPRISES 6749 N MADISON TELEMEDIA 4631 N LDC ENTERPRISES 9329 N MANHATTAN ENTERPRISES 6233 N LDC ENTERPRISES 9323 N MANHATTAN ENTERPRISES 0516 N LDC ENTERPRISES 9325 N MANHATTAN ENTERPRISES 4734 N LDC ENTERPRISES 9324 N MANHATTAN ENTERPRISES 4949 R LEDGER DISPATCH 9320 N MANHATTAN ENTERPRISES 5353 R LEDGER DISPATCH 2734 N MANHEIM AUTO AUCTIONS, INC.

TYPE N - NATIONAL, R - REGIONAL 80 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 3944 N MANLEY COMMUNICATION SERVICES 5862 N MERCER COMMUNICATIONS 3553 N MANLEY COMMUNICATION SERVICES 6668 N MERCER COMMUNICATIONS 8346 N MANLEY COMMUNICATION SERVICES 4363 N MERCER COMMUNICATIONS 6293 N MANLEY COMMUNICATION SERVICES 9244 R MERCURY NEW MEDIA 6978 N MANLEY COMMUNICATION SERVICES 2687 R MERCURY NEW MEDIA 6263 R MARISSA JOURNAL 4040 R MERCURY NEW MEDIA 8355 R MARISSA JOURNAL 3296 R MERCURY NEW MEDIA 2625 R MARISSA JOURNAL 5411 N METRO ONE DIRECT 2473 N MARK PAUL BORNSTEIN 4555 N METRO ONE DIRECT 6766 N MARK PAUL BORNSTEIN 1860 R METRO TELECOMM SERVICES 9686 N MARK PAUL BORNSTEIN 4327 R METRO TELECOMM SERVICES 2656 N MARK PAUL BORNSTEIN 1010 R METROPOLITAN POLICE DEPARTMENT 6269 N MARK PAUL BORNSTEIN 2464 N MF INDUSTRIES 2253 N MARK TELECOM, LTD. 5466 N MF INDUSTRIES 6267 N MARK TELECOM, LTD. 3647 N MF INDUSTRIES 6275 N MARK TELECOM, LTD. 7568 N MF INDUSTRIES 3287 N MARK TELECOM, LTD. 8655 N MG COMMUNICATIONS, INC. 4849 N MARK TELECOM, LTD. 8765 N MG COMMUNICATIONS, INC. 3486 N MARKET DEVELOPMENT CORP. 8698 N MG COMMUNICATIONS, INC. 2862 N MARKET DEVELOPMENT CORP. 8649 N MG COMMUNICATIONS, INC. 2367 N MARKET DEVELOPMENT CORP. 8673 N MG COMMUNICATIONS, INC. 2664 N MARKET DEVELOPMENT CORP. 4947 N MICHAEL ABRAHAMS 2894 N MARKET DEVELOPMENT CORP. 5691 N MICHAEL ABRAHAMS 7747 N MARKET POWER, INC. 4852 N MICHAEL ABRAHAMS 2557 N MARKET POWER, INC. 4748 N MICHAEL ABRAHAMS 6634 N MARKET POWER, INC. 3487 N MICHAEL ABRAHAMS 5488 N MARKET SHARE, INC. 5299 N MICHAEL B. MAW 2654 N MARKET SHARE, INC. 3367 N MICHAEL B. MAW 8253 N MARKET SHARE, INC. 2425 N MICHAEL B. MAW 7488 N MARKET SHARE, INC. 2474 N MICHAEL B. MAW 8366 N MARKET SHARE, INC. 8723 N MICHAEL B. MAW 1311 R MARKETLINK INC 4739 N MICHAEL SMITH 8989 N MARY J. IMHOFF 5647 N MICHAEL TABOR 7979 N MARY J. IMHOFF 4276 N MICHAEL TABOR 9494 N MARY J. IMHOFF 5634 N MICHAEL TABOR 8484 N MARY J. IMHOFF 2879 N MICHAEL TABOR 7171 N MARY J. IMHOFF 5655 N MICHAEL TABOR 4656 N MARY MOEHLE 4662 N MICHIGAN NAT'L BANK 4853 N MARY MOEHLE 6060 N MID ATLANTIC TELECOM 2668 N MARY MOEHLE 7890 N MID ATLANTIC TELECOM 2688 N MARY MOEHLE 2580 N MID ATLANTIC TELECOM 9262 N MARYLAND TEL-COM SERVICES 0000 N MID ATLANTIC TELECOM 3443 N MARYLAND TEL-COM SERVICES 1787 N MIDDLE AMERICA TALK NETWORK 3437 N MARYLAND TEL-COM SERVICES 5501 N MIDDLE AMERICA TALK NETWORK 4224 N MARYLAND TEL-COM SERVICES 1786 N MIDDLE AMERICA TALK NETWORK 6228 N MARYLAND TEL-COM SERVICES 2311 N MIDDLE AMERICA TALK NETWORK 2875 N MATHEWS AERIAL SERVICES, INC. 5502 N MIDDLE AMERICA TALK NETWORK 7647 N MATHEWS AERIAL SERVICES, INC. 7653 N MIDDLEWAVE TELECOM CORP 3288 N MATHEWS AERIAL SERVICES, INC. 8748 N MIDDLEWAVE TELECOM CORP 2411 N MATHEWS AERIAL SERVICES, INC. 6238 N MIKE MOEHLE 5424 N MATHEWS AERIAL SERVICES, INC. 2769 N MIKE MOEHLE 4262 N MATT OLSON 4546 N MINDSCAPE 3321 N MATT OLSON 5377 N MINDSCAPE 4477 N MATT OLSON 5225 N MINDSCAPE 1040 N MATT OLSON 7543 N MINDSCAPE 7736 N MCDONALD COMMUNICATION SERVICES 4846 N MINDSCAPE 8388 N MCDONALD COMMUNICATION SERVICES 0022 N MIRAGE MARKETING 9448 N MCDONALD COMMUNICATION SERVICES 0077 N MIRAGE MARKETING 7826 N MCDONALD COMMUNICATION SERVICES 0033 N MIRAGE MARKETING 6734 N MCDONALD COMMUNICATION SERVICES 0044 N MIRAGE MARKETING 4239 N MCI MAIL 0066 N MIRAGE MARKETING 4334 N MCI MAIL 5680 N MOBILE PRESS REGISTER, INC. 4266 N MEDIA VENTURE SVCS., INC. 7693 N MOBIUS RESEARCH 7679 N MELISSA NOLIN 2266 N MOBIUS RESEARCH 8469 N MELISSA NOLIN 1227 N MOBIUS RESEARCH 8547 N MELISSA NOLIN 1426 N MOBIUS RESEARCH 8627 N MELISSA NOLIN 6381 N MOBIUS RESEARCH 8491 N MELISSA NOLIN 4383 N MODAMAS INC 6427 N MENAGERIE RESTAURANTS, INC. 7363 N MODAMAS INC 5896 N MERCER COMMUNICATIONS 7500 R MODESTO BEE

TYPE N - NATIONAL, R - REGIONAL 81 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 9500 R MODESTO BEE 6432 N NEED COMMUNICATIONS, INC. 8696 R MORGAN HILL TIMES 7926 N NETWORK BILLING SYSTEMS, LLC 4800 N MORTGAGE MARKET INFO SVCS 8873 N NETWORK BILLING SYSTEMS, LLC 8499 N MOVIEFONE, INC. 4373 N NETWORK BILLING SYSTEMS, LLC 3549 N MOVIEFONE, INC. 4762 N NETWORK BILLING SYSTEMS, LLC 1313 R MTS 4767 N NETWORK BILLING SYSTEMS, LLC 7575 R MTS 9453 N NETWORK TELEPHONE SERVICES, INC. 7575 R MT&T 7391 N NETWORK TELEPHONE SERVICES, INC. 1313 R MT&T 8462 N NETWORK TELEPHONE SERVICES, INC. 7770 R MULTICOM, DIV. OF DE GROUPE QUEBECOR INC. 2868 N NETWORK TELEPHONE SERVICES, INC. 3226 R MURIETA TIMES 7825 N NETWORK TELEPHONE SERVICES, INC. 7676 R MURIETA TIMES 3225 N NETWORK USA 8637 R MURIETA TIMES 6872 N NETWORK USA 7746 N MUSIC LINE 7638 N NEUROLOGY CLINIC, P.C. 4687 N MUSIC LINE 6288 N NEUROLOGY CLINIC, P.C. 4487 N MUSIC LINE 7876 N NEUROLOGY CLINIC, P.C. 5687 N MUSIC LINE 6378 N NEUROLOGY CLINIC, P.C. 6875 R MUSKEGON CHRONICLE 3248 N NEUROLOGY CLINIC, P.C. 4386 R MUSKEGON CHRONICLE 9622 R NEVADA BELL 7792 N M&C MINNESOTA, INC. 4867 R NEVADA BELL 2646 N M&C MINNESOTA, INC. 8256 R NEVADA BELL 7376 N M&C MINNESOTA, INC. 8622 R NEVADA BELL 4429 N M&C MINNESOTA, INC. 3284 R NEVADA BELL 2385 N M&C MINNESOTA, INC. 5765 R NEW ATHENS JOURNAL 6927 N M.J.D. COMMUNICATIONS 9436 R NEW ATHENS JOURNAL 6943 N M.J.D. COMMUNICATIONS 5275 R NEW ATHENS JOURNAL 6933 N M.J.D. COMMUNICATIONS 9872 N NEW MEDIA VENTURES, INC. 6924 N M.J.D. COMMUNICATIONS 7227 N NEW MEDIA VENTURES, INC. 6983 N M.J.D. COMMUNICATIONS 4543 N NEW MEDIA VENTURES, INC. 3938 N M.L.C. COMMUNICATIONS 3667 R NEW-CELL, INC. 3936 N M.L.C. COMMUNICATIONS 9472 R NEW-CELL, INC. 3933 N M.L.C. COMMUNICATIONS 4229 R NEW-CELL, INC. 2672 N M.L.C. COMMUNICATIONS 9663 R NEW-CELL, INC. 6922 N M.L.C. COMMUNICATIONS 7575 R NEWFOUNDLAND TEL 5525 N NAMSON CONSULTING GEOLOGISTS 1313 R NEWFOUNDLAND TEL 5872 N NAMSON CONSULTING GEOLOGISTS 7246 R NEWS TRIBUNE 5879 N NAMSON CONSULTING GEOLOGISTS 4648 R NEWS TRIBUNE 5792 N NAMSON CONSULTING GEOLOGISTS 6500 R NEWS TRIBUNE 2673 N NANCO INTERNATIONAL 5444 N NEWSPAPER NETWORK 6377 N NANCO INTERNATIONAL 1866 N NEWSPAPER NETWORK 8729 N NANCY KAHANE 8661 N NEWSPAPER NETWORK 5375 N NANCY KAHANE 9335 N NEWSWEEK 7887 N NANCY KAHANE 3100 R NEWSWEEKLY 6824 N NANCY KAHANE 4327 R NEWSWEEKLY 3862 N NANCY KAHANE 5452 R NEWSWEEKLY 6828 N NANCY M. JONAS 9918 R NEWSWEEKLY 3587 N NANCY M. JONAS 6333 N NEXUS COMMUNICATIONS, INC. 3338 N NANCY M. JONAS 1727 N NEXUS COMMUNICATIONS, INC. 3682 N NANCY M. JONAS 1762 N NEXUS COMMUNICATIONS, INC. 5692 N NANCY M. JONAS 4282 N NEXUS COMMUNICATIONS, INC. 4878 N NAND CORP. 5657 N NNT 5475 N NAND CORP. 9090 N NNT 4393 N NAND CORP. 7070 N NNT 3323 N NAND CORP. 7272 N NNT 2983 N NAND CORP. 5556 N NNT 7724 N NAT REESE 5283 N NOR CORP. 9623 N NAT REESE 8665 N NOR CORP. 6454 N NAT REESE 4889 N NOR CORP. 2362 N NAT REESE 2726 N NOR CORP. 7298 N NAT REESE 2662 N NOR CORP. 7787 N NATIONWIDE WIRELESS NETWORK 4369 N NORSICAN COMMUNICATIONS, INC. 3378 N NATIONWIDE WIRELESS NETWORK 7659 N NORSICAN COMMUNICATIONS, INC. 3726 N NATL. TELEPHONE ENTERPRISES 9376 N NORTHWEST FARMER-STOCKMAN, INC. 1313 R NB TEL 3276 N NORTHWEST FARMER-STOCKMAN, INC. 7575 R NB TEL 4467 N NORTHWEST FARMER-STOCKMAN, INC. 6386 N NBC, INC. 2333 N NORTHWEST FARMER-STOCKMAN, INC. 5622 N NBC, INC. 4273 N NORTHWEST NEVADA TELCO 6327 N NEBS BUSINESS FORMS LTD. 5472 N NORTHWEST NEVADA TELCO 7888 N NEED COMMUNICATIONS, INC. 5625 N NORTHWEST NEVADA TELCO 1624 N NEED COMMUNICATIONS, INC. 5557 N NORTHWEST NEVADA TELCO

TYPE N - NATIONAL, R - REGIONAL 82 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 6532 R NYNEX-NEW YORK 7666 N PAN & ASSOCIATES 4652 R NYNEX-NEW YORK 6338 N PAN & ASSOCIATES 9727 R NYNEX-NEW YORK 7101 N PARADE PUBLICATIONS 6263 R NYNEX-NEW YORK 7103 N PARADE PUBLICATIONS 1611 R NYNEX/NEW ENGLAND 7102 N PARADE PUBLICATIONS 1515 R NYNEX/NEW ENGLAND 7104 N PARADE PUBLICATIONS 1811 R NYNEX/NEW ENGLAND 7100 N PARADE PUBLICATIONS 1000 R NYNEX/NEW ENGLAND 1000 R PATRIOT-NEWS CO. 1717 R NYNEX/NEW ENGLAND 1234 R PATRIOT-NEWS CO. 6257 N OAK CREEK INFORMATION CORP. 1200 R PATRIOT-NEWS CO. 3567 N OAK CREEK INFORMATION CORP. 3447 N PATTI LOTTERMOSER 6477 N OAK CREEK INFORMATION CORP. 2837 N PATTI LOTTERMOSER 6886 N OAK CREEK INFORMATION CORP. 4399 N PATTI LOTTERMOSER 7273 N OAK CREEK INFORMATION CORP. 6795 N PATTI LOTTERMOSER 8181 R OAKLAND PRESS 7333 N PATTI LOTTERMOSER 5111 R OAKLAND PRESS 9419 N PAUL LOCKWOOD 4327 R OAKLAND PRESS 0924 N PAUL LOCKWOOD 5999 R OAKLAND PRESS 8987 N PAUL LOCKWOOD 5123 R OAKLAND PRESS 9006 N PAUL LOCKWOOD 2358 N O'BRIEN COMMUNICATION SERVICES 2718 N PAUL LOCKWOOD 3797 N O'BRIEN COMMUNICATION SERVICES 7591 N PAUL SIMONS 3987 N O'BRIEN COMMUNICATION SERVICES 7400 N PAUL SIMONS 3743 N O'BRIEN COMMUNICATION SERVICES 2624 N PAUL SIMONS 3855 N O'BRIEN COMMUNICATION SERVICES 4539 N PAUL SIMONS 4015 N OCEAN ATLANTIC COMMUNICATIONS 4873 N PAUL SIMONS 2892 N OCEAN ATLANTIC COMMUNICATIONS 6747 N PAUL SIUDZINSKI 5482 N OCEAN ATLANTIC COMMUNICATIONS 3525 N PAUL SIUDZINSKI 3458 N OCEAN ATLANTIC COMMUNICATIONS 7456 N PAUL SIUDZINSKI 2522 N OCEAN ATLANTIC COMMUNICATIONS 9665 N PAUL SIUDZINSKI 7832 N OCEAN ATLANTIC FINANCIAL INVESTMENT 0001 N PAYLINE SYSTEMS, INC. 8246 N OCEAN ATLANTIC FINANCIAL INVESTMENT 1001 N PAYLINE SYSTEMS, INC. 5642 N OCEAN ATLANTIC FINANCIAL INVESTMENT 6255 R PA. NEWSPAPER PUBLISHERS' ASSN. 7864 N OCEAN ATLANTIC FINANCIAL INVESTMENT 8863 N PCM, INC. 4292 N OCEAN ATLANTIC FINANCIAL INVESTMENT 4877 N PCM, INC. 7764 R O'FALLON PROGRESS 0202 N PCM, INC. 5345 R O'FALLON PROGRESS 7223 N PC-TOTES, INC. 6325 R O'FALLON PROGRESS 6337 N PC-TOTES, INC. 8300 N ONCOR COMMUNICATIONS, INC. 2387 N PC-TOTES, INC. 6700 N ONCOR COMMUNICATIONS, INC. 9990 N PDQ PHONE, INC. 4600 N ONCOR COMMUNICATIONS, INC. 9997 N PDQ PHONE, INC. 2001 N ONCOR COMMUNICATIONS, INC. 9998 N PDQ PHONE, INC. 1999 N ONCOR COMMUNICATIONS, INC. 9996 N PDQ PHONE, INC. 2500 R OREGONIAN PUBLISHING CO. 7936 N PDQ PHONE, INC. 5005 R OREGONIAN PUBLISHING CO. 7823 N PENTA RESOURCES CORP. 1000 R OREGONIAN PUBLISHING CO. 4435 N PENTA RESOURCES CORP. 6774 N ORRIN CHARM 3675 N PENTA RESOURCES CORP. 7656 N ORRIN CHARM 4562 N PENTA RESOURCES CORP. 5269 N ORRIN CHARM 5342 N PENTA RESOURCES CORP. 6244 N ORRIN CHARM 5566 N PEPSICO 6654 N ORRIN CHARM 5522 N PEPSICO 4368 R PACIFIC BELL-NATL. ACCOUNTS 5588 N PEPSICO 4386 R PACIFIC BELL-NATL. ACCOUNTS 5544 N PEPSICO 3476 R PACIFIC BELL-NATL. ACCOUNTS 6459 N PESCADERO COMMUNICATIONS 9248 R PACIFIC BELL-NATL. ACCOUNTS 8265 N PESCADERO COMMUNICATIONS 4667 R PACIFIC BELL-OPERATOR SERVICES 6428 N PESCADERO COMMUNICATIONS 3111 N PACIFIC RIM ADVERTISING 5396 N PESCADERO COMMUNICATIONS 1155 N PACIFIC RIM ADVERTISING 6762 N PESCADERO COMMUNICATIONS 1166 N PACIFIC RIM ADVERTISING 4626 N PHON-E 1050 N PACIFIC RIM ADVERTISING 8587 N PHON-E 5253 N PACIFIC RIM ADVERTISING 6399 N PHONE PROGRAMS, INC. 5252 R PACTEL ELECTRONIC PUBLISHING SVCS. 1133 N PHONE PROGRAMS, INC. 6255 R PACTEL ELECTRONIC PUBLISHING SVCS. 5711 N PHONE PROGRAMS, INC. 7255 R PAGE-ALL, INC. 4227 N PHONE PROGRAMS, INC. 0777 N PAGEMART, INC. 6767 N PHONE PROGRAMS, INC. 7125 N PAGEMART, INC. 7877 N PHONE USA INC. 6625 N PAGEMART, INC. 8487 N PHONE USA INC. 0999 N PAGEMART, INC. 9991 N PILGRIM TELEPHONE, INC. 0888 N PAGEMART, INC. 9992 N PILGRIM TELEPHONE, INC. 8274 N PALM BEACH COMMUNICATIONS 9994 N PILGRIM TELEPHONE, INC. 7329 N PALM BEACH COMMUNICATIONS 9993 N PILGRIM TELEPHONE, INC. 7428 N PALM BEACH COMMUNICATIONS 9995 N PILGRIM TELEPHONE, INC. 7282 N PALM BEACH COMMUNICATIONS 7768 R PINCKNEYVILLE DEMOCRAT 5742 N PALM BEACH COMMUNICATIONS 7845 R PINCKNEYVILLE DEMOCRAT

TYPE N - NATIONAL, R - REGIONAL 83 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 7465 R PINCKNEYVILLE DEMOCRAT 6224 N RAY-TEL, INC. 7379 R PINCKNEYVILLE DEMOCRAT 5484 N RAY-TEL, INC. 2703 R PLAIN DEALER PUBLISHING CO. 5387 N RAY-TEL, INC. 2702 R PLAIN DEALER PUBLISHING CO. 0211 N RCI LONG DISTANCE NEW ENGLAND 2705 R PLAIN DEALER PUBLISHING CO. 3425 N RCI LONG DISTANCE NEW ENGLAND 2704 R PLAIN DEALER PUBLISHING CO. 1122 N RCI LONG DISTANCE NEW ENGLAND 2701 R PLAIN DEALER PUBLISHING CO. 4568 N RCI LONG DISTANCE NEW ENGLAND 6268 N PLANDOME COMMUNICATIONS 8900 N RCI LONG DISTANCE, INC. 2377 N PLANDOME COMMUNICATIONS 9876 N RCI LONG DISTANCE, INC. 2364 N PLANDOME COMMUNICATIONS 8080 N RCI LONG DISTANCE, INC. 6264 N PLANDOME COMMUNICATIONS 1379 N RCI LONG DISTANCE, INC. 5844 N PLANDOME COMMUNICATIONS 2468 N RCI LONG DISTANCE, INC. 4527 N PORTLAND INFORMATION SERVICES 5325 N RDC TELEMANAGEMENT, INC. 3784 N PORTLAND INFORMATION SERVICES 3924 N RDC TELEMANAGEMENT, INC. 3836 N PORTLAND INFORMATION SERVICES 3566 N RDC TELEMANAGEMENT, INC. 0261 R POST-NEWSWEEK CABLE 3674 N RDC TELEMANAGEMENT, INC. 2288 N POST-NEWSWEEK CABLE 2375 N RDC TELEMANAGEMENT, INC. 2225 N POST-NEWSWEEK CABLE 7874 N READY CALL, INC. 5772 R POST-NEWSWEEK STATIONS HOUSTON 4322 N READY CALL, INC. 9372 R POST-NEWSWEEK STATIONS-CT., INC. 0404 N REBECCA SHAPIRO 9348 R POST-NEWSWEEK STATIONS, MICHIGAN 6161 N REBECCA SHAPIRO 9598 R POST-NEWSWEEK STAT. - FLORIDA, INC. 6363 N REBECCA SHAPIRO 9754 R POST-NEWSWEEK STAT. - FLORIDA, INC. 4343 N REBECCA SHAPIRO 1010 R POST-NEWSWEEK STAT. - FLORIDA, INC. 0303 N REBECCA SHAPIRO 8812 R POST-NEWSWEEK STAT. - SAN ANTONIO 7655 R REMINDER NEWSPAPERS 5728 R POST-NEWSWEEK STAT. - SAN ANTONIO 2843 R REMINDER NEWSPAPERS 7863 N POTOMAC TELESERVICES 4505 N RENEGADE SOFTWARE, INC. 8636 N POTOMAC TELESERVICES 6253 N RENEGADE SOFTWARE, INC. 8775 N POTOMAC TELESERVICES 7788 N REVENUE CANADA 8736 N POTOMAC TELESERVICES 1967 N REVENUE CANADA 8674 N POTOMAC TELESERVICES 6677 N REVENUE CANADA 3939 N PRO SAFE CORPORATION OF AMERICA 1867 N REVENUE CANADA 3334 N PRO SAFE CORPORATION OF AMERICA 1995 N REVENUE CANADA 3298 N PRO SAFE CORPORATION OF AMERICA 4674 N RGM COMMSTAR 4658 N PRO SAFE CORPORATION OF AMERICA 4732 N RGM COMMSTAR 3727 N PRO SAFE CORPORATION OF AMERICA 2374 N RGM COMMSTAR 4532 N PRODUCT VENTURE SERVICES, INC. 4735 N RGM COMMSTAR 8735 N PRODUCT VENTURE SERVICES, INC. 7224 N RGM COMMSTAR 3825 N PROMOLINE, INC. 4934 N RICHARD A. STONE 4475 N PROMOLINE, INC. 6234 N RICHARD A. STONE 1333 N PTI COMMUNICATIONS 0270 N RICHARD A. STONE 8975 N PTI COMMUNICATIONS 1989 N RICHARD A. STONE 5232 R QUALICOM 8189 N RICHARD A. STONE 8700 R QUALICOM 5456 N RICHARD JOHNSON MARKETING 7600 N QUATERRA COMMUNICATIONS CORP. 5759 N RICHARD JOHNSON MARKETING 9330 N QUATERRA COMMUNICATIONS CORP. 5852 N RICHARD JOHNSON MARKETING 5515 N QUATERRA COMMUNICATIONS CORP. 5258 N RICHARD JOHNSON MARKETING 4483 N RAFFERTY ASSOCIATES 5654 N RICHARD JOHNSON MARKETING 3787 N RAFFERTY ASSOCIATES 6659 N RICHARD LEVINE 6837 N RAFFERTY, INC. 2564 N RICHARD LEVINE 1996 R RAFFERTY, INC. 6536 N RICHARD LEVINE 6392 N RAK COMMUNICATIONS, INC. 6256 N RICHARD LEVINE 8466 N RAK COMMUNICATIONS, INC. 6836 N RICHARD LEVINE 8797 N RAK COMMUNICATIONS, INC. 2327 R RICHARD S. BELL 8794 N RAK COMMUNICATIONS, INC. 2827 R RICHARD S. BELL 8632 N RAK COMMUNICATIONS, INC. 4295 R RICHARD S. BELL 5284 N RALEIGH TELECOM CORP. 2855 R RICHARD S. BELL 5227 N RALEIGH TELECOM CORP. 9769 R RICHARD S. BELL 4448 N RALEIGH TELECOM CORP. 7453 N RISK VENTURE SERVICES, INC. 5632 N RALEIGH TELECOM CORP. 7454 N RISK VENTURE SERVICES, INC. 4339 N RALEIGH TELECOM CORP. 2258 N RITA DUSSEAU 4425 N RAMBLEWOOD COMMUNICATIONS 2326 N RITA DUSSEAU 8247 N RAMBLEWOOD COMMUNICATIONS 7824 N RITA DUSSEAU 4848 N RAMBLEWOOD COMMUNICATIONS 4342 N RITA DUSSEAU 6878 N RAMBLEWOOD COMMUNICATIONS 4669 N RITA DUSSEAU 2467 N RAMBLEWOOD COMMUNICATIONS 6646 N RITCHFIELD TELCOM SERVICES 2554 N RANDOM ACCESS CORP. 3888 N RITCHFIELD TELCOM SERVICES 2542 N RANDOM ACCESS CORP. 3465 N RITCHFIELD TELCOM SERVICES 3662 N RANDOM ACCESS CORP. 6298 N RITCHFIELD TELCOM SERVICES 4729 N RANDOM ACCESS CORP. 6444 N RITCHFIELD TELCOM SERVICES 7837 N RANDOM ACCESS CORP. 2433 N ROBERT A. BLAISCH 8398 N RANDOM HOUSE 6555 N ROBERT A. BLAISCH 6636 N RAPMIL CORPORATION 3676 N ROBERT A. BLAISCH 7499 N RAPMIL CORPORATION 6722 N ROBERT A. BLAISCH 3555 N RAPMIL CORPORATION 0722 N ROBERT A. BLAISCH 2463 N RAPMIL CORPORATION 8657 N ROBERT G. DREHER 2849 N RAPMIL CORPORATION 6434 N ROBERT G. DREHER 6452 N RAY-TEL, INC. 8275 N ROBERT G. DREHER 5278 N RAY-TEL, INC. 8568 N ROBERT G. DREHER

TYPE N - NATIONAL, R - REGIONAL 84 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 8327 N ROBERT G. DREHER 6724 N SGR NETWORK SERVICES 3644 N ROBERT N. MARKHAM 6726 N SGR NETWORK SERVICES 5237 N ROBERT N. MARKHAM 9462 N SGR NETWORK SERVICES 6433 N ROBERT N. MARKHAM 6478 N SGR NETWORK SERVICES 7375 N ROBERT N. MARKHAM 6694 N SGR NETWORK SERVICES 6258 N ROBERT N. MARKHAM 7433 N SHARE A RIDE INTERNATIONAL, INC. 7423 N ROB-TEL SERVICES 7665 N SHARE A RIDE INTERNATIONAL, INC. 5382 N ROB-TEL SERVICES 7623 N SHARE A RIDE INTERNATIONAL, INC. 6223 N ROB-TEL SERVICES 7742 N SHARON WEISS 5434 N ROB-TEL SERVICES 2679 N SIDNEY LEVINSOHN 3657 N ROB-TEL SERVICES 6973 N SIDNEY LEVINSOHN 6739 N ROCK-TEL COMMUNICATIONS 8946 N SIDNEY LEVINSOHN 8695 N ROCK-TEL COMMUNICATIONS 6236 N SILVERSTONE COMMUNICATIONS 6526 N ROCK-TEL COMMUNICATIONS 2822 N SINNAMON PR0DUCTIONS 6975 N ROCK-TEL COMMUNICATIONS 2878 N SINNAMON PR0DUCTIONS 8486 N ROCK-TEL COMMUNICATIONS 4825 N SINNAMON PR0DUCTIONS 9687 N ROZAR ASSOCIATES 8737 N SKYTEL CORPORATION 7847 N RWH INFORMATION CORP. 7296 R SMR SYSTEMS, INC. 4333 N RWH INFORMATION CORP. 7848 N SNOMIS CORP. 2432 N RWH INFORMATION CORP. 4866 N SNOMIS CORP. 2925 N RWH INFORMATION CORP. 2784 N SNOMIS CORP. 2695 N RWH INFORMATION CORP. 4366 N SNOMIS CORP. 6273 N R.P.W. COMMUNICATIONS 2993 N SNOMIS CORP. 6352 N R.P.W. COMMUNICATIONS 7654 N SNOWMASS COMMUNICATIONS 7385 N R.P.W. COMMUNICATIONS 3383 N SNOWMASS COMMUNICATIONS 6353 N R.P.W. COMMUNICATIONS 5697 N SNOWMASS COMMUNICATIONS 3876 N SAM HAIM 5693 N SNOWMASS COMMUNICATIONS 2663 N SAM HAIM 6242 N SNOWMASS COMMUNICATIONS 2632 N SAM HAIM 5823 N SOFT PRODUCTS, INC. 7862 N SAM HAIM 7377 N SOFT PRODUCTS, INC. 9639 N SAN DIEGO TELE-SERVICES 8299 N SOTIRIOS ASSOC. 7386 N SAN DIEGO TELE-SERVICES 5265 N SOTIRIOS ASSOC. 9004 N SAN DIEGO TELE-SERVICES 7526 N SOTIRIOS ASSOC. 5532 N SAN DIEGO TELE-SERVICES 3368 N SOURCE 4764 N SAN DIEGO TELE-SERVICES 3628 N SOURCE 3355 N SAN MARCOS LONG DISTANCE 3627 N SOURCE 3339 N SAN MARCOS LONG DISTANCE 4676 R SOUTHAM INC. 7858 N SANDRA SPANG 1234 R SOUTHAM INC. 8505 N SANDRA SPANG 6999 R SOUTHAM INC. 5962 N SANDRA SPANG 3442 N SOUTHWESTERN BELL - TEXAS 2292 N SANDRA SPANG 4652 R SOUTHWESTERN BELL - TEXAS 7854 N SANDRA SPANG 6458 N SOUTHWESTERN BELL-ST. LOUIS 2381 N SANTA FE NEW MEXICAN 7928 R SOUTHWESTERN BELL-ST. LOUIS 4681 N SANTA FE NEW MEXICAN 1234 R SOUTHWESTERN BELL-ST. LOUIS 2781 N SANTA FE NEW MEXICAN 2286 N SPARKS COMMUNICATIONS 3947 N SANTA FE NEW MEXICAN 2772 N SPARKS COMMUNICATIONS 6639 N SANTA FE NEW MEXICAN 6396 N SPARKS COMMUNICATIONS 8446 N SARAH O. MONTGOMERY 2237 N SPARKS COMMUNICATIONS 4862 N SARAH SACHS 4285 N SPARKS COMMUNICATIONS 4887 N SARAH SACHS 9268 R SPARTA NEWS PLAINDEALER 3948 N SARAH SACHS 3325 R SPARTA NEWS PLAINDEALER 4255 N SARAH SACHS 1845 R SPARTA NEWS PLAINDEALER 4355 N SARAH SACHS 7335 R SPARTA NEWS PLAINDEALER 7275 N SASKTEL 3272 N SPRINT COMMUNICATIONS 7575 R SASKTEL 2487 N SPRINT COMMUNICATIONS 1313 R SASKTEL 2778 N SPRINT LOCAL TELECOM DIVISION 5757 N SCHERERS COMMUNICATIONS 2854 N SR TELECOM SERVICES 7800 N SCHERERS COMMUNICATIONS 3497 N SR TELECOM SERVICES 6868 N SCHERERS COMMUNICATIONS 2789 N SR TELECOM SERVICES 2300 N SCHERERS COMMUNICATIONS 2876 N SR TELECOM SERVICES 4545 N SCHERERS COMMUNICATIONS 2785 N SR TELECOM SERVICES 3268 N SEATTLE-COM L.L.C. 7646 N STANLEY H. KAPLAN EDUCATION CTR. 5226 N SEATTLE-COM L.L.C. 8378 N STANLEY H. KAPLAN EDUCATION CTR. 6465 N SEATTLE-COM L.L.C. 5271 N STANLEY H. KAPLAN EDUCATION CTR. 3968 N SEATTLE-COM L.L.C. 7737 N STANLEY H. KAPLAN EDUCATION CTR. 5898 N SEATTLE-COM L.L.C. 2880 N STANLEY SHAPIRO 6262 N SEAWYF, INC. 9797 N STANLEY SHAPIRO 5836 N SEAWYF, INC. 2055 N STANLEY SHAPIRO 5838 N SEAWYF, INC. 7023 N STANLEY SHAPIRO 5455 N SEAWYF, INC. 2798 N STANLEY SHAPIRO 2479 N SEAWYF, INC. 5546 N STARMAGIC MEDIA SERVICES 2689 R SEDGEWICK COUNTY INFO. SERVICES 1980 N STARMAGIC MEDIA SERVICES 7426 R SEDGEWICK COUNTY INFO. SERVICES 1990 N STARMAGIC MEDIA SERVICES 7247 R SEDGEWICK COUNTY INFO. SERVICES 5115 N STARMAGIC MEDIA SERVICES 3863 N SEICOMM INFORMATION SERVICES 2686 N STARMAGIC MEDIA SERVICES 7353 N SELF MAGAZINE 3932 R STAR-TELEGRAM OPERATING, LTD. 3574 N SELF MAGAZINE 7898 R STAR-TELEGRAM OPERATING, LTD. 6463 N SELF MAGAZINE 7839 R STAR-TELEGRAM OPERATING, LTD. 3488 N SELF MAGAZINE 5559 N STATE OF NEVADA

TYPE N - NATIONAL, R - REGIONAL 85 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 4777 N STATE OF NEVADA 2767 N TANGLEWOOD COMMUNICATION SVCS. 3331 N STATE OF NEVADA 3782 N TANGLEWOOD COMMUNICATION SVCS. 6777 N STATE OF NEVADA 3295 N TANGLEWOOD COMMUNICATION SVCS. 6467 N STELLA WEISS 4268 N TARGET REALTY 5477 N STELLA WEISS 8352 N TARGET REALTY 3453 N STELLA WEISS 4839 N TARGET REALTY 3665 N STELLA WEISS 4238 N TARGET REALTY 4524 N STEPHEN SMITH 5478 R TARGET REALTY 7332 N STEPHEN SMITH 8292 N TAS ENTERPRISES 1879 N STEPHEN SMITH 6596 N TAS ENTERPRISES 6274 N STEPHEN SMITH 9321 N TAS ENTERPRISES 2739 N STEVEN D. MONTGOMERY 8854 N TAS ENTERPRISES 4721 N STEVEN D. MONTGOMERY 3593 N TAS ENTERPRISES 5384 N STEVEN D. MONTGOMERY 6389 N TAS INDUSTRIES 2762 N STEVEN R. KATZ 8865 N TAS INDUSTRIES 2844 N STEVEN R. KATZ 6385 N TAS INDUSTRIES 4272 N STEVEN R. KATZ 8864 N TAS INDUSTRIES 7673 N STONEBRAKER & WILSON, INC. 1700 R TEK COMMUNICATIONS, INC. 2628 N STONEBRAKER & WILSON, INC. 1600 R TEK COMMUNICATIONS, INC. 3865 N STREET & SMITH'S 1900 R TEK COMMUNICATIONS, INC. 7277 N STREET & SMITH'S 1800 R TEK COMMUNICATIONS, INC. 5425 N STREET & SMITH'S 6476 N TELCO PLANNING 3874 N STREET & SMITH'S 4221 N TELCO PLANNING 7867 N STREET & SMITH'S 4372 N TELCO PLANNING 1502 R ST. FRANCIS REGIONAL MEDICAL CENTER 6858 N TELCO PLANNING 1504 R ST. FRANCIS REGIONAL MEDICAL CENTER 8726 N TELCO PLANNING 1501 R ST. FRANCIS REGIONAL MEDICAL CENTER 0555 N TELECENTER INC. 1503 R ST. FRANCIS REGIONAL MEDICAL CENTER 9467 N TELECOM TECHNOLOGIES 1505 R ST. FRANCIS REGIONAL MEDICAL CENTER 5398 N TELECOM TECHNOLOGIES 8862 N SUMMERHILL ENTERPRISES 9800 R TELECOMPUTE CORPORATION 8861 N SUMMERHILL ENTERPRISES 6282 N TELECOMPUTE CORPORATION 8867 N SUMMERHILL ENTERPRISES 9300 N TELECOMPUTE CORPORATION 8860 N SUMMERHILL ENTERPRISES 8000 R TELE-DIRECT PUBLICATIONS 8868 N SUMMERHILL ENTERPRISES 9747 N TELE-DIRECT PUBLICATIONS 9461 N SUMMERHILL VENTURES, INC. 3937 N TELEDONTICS, INC. 4332 N SUMMERHILL VENTURES, INC. 2229 N TELEDONTICS, INC. 3494 N SUMMERHILL VENTURES, INC. 3273 N TELEFARE COMMUNICATIONS, INC. 6725 N SUMMERHILL VENTURES, INC. 2437 N TELEHEALTH SERVICES, INC. 8291 N SUMMERHILL VENTURES, INC. 4683 N TELEHOTEL ENTERPRISES, INC. 8785 N SUMMIT COMMUNICATIONS 5653 N TELEJOKE SERVICES, INC. 1949 N SUMMIT COMMUNICATIONS 4253 N TELE-LAWYER, INC. 2392 N SUMMIT COMMUNICATIONS 2030 N TELEMATION INTERNATIONAL 6460 N SUMMIT COMMUNICATIONS 8600 N TELEMATION INTERNATIONAL 7814 N SUMMIT COMMUNICATIONS 6100 N TELEMATION INTERNATIONAL 9773 N SUSAN DELETTERA 6300 N TELEMATION INTERNATIONAL 9736 N SUSAN DELETTERA 8400 N TELEMATION INTERNATIONAL 9642 N SUSAN DELETTERA 3678 N TELEPHONE BROADCASTING SYSTEMS 9766 N SUSAN DELETTERA 2800 N TELEPHONE BROADCASTING SYSTEMS 9475 N SUSAN DELETTERA 3655 N TELEPHONE BROADCASTING SYSTEMS 3259 N SUSAN M. STONE 7245 N TELERAIL SERVICES, INC. 7957 N SUSAN M. STONE 4737 N TELEREP, INC. 6006 N SUSAN M. STONE 4897 N TELESERVE, INC. 8389 N SUSAN M. STONE 6366 N TELESERVE, INC. 5254 N SUSAN M. STONE 4367 N TELESERVE, INC. 2775 N SYLVIA BLAISCH 6266 N TELESERVE, INC. 5288 N SYLVIA BLAISCH 8294 N TELETAXI SERVICES INC. 5272 N SYLVIA BLAISCH 2100 N TELETEL 5877 N SYLVIA BLAISCH 3030 N TELETEL 6394 N SYLVIA BLAISCH 7473 N TELETEL 2020 N SYNCRONET, INC. 0505 N TELETEL 4468 N SYNCRONET, INC. 9253 N TELEWAKE SERVICES, INC. 2400 N SYNCRONET, INC. 4225 N TELPLEX INTERNATIONAL LLC 1555 N SYRACUSE NEWSPAPER 2836 N TELPLEX INTERNATIONAL LLC 0011 N SYRACUSE NEWSPAPER 2667 N TERATECH, INC. 2111 N SYRACUSE NEWSPAPER 3475 N TERATECH, INC. 4141 N SYRACUSE NEWSPAPER 6453 N TERATECH, INC. 3737 N SYRACUSE NEWSPAPER 7663 N TERRIAN CORP. 3669 N T & J INFORMATION 2845 N TERRIAN CORP. 8222 N T & J INFORMATION 5296 N TERRIAN CORP. 3935 N T & J INFORMATION 8453 N TERRIAN CORP. 2245 N T & J INFORMATION 2869 N TERRIAN CORP. 5393 N T & J INFORMATION 3329 N TERRIE GILPIN 5945 N TAKEOUT TAXI HOLDINGS, INC. 4829 N TETHRA CORP. 1868 N TAKEOUT TAXI HOLDINGS, INC. 2967 N TETHRA CORP. 1328 N TAKEOUT TAXI HOLDINGS, INC. 3362 N TETHRA CORP. 9266 N TAKEOUT TAXI HOLDINGS, INC. 2267 N TETHRA CORP. 1357 N TAKEOUT TAXI HOLDINGS, INC. 4738 N TETHRA CORP. 5282 N TANGLEWOOD COMMUNICATION SVCS. 3583 R TEXAS MEDICAL PAGING 2797 N TANGLEWOOD COMMUNICATION SVCS. 7387 R TEXAS MEDICAL PAGING

TYPE N - NATIONAL, R - REGIONAL 86 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO LINE NO. TYPE ASSIGNED TO 5875 R TEXAS MEDICAL PAGING 0014 N US NETWORK SERVICES 9877 N THELMA NELLES 1234 R US WEST 2568 N THELMA NELLES 4652 R US WEST COMMUNICATIONS 8277 N THELMA NELLES 7378 R US WEST COMMUNICATIONS 6889 N THELMA NELLES 2262 N US WEST MARKETING RESOURCES 6867 N THELMA NELLES 9359 N US WEST MARKETING RESOURCES 1892 N THIRD STREET CHATTER 3748 N US WEST MARKETING RESOURCES 4265 N THIRD STREET CHATTER 8999 N US WEST MARKETING RESOURCES 1688 N THIRD STREET CHATTER 8792 R US WEST NEW VECTOR GROUP 1266 N THIRD STREET CHATTER 3868 R US WEST NEW VECTOR GROUP 1622 N THIRD STREET CHATTER 9468 N VALERIE ERVIN 6289 N THOMAS J. HUGHES, III 9484 N VALERIE ERVIN 8722 N THOMAS J. HUGHES, III 9748 N VALERIE ERVIN 2666 N THOMAS J. HUGHES, III 9644 N VALERIE ERVIN 2748 N THOMAS J. HUGHES, III 8953 N VALERIE ERVIN 8336 N THOMAS J. HUGHES, III 3247 N VANITY FAIR 6278 R TIME WARNER COMMUNICATIONS 8383 N VANITY FAIR 3833 R TIME WARNER COMMUNICATIONS 5423 N VIRGINIA BEACH COMMUNICATIONS CORP. 2263 R TIME WARNER COMMUNICATIONS 7622 N VIRGINIA BEACH COMMUNICATIONS CORP. 8980 R TIME WARNER TELECOMMUNICATIONS 8643 N VIRGINIA BEACH COMMUNICATIONS CORP. 7270 N TIME WARNER TELECOMMUNICATIONS 3672 N VIRGINIA BEACH COMMUNICATIONS CORP. 5323 R TIMES LEADER 4287 N VIRGINIA BEACH COMMUNICATIONS CORP. 3524 N TIMES LEADER 7738 N VISUAL RADIO 7266 R TIMES OF TRENTON PUBLISHING CORP. 8439 N VOGUE 6910 R TIMES OF TRENTON PUBLISHING CORP. 3343 N VOGUE 2500 R TIMES-PICAYUNE PUBLISHING CORP. 2442 N VOGUE 3500 R TIMES-PICAYUNE PUBLISHING CORP. 9327 N VOGUE 6500 R TIMES-PICAYUNE PUBLISHING CORP. 5893 N VOGUE 4500 R TIMES-PICAYUNE PUBLISHING CORP. 8725 N VOICE INFO, SVCS., INC. 7500 R TIMES-PICAYUNE PUBLISHING CORP. 1996 R VOICE INFO, SVCS., INC. 6400 N TODAY'S HOMES 8863 N VOICES FROM HOME, INC. 8200 N TODAY'S HOMES 8642 N VOICES FROM HOME, INC. 6800 N TODAY'S HOMES 6647 N VOX SERVICES, INC. 6200 N TODAY'S HOMES 5386 R VOX-TEL 2746 N TOP LINE RESOURCES 7696 R WABC-TV 7427 N TOP LINE RESOURCES 7639 R WABC-TV 4744 N TOP LINE RESOURCES 9222 R WABC-TV 4711 N TOP LINE RESOURCES 5427 N WALTER MALAKOFF 8226 N TOP LINE RESOURCES 5863 N WALTER MALAKOFF 1010 R TORONTO STAR 6296 N WALTER MALAKOFF 1000 R TORONTO STAR 5883 N WALTER MALAKOFF 6942 N TOUCH PHONE PRODUCTIONS, INC. 5927 N WALTER MALAKOFF 2569 N TOUCH PHONE PRODUCTIONS, INC. 7799 N WARREN JASON 8542 N TOUCH PHONE PRODUCTIONS, INC. 8663 N WARREN JASON 2888 N TOUCH PHONE PRODUCTIONS, INC. 1177 N WARREN JASON 1234 R TRI-CITY HERALD 5344 N WASHINGTON POST COMPANY 6789 R TRI-CITY HERALD 7678 N WASHINGTON POST COMPANY 4841 N TUNA CORP. 4455 N WASHINGTON POST COMPANY 9258 N TUNA CORP. 7347 N WASHINGTON POST COMPANY 8229 N TUNA CORP. 6354 N WATERFRONT COMMUNICATIONS 3275 N TUNA CORP. 6358 N WATERFRONT COMMUNICATIONS 1834 N TZS CORP. 6357 N WATERFRONT COMMUNICATIONS 4472 N TZS CORP. 6356 N WATERFRONT COMMUNICATIONS 2482 N TZS CORP. 6355 N WATERFRONT COMMUNICATIONS 2276 N TZS CORP. 9566 R WATERLOO REPUBLIC-TIMES 7287 N TZS CORP. 6676 R WATERLOO REPUBLIC-TIMES 2524 N T.C.R. COMMUNICATIONS L.L.C. 9428 R WATERLOO REPUBLIC-TIMES 2226 N T.C.R. COMMUNICATIONS L.L.C. 2478 N WAYLAND COMMUNICATIONS 2546 N T.C.R. COMMUNICATIONS L.L.C. 2835 N WAYLAND COMMUNICATIONS 3533 N T.C.R. COMMUNICATIONS L.L.C. 3492 N WAYLAND COMMUNICATIONS 2684 N T.C.R. COMMUNICATIONS L.L.C. 2839 N WAYLAND COMMUNICATIONS 8686 N T.L. TELE-SERVICES 2964 N WAYLAND COMMUNICATIONS 7542 N T.L. TELE-SERVICES 6387 N WAYNE M. HAMMERLY 7745 N T.L. TELE-SERVICES 7472 N WAYNE M. HAMMERLY 6934 N T.L. TELE-SERVICES 7833 N WAYNE M. HAMMERLY 4538 N UNASOURCE MARKETING GROUP 9597 N WAYNE M. HAMMERLY 2529 N UNASOURCE MARKETING GROUP 9265 N WAYNE M. HAMMERLY 2488 N UNASOURCE MARKETING GROUP 9254 R WCKG, INC. 7373 N UNASOURCE MARKETING GROUP 9979 R WCKG, INC. 8667 N UNASOURCE MARKETING GROUP 1079 R WCKG, INC. 3673 N UNICOM CORPORATION 1059 R WCKG, INC. 1860 R UNION NEWS & SUNDAY REPUBLICAN 9331 N WEDDINGFONE, INC. 1234 R UNION NEWS & SUNDAY REPUBLICAN 8727 N WEDDINGFONE, INC. 1300 R UNION NEWS & SUNDAY REPUBLICAN 3642 N WEDDINGFONE, INC. 1200 R UNION NEWS & SUNDAY REPUBLICAN 2933 N WEDDINGFONE, INC. 0012 N US NETWORK SERVICES 3527 N WEDDINGFONE, INC. 0013 N US NETWORK SERVICES 7399 N WEPS, INC. 4747 N US NETWORK SERVICES 5777 N WESLEY MEDICAL CENTER 0010 N US NETWORK SERVICES 7878 N WESLEY MEDICAL CENTER

TYPE N - NATIONAL, R - REGIONAL 87 TABLE 13 LIST OF 555 LINE NUMBER ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

LINE NO. TYPE ASSIGNED TO 3020 N WESLEY MEDICAL CENTER 3579 N WESLEY MEDICAL CENTER 3050 N WESLEY MEDICAL CENTER 9388 R WFTV, INC. 9446 R WHIO, INC. 1290 R WHIO, INC. 5991 R WHIO, INC. 7338 N WHOLE EARTH GREEN PAGES 7444 N WHOLE EARTH GREEN PAGES 5551 N WHOLE EARTH GREEN PAGES 1963 R WHYT-FM 5267 R WHYT-FM 9696 R WHYT-FM 1211 N WHYT-FM 6789 R WICHITA EAGLE & BEACON PUBLISHING 8000 R WICHITA EAGLE & BEACON PUBLISHING 5298 N WILL KAHANE 1529 N WILL KAHANE 5295 N WILL KAHANE 1842 N WILL KAHANE 8296 N WILTEL 8297 N WILTEL 9638 N WILTEL 8295 N WILTEL 1051 R WIOD, INC. 6102 R WIOD, INC. 9352 R WIOD, INC. 2366 N WIRELESS ONE NETWORK 8743 R WJR -DIV. OF CAPITAL CITIES/ABC, INC. 8745 R WJR -DIV. OF CAPITAL CITIES/ABC, INC. 8744 R WJR -DIV. OF CAPITAL CITIES/ABC, INC. 0957 N WJR -DIV. OF CAPITAL CITIES/ABC, INC. 2242 N WM. HARDASH COMMUNICATIONS 4843 N WM. HARDASH COMMUNICATIONS 6888 N WM. HARDASH COMMUNICATIONS 4813 N WM. HARDASH COMMUNICATIONS 3624 N WM. HARDASH COMMUNICATIONS 9386 N W-O TELCOM SERVICES, INC. 9385 N W-O TELCOM SERVICES, INC. 9384 N W-O TELCOM SERVICES, INC. 9383 N W-O TELCOM SERVICES, INC. 9382 N W-O TELCOM SERVICES, INC. 9587 N WORD OF MOUTH ADVERTISING 6962 N WORD OF MOUTH ADVERTISING 2053 N WORD OF MOUTH ADVERTISING 2003 N WORD OF MOUTH ADVERTISING 2747 N WORLD WIDE NETWORKS 3742 N WORLD WIDE NETWORKS 9794 R WPXI, INC. 2985 R WSB, INC. 1041 R WSB, INC. 9723 R WSB, INC. 9722 R WSB, INC. 7502 R WSB, INC. 9762 R WSOC TELEVISION, INC. 6211 R WTVD/CHANNEL 11 6299 R WTVD/CHANNEL 11 9883 R WTVD/CHANNEL 11 6202 R WWRM, INC. 9786 R WWRM, INC. 9276 R WWRM, INC. 1073 R WWRM, INC. 9263 R WWRM, INC. 8322 N YACHT FUND COMMUNICATIONS 7872 N YACHT FUND COMMUNICATIONS 8478 N YACHT FUND COMMUNICATIONS 9345 N YACHT FUND COMMUNICATIONS 8363 N YACHT FUND COMMUNICATIONS 4766 N YGBK CORPORATION 8769 N YGBK CORPORATION 8252 N YGBK CORPORATION 7437 N YGBK CORPORATION 6626 N YGBK CORPORATION 2692 N ZASSODA ENTERPRISES 8342 N ZASSODA ENTERPRISES 7053 N ZASSODA ENTERPRISES 7956 N ZOOM VIDEO PRODUCTIONS 6687 N ZOOM VIDEO PRODUCTIONS 3687 N ZOOM VIDEO PRODUCTIONS

TYPE N - NATIONAL, R - REGIONAL 88 TABLE 14 TELEPHONE NUMBERS ASSIGNED FOR 800 SERVICE (REPORTED AT THE END OF THE MONTH SHOWN)

WORKING MISC* TOTAL SPARE 800 YEAR MONTH 800 800 800 NUMBERS NUMBERS NUMBERS NUMBERS STILL ASSIGNED AVAILABLE

1993 APRIL 2,448,985 642,725 3,091,710 4,618,290 MAY 2,511,933 708,192 3,220,125 4,489,875 JUNE 2,589,123 722,006 3,311,129 4,398,871 JULY 2,675,483 705,416 3,380,899 4,329,101 AUGUST 2,738,259 701,009 3,439,268 4,270,732 SEPTEMBER 2,818,262 639,547 3,457,809 4,252,191 OCTOBER 2,891,994 660,544 3,552,538 4,157,462 NOVEMBER 3,083,250 728,514 3,811,764 3,898,236 DECEMBER 3,155,955 731,438 3,887,393 3,822,607

1994 JANUARY 3,257,540 580,216 3,837,756 3,872,244 FEBRUARY 3,381,646 731,005 4,112,651 3,597,349 MARCH 3,516,620 743,813 4,260,433 3,449,567 APRIL 3,659,129 699,212 4,358,341 3,351,659 MAY 3,793,865 738,767 4,532,632 3,177,368 JUNE 3,933,037 792,698 4,725,735 2,984,265 JULY 4,099,174 699,803 4,798,977 2,911,023 AUGUST 4,312,486 807,881 5,120,367 2,589,633 SEPTEMBER 4,506,014 841,381 5,347,395 2,362,605 OCTOBER 4,611,014 871,684 5,482,698 2,227,302 NOVEMBER 4,817,854 875,416 5,693,270 2,016,730 DECEMBER 4,948,605 763,235 5,711,840 1,998,160

1995 JANUARY 5,096,646 807,294 5,903,940 1,806,060 FEBRUARY 5,278,800 811,221 6,090,021 1,619,979 MARCH 5,528,723 793,771 6,322,494 1,387,506 APRIL 5,741,780 797,902 6,539,682 1,170,318 MAY 5,980,848 843,093 6,823,941 886,059 JUNE 6,340,534 481,633 6,822,167 887,833 JULY 6,402,785 443,717 6,846,502 863,498 AUGUST 6,428,120 442,270 6,870,390 839,610 SEPTEMBER 6,503,018 437,215 6,940,233 769,767 OCTOBER 6,583,344 396,605 6,979,949 730,051 NOVEMBER 6,647,880 310,043 6,957,923 752,077 DECEMBER 6,700,576 286,487 6,987,063 722,937

1996 JANUARY 6,766,607 297,001 7,063,608 646,392 FEBRUARY 6,861,093 335,557 7,196,650 513,350 MARCH 6,907,098 293,244 7,200,342 509,658 APRIL 6,934,085 280,927 7,215,012 494,988 MAY 6,943,620 333,140 7,276,760 433,240 JUNE 6,986,821 324,899 7,311,720 398,280 JULY 7,022,309 339,900 7,362,209 347,791 AUGUST 7,074,772 311,273 7,386,045 323,955 SEPTEMBER 7,119,167 310,562 7,429,729 280,271 OCTOBER 7,185,135 325,088 7,510,223 199,777 NOVEMBER 7,242,377 337,502 7,579,879 130,121 DECEMBER 7,272,819 343,905 7,616,724 93,276

1997 JANUARY 7,333,632 323,804 7,657,436 52,564 FEBRUARY 7,388,696 318,571 7,707,267 2,733 MARCH 7,402,769 305,362 7,708,131 1,869 APRIL 7,411,118 296,925 7,708,043 1,957

* MISCELLANEOUS NUMBERS INCLUDE THOSE IN THE 800 SERVICE MANAGEMENT SYSTEM MAINTAINED BY DSMI AND CATEGORIZED AS RESERVED, ASSIGNED BUT NOT YET ACTIVATED, RECENTLY DISCONNECTED, OR SUSPENDED.

89 TABLE 15 TELEPHONE NUMBERS ASSIGNED FOR 888 SERVICE (REPORTED AT THE END OF THE MONTH SHOWN)

WORKING MISC* TOTAL SPARE 888 YEAR MONTH 888 888 888 NUMBERS NUMBERS NUMBERS NUMBERS STILL ASSIGNED AVAILABLE

1996 FEBRUARY 67,399 560,598 627,997 7,342,003 MARCH 267,874 568,574 836,448 7,133,552 APRIL 442,005 565,402 1,007,407 6,962,593 MAY 707,374 542,428 1,249,802 6,720,198 JUNE 922,849 544,079 1,466,928 6,503,072 JULY 1,157,770 549,845 1,707,615 6,262,385 AUGUST 1,437,660 576,399 2,014,059 5,955,941 SEPTEMBER 1,641,519 590,345 2,231,864 5,738,136 OCTOBER 1,886,663 629,365 2,516,028 5,453,972 NOVEMBER 2,074,600 622,375 2,696,975 5,273,025 DECEMBER 2,255,163 601,766 2,856,929 5,113,071

1997 JANUARY 2,457,250 591,533 3,048,783 4,921,217 FEBRUARY 2,654,984 629,997 3,284,981 4,685,019 MARCH 2,857,608 661,164 3,518,772 4,451,228 APRIL 3,097,015 646,709 3,743,724 4,226,276

* MISCELLANEOUS NUMBERS INCLUDE THOSE IN THE 888 SERVICE MANAGEMENT SYSTEM MAINTAINED BY DSMI AND CATEGORIZED AS RESERVED, ASSIGNED BUT NOT YET ACTIVATED, RECENTLY DISCONNECTED, OR SUSPENDED.

90 TABLE 16 900 CODE BALANCE SHEET (AS OF MARCH 31, 1997)

NUMBER ASSIGNED CODES OF CODES

ASSIGNED TO BELL OPERATING COMPANIES FOR INTRALATA 37 CALLS AND A COMMON DATA BASE ASSIGNED TO CANADIAN CARRIERS 15 ASSIGNED TO OFFSHORE AND CARIBBEAN CARRIERS 6

ASSIGNED TO INTEREXCHANGE CARRIERS AT&T 54 MCI 48 LDDS 45 FRONTIER 23 SPRINT 20 ONCOR/ITI 10 60 OTHERS* 136 TOTAL 336

CODES NOT USABLE (211, 311, ETC.) 8 CODES NOT USED FOR 900 SERVICE (000-199) 200 UNASSIGNED CODES 398 TOTAL CODES 1,000

* THIS GROUP CONSISTS PRIMARILY OF INTEREXCHANGE CARRIERS, BUT MAY ALSO INCLUDE A NUMBER OF FIRMS THAT USE THE CODES FOR OTHER PURPOSES.

91 TABLE 17 NUMBER OF 900 CODES ASSIGNED TO INTEREXCHANGE CARRIERS

CODES TOTAL CODES NEW FIRMS TOTAL FIRMS ASSIGNED ASSIGNED ADDED HOLDING CODES DURING AT END DURING AT END YEAR QUARTER OF QUARTER QUARTER OF QUARTER

1987 1ST QUARTER N/A 24 N/A 1 2ND QUARTER 7 31 2 3 3RD QUARTER 8 39 3 6 4TH QUARTER 11 50 2 8

1988 1ST QUARTER 14 64 5 13 2ND QUARTER 34 98 9 22 3RD QUARTER 2 100 0 22 4TH QUARTER 40 140 5 27

1989 1ST QUARTER 13 153 3 30 2ND QUARTER 34 187 12 42 3RD QUARTER 16 203 6 48 4TH QUARTER 47 250 12 60

1990 1ST QUARTER 10 260 3 63 2ND QUARTER 18 278 10 73 3RD QUARTER 15 293 6 79 4TH QUARTER 3 292 0 76

1991 1ST QUARTER 16 308 6 82 2ND QUARTER 13 321 4 86 3RD QUARTER 1 316 1 84 4TH QUARTER - 315 - 84

1992 1ST QUARTER 1 316 1 85 2ND QUARTER - 316 - 85 3RD QUARTER 1 300 1 81 4TH QUARTER 5 298 1 81

1993 1ST QUARTER 6 306 1 82 2ND QUARTER - 306 - 82 3RD QUARTER 2 308 1 82 4TH QUARTER 1 308 - 81

1994 1ST QUARTER 9 317 3 83 2ND QUARTER - 317 - 83 3RD QUARTER 1 318 1 84 4TH QUARTER 1 318 1 83

1995 1ST QUARTER 1 320 1 82 2ND QUARTER 6 321 2 84 3RD QUARTER - 321 - 84 4TH QUARTER 7 328 3 78

1996 1ST QUARTER 5 333 1 75 2ND QUARTER 4 322 - 68 3RD QUARTER 6 323 1 64 4TH QUARTER 7 326 1 66

1997 1ST QUARTER - 336 - 66

92 TABLE 18 LIST OF 900 CODE ASSIGNMENTS SORTED BY CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 200 AT&T COMMUNICATIONS 329 MCI 210 AT&T COMMUNICATIONS 330 AMERICAN INFORMATION NETWORK / DATA DEVICE 220 AT&T COMMUNICATIONS 331 LDDS WORLDCOM 221 CABLE & WIRELESS, INC. 332 PILGRIM TELEPHONE CO. 222 MARATHON COMMUNICATIONS 333 U S WEST COMMUNICATIONS 223 CABLE & WIRELESS, INC. 334 BERMUDA TELEPHONE CO. (BERTELCO) 224 FRONTIER COMMUNICATIONS SERVICES, INC. 335 BELL ATLANTIC 225 AT&T COMMUNICATIONS 336 MCI 226 MCI 337 NORTHERN ARIZONA LONG DISTANCE 227 FRONTIER COMMUNICATIONS SERVICES, INC. 338 AMERITECH AUDIOTEX SERVICES, INC. 229 LDDS WORLDCOM 339 AT&T COMMUNICATIONS 230 SPRINT 340 AMERITECH AUDIOTEX SERVICES, INC. 231 TELECOM OPTIONS PLUS, INC. 341 U S WEST COMMUNICATIONS 232 SUPERIOR TELECOM 342 AT&T COMMUNICATIONS 233 CABLE & WIRELESS, INC. 344 AT&T COMMUNICATIONS 234 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 345 FRONTIER COMMUNICATIONS SERVICES, INC. 235 AMERITECH SERVICES 346 SPRINT 236 FRONTIER COMMUNICATIONS SERVICES, INC. 347 MCI 238 DELTA COMMUNICATIONS, INC. 349 NETWORK LONG DISTANCE 239 DELTA COMMUNICATIONS, INC. 350 AT&T COMMUNICATIONS 240 U S WEST COMMUNICATIONS 355 LDDS WORLDCOM 242 SUPERIOR TELECOM 356 ACC LONG DISTANCE 244 PRIMETEL COMMUNICATIONS, INC. 357 LDDS WORLDCOM 245 AMERIVISION COMMUNICATIONS, INC. 360 PRIMETEL COMMUNICATIONS, INC. 246 SPRINT 361 LCI INTERNATIONAL 247 PHOENIX COMMUNICATIONS GROUP 365 SPRINT / LONG DISTANCE USA 248 AMERITECH SERVICES 366 CONSUMER DATA SOLUTIONS (CDS) 250 AT&T COMMUNICATIONS 367 AMERITECH AUDIOTEX SERVICES, INC. 252 U. S. LINK LONG DISTANCE 369 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 254 TOTAL-TEL USA 370 AT&T COMMUNICATIONS 255 MCI 373 LDDS WORLDCOM 258 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 374 CONSOLIDATED COMMUNICATIONS 259 LONG DISTANCE SAVERS 377 SPRINT / SPRINTNET 260 AT&T COMMUNICATIONS 378 MCI 262 SPRINT 382 SCHERERS COMMUNICATIONS GROUP, INC. 263 MCI 386 SPRINT 264 ADVANTAGE NETWORK, INC. 388 MCI 265 MCI 395 FRONTIER COMMUNICATIONS SERVICES, INC. 266 LDDS WORLDCOM 399 PAC-WEST TELECOMM dba AMERICALL 267 MCI 400 AT&T COMMUNICATIONS 268 AT&T COMMUNICATIONS 401 GTE HAWAIIAN TELEPHONE COMPANY 269 INTERNATIONAL TELEMEDIA ASSOCIATES, INC.(ITA) 404 NETWORK TELEPHONE SERVICES, INC. 272 BELL ATLANTIC 407 AT&T COMMUNICATIONS 273 STENTOR CANADIAN NETWORK MANAGEMENT 408 UNITED TELEPHONE LONG DISTANCE 275 LDDS WORLDCOM 410 AT&T COMMUNICATIONS 277 INTERACTIVE TELECOM NETWORK, INC. 412 LDDS WORLDCOM 278 PHOENIX COMMUNICATIONS GROUP 414 SCHERERS COMMUNICATIONS GROUP, INC. 280 AMERITECH SERVICES 420 AT&T COMMUNICATIONS 282 LCI INTERNATIONAL 421 BITTEL TELECOMMUNICATIONS CORPORATION 284 BTI TELECOMMUNICATIONS SERVICES 422 FRONTIER COMMUNICATIONS SERVICES, INC. 285 MCI 424 LDDS WORLDCOM 286 PRIMETEL COMMUNICATIONS, INC. 425 CAPITAL NETWORK SYSTEM, INC. 287 MCI 426 PILGRIM TELEPHONE CO. 288 AT&T COMMUNICATIONS 428 AMERITECH SERVICES 289 MCI 429 NORTH COUNTY COMMUNICATIONS, INC. 296 LONG DISTANCE SAVERS 430 U S WEST COMMUNICATIONS 300 AT&T COMMUNICATIONS 432 AMERITECH AUDIOTEX SERVICES, INC. 301 AMERITECH SERVICES 435 MCI 302 AMERITECH SERVICES 436 AT&T COMMUNICATIONS 303 PACIFIC TELESIS 438 MCI 306 SOUTHERN NEW ENGLAND TELEPHONE (SNET) 440 AMERICAN INFORMATION NETWORK / DATA DEVICE 313 COLONIAL COMMUNICATIONS 441 AMERITECH AUDIOTEX SERVICES, INC. 314 COLONIAL COMMUNICATIONS 443 MCI 321 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 444 FEDERAL TRANSTEL, INC. 322 CABLE & WIRELESS, INC. 446 MCI 324 WILTEL LONG DISTANCE SERVICES 447 PHOENIX COMMUNICATIONS GROUP 326 LCI INTERNATIONAL 448 MCI 327 EASTERN TEL LONG DISTANCE SERVICE, INC. 450 AMERITECH SERVICES 328 AT&T COMMUNICATIONS 451 STENTOR CANADIAN NETWORK MANAGEMENT

93 TABLE 18 LIST OF 900 CODE ASSIGNMENTS--CONTINUED SORTED BY CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 452 IXC LONG DISTANCE 638 INTERNATIONAL TELEMEDIA ASSOCS., INC.(ITA) 454 AT&T COMMUNICATIONS 639 PILGRIM TELEPHONE CO. 456 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 640 AMERITECH AUDIOTEX SERVICES, INC. 463 SPRINT 641 U S ADVANTAGE LONG DISTANCE, INC. 468 SPRINT 642 SPRINT 469 WESTEL, INC. 643 STENTOR CANADIAN NETWORK MANAGEMENT 474 MICROVOICE APPLICATIONS, INC. 644 BRIDGE WATER TELEPHONE CO. 476 MCI 645 STENTOR CANADIAN NETWORK MANAGEMENT 477 PAC-WEST TELECOMM dba AMERICALL 646 SPRINT 478 ALASCOM 650 AT&T COMMUNICATIONS 480 AT&T COMMUNICATIONS 653 BITTEL TELECOMMUNICATIONS CORPORATION 483 GTE MIDWEST TELEPHONE OPERATIONS 654 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 484 MCI 655 COM SYSTEMS, INC. 486 MCI 656 MCI 487 INTEGRETEL, INC. 659 MCI 489 INTERNATIONAL TELEMEDIA ASSOCS., INC.(ITA) 660 AT&T COMMUNICATIONS 490 AT&T COMMUNICATIONS 662 WILTEL LONG DISTANCE SERVICES 500 AT&T COMMUNICATIONS 663 DMM ENTERPRISE 505 PACIFIC TELESIS 665 FRONTIER COMMUNICATIONS SERVICES, INC. 508 UNITED TELEPHONE LONG DISTANCE 666 FEDERAL TRANSTEL, INC. 519 INTERNATIONAL TELECOMMUNICATIONS CORP. 667 NETWORK OPERATOR SERVICES, INC. 520 AT&T COMMUNICATIONS 669 MARATHON COMMUNICATIONS 523 CABLE & WIRELESS, PLC. 670 STENTOR CANADIAN NETWORK MANAGEMENT 525 MCI 673 FBN AMERICA, INC. 526 MCI 674 FEDERAL TRANSTEL, INC. 527 AT&T COMMUNICATIONS 676 WILTEL LONG DISTANCE SERVICES 528 NETWORK TELEPHONE SERVICES, INC. 677 STENTOR CANADIAN NETWORK MANAGEMENT 533 LDDS WORLDCOM 678 MCI 535 SPRINT 679 LDDS WORLDCOM 537 FEDERAL TRANSTEL, INC. 680 AT&T COMMUNICATIONS 538 INTERNATIONAL TELEMEDIA ASSOCS., INC.(ITA) 683 LDDS WORLDCOM 540 FRONTIER COMMUNICATIONS SERVICES, INC. 684 NEW TIMES, INC. 543 FRONTIER COMMUNICATIONS SERVICES, INC. 686 LCI INTERNATIONAL 544 BITTEL TELECOMMUNICATIONS CORPORATION 690 STENTOR CANADIAN NETWORK MANAGEMENT 545 GTE CALIFORNIA 691 TEXUSTEL, INC. 546 WILTEL LONG DISTANCE SERVICES 695 TRESCOM INTERNATIONAL, CARIBBEAN DIVISION 549 CALL AMERICA BUSINESS COMMUNICATIONS 699 PILGRIM TELEPHONE CO. 550 FRONTIER COMMUNICATIONS SERVICES, INC. 700 SPRINT 551 AMERITECH AUDIOTEX SERVICES, INC. 701 BELL ATLANTIC 555 AT&T COMMUNICATIONS 707 NETWORK TELEPHONE SERVICES, INC. 561 STENTOR CANADIAN NETWORK MANAGEMENT 710 TCC COMMUNICATIONS, INC. 562 MCI 720 AT&T COMMUNICATIONS 563 SPRINT / LONG DISTANCE USA 722 MCI 564 LOMI LONG DISTANCE 724 FRONTIER COMMUNICATIONS SERVICES, INC. 565 STENTOR CANADIAN NETWORK MANAGEMENT 725 MCI 567 FRONTIER COMMUNICATIONS SERVICES, INC. 726 MCI 568 SPRINT 727 GTE CALIFORNIA 575 LDDS WORLDCOM 729 ALTERNATIVE LONG DISTANCE, INC. 580 U S WEST COMMUNICATIONS 730 AT&T COMMUNICATIONS 583 VARTEC NATIONAL, INC. 733 MCI 588 INTERACTIVE TELECOM NETWORK, INC. 736 TELECOMMS. SVCS. OF TRINIDAD & TOBAGO, LTD. 590 AT&T COMMUNICATIONS 737 AT&T COMMUNICATIONS 595 STENTOR CANADIAN NETWORK MANAGEMENT 738 AT&T COMMUNICATIONS 600 AT&T COMMUNICATIONS 739 LDDS WORLDCOM 606 SOUTHERN NEW ENGLAND TELEPHONE (SNET) 740 AT&T COMMUNICATIONS 610 ARVIG TELEPHONE CO. 741 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 620 AMERITECH SERVICES 742 PHONE AMERICA 622 MCI 743 INTERNATIONAL TELEMEDIA ASSOCS., INC.(ITA) 624 MCI 745 MCI 626 LDDS WORLDCOM 746 LDDS WORLDCOM 627 AMERITECH AUDIOTEX SERVICES, INC. 747 LDDS WORLDCOM 628 AMERITECH SERVICES 748 VARTEC NATIONAL, INC. 629 WESTEL, INC. 749 LDDS WORLDCOM 630 STENTOR CANADIAN NETWORK MANAGEMENT 750 STENTOR CANADIAN NETWORK MANAGEMENT 632 LDDS WORLDCOM 752 NORTH COUNTY COMMUNICATIONS, INC. 633 MICROVOICE APPLICATIONS, INC. 753 FRONTIER COMMUNICATIONS SERVICES, INC. 635 FRONTIER COMMUNICATIONS SERVICES, INC. 755 SOUTHWEST LONG DISTANCE NETWORK 636 LDDS WORLDCOM 758 FRONTIER COMMUNICATIONS SERVICES, INC. 637 U S ADVANTAGE LONG DISTANCE, INC. 763 BITTEL TELECOMMUNICATIONS CORPORATION

94 TABLE 18 LIST OF 900 CODE ASSIGNMENTS--CONTINUED SORTED BY CODE (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 764 PHOENIX COMMUNICATIONS GROUP 903 AT&T COMMUNICATIONS 765 FRONTIER COMMUNICATIONS SERVICES, INC. 909 AT&T COMMUNICATIONS 766 MICROVOICE APPLICATIONS, INC. 919 INTERACTIVE TELECOM NETWORK, INC. 770 NYNEX 920 AT&T COMMUNICATIONS 771 DIGITAL NETWORK, INC. 924 AMERITECH SERVICES 772 MCI 929 SPRINT 773 AT&T COMMUNICATIONS 932 AT&T COMMUNICATIONS 776 MCI 933 AT&T COMMUNICATIONS 777 FEDERAL TRANSTEL, INC. 937 PRIMETEL COMMUNICATIONS, INC. 778 AMERITECH SERVICES 938 FEDERAL TRANSTEL, INC. 779 MCI 942 WESTEL, INC. 780 AMERITECH SERVICES 943 WESTEL, INC. 782 AMERICAN INFORMATION NETWORK / DATA DEVICE 945 MCI 784 SUNTEL NETWORK, INC. 946 AMERITECH AUDIOTEX SERVICES, INC. 785 COLONIAL COMMUNICATIONS 948 PAC-WEST TELECOMM dba AMERICALL 786 AT&T COMMUNICATIONS 949 LDDS WORLDCOM 787 MCI 950 MCI 789 TELVUE CORP. 951 LDDS WORLDCOM 792 STENTOR CANADIAN NETWORK MANAGEMENT 955 COLONIAL COMMUNICATIONS 800 SPRINT 958 U S ADVANTAGE LONG DISTANCE, INC. 801 BELL ATLANTIC 960 LDDS WORLDCOM 808 NETWORK TELEPHONE SERVICES, INC. 963 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 820 AT&T COMMUNICATIONS 968 INTEGRETEL, INC. 822 WILTEL LONG DISTANCE SERVICES 969 INTERACTIVE TELECOM NETWORK, INC. 825 MCI 970 LDDS WORLDCOM 826 WILTEL LONG DISTANCE SERVICES 971 LDDS WORLDCOM 828 LDDS WORLDCOM 972 LDDS WORLDCOM 830 STENTOR CANADIAN NETWORK MANAGEMENT 973 LDDS WORLDCOM 832 MCI 974 FRONTIER COMMUNICATIONS SERVICES, INC. 835 MCI 975 FRONTIER COMMUNICATIONS SERVICES, INC. 839 WESTEL, INC. 976 AT&T COMMUNICATIONS 840 AT&T COMMUNICATIONS 977 FRONTIER COMMUNICATIONS SERVICES, INC. 843 FEDERAL TRANSTEL, INC. 978 FRONTIER COMMUNICATIONS SERVICES, INC. 844 PACIFIC TELESIS 979 FRONTIER COMMUNICATIONS SERVICES, INC. 847 SPRINT 980 INTERACTIVE TELECOM NETWORK, INC. 848 GTE CALIFORNIA 986 AT&T COMMUNICATIONS 850 AT&T COMMUNICATIONS 987 TELVUE CORP. 851 DIGITEL 988 MCI 852 LDDS WORLDCOM 989 NETWORK TELEPHONE SERVICES, INC. 853 TELEFONICA LARGA DISTANCIA 990 MCI 856 IOWA NETWORK SERVICES, INC. 991 AMERICAN LONG LINES 857 WILTEL LONG DISTANCE SERVICES 992 LDDS WORLDCOM 858 U. S. LINK LONG DISTANCE 993 MCI 860 AT&T COMMUNICATIONS 994 LDDS WORLDCOM 864 MCI 995 LDDS WORLDCOM 866 ALASCOM 996 LDDS WORLDCOM 867 VORTEL 997 WILTEL LONG DISTANCE SERVICES 868 MCI 998 TELESCAN 869 FEDERAL TRANSTEL, INC. 999 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 870 STENTOR CANADIAN NETWORK MANAGEMENT 872 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 873 FEDERAL TRANSTEL, INC. 874 AMERITECH AUDIOTEX SERVICES, INC. 875 CONQUEST OPERATOR SERVICES CORP. 877 BITTEL TELECOMMUNICATIONS CORPORATION 878 USTEL 879 PRIMETEL COMMUNICATIONS, INC. 880 NYNEX 883 COLONIAL COMMUNICATIONS 884 AT&T COMMUNICATIONS 885 TELVUE CORP. 888 CABLE & WIRELESS, INC. 890 AMERICAN INFORMATION NETWORK / DATA DEVICE 896 AT&T COMMUNICATIONS 897 PHOENIX COMMUNICATIONS GROUP 898 WILTEL LONG DISTANCE SERVICES 899 VITELCOM, INC. 900 CABLE & WIRELESS, INC. 901 BELL ATLANTIC

95 TABLE 19 LIST OF 900 CODE ASSIGNMENTS SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 356 ACC LONG DISTANCE 738 AT&T COMMUNICATIONS 264 ADVANTAGE NETWORK, INC. 740 AT&T COMMUNICATIONS 478 ALASCOM 773 AT&T COMMUNICATIONS 866 ALASCOM 786 AT&T COMMUNICATIONS 729 ALTERNATIVE LONG DISTANCE, INC. 820 AT&T COMMUNICATIONS 330 AMERICAN INFORMATION NETWORK / DATA DEVICE 840 AT&T COMMUNICATIONS 440 AMERICAN INFORMATION NETWORK / DATA DEVICE 850 AT&T COMMUNICATIONS 782 AMERICAN INFORMATION NETWORK / DATA DEVICE 860 AT&T COMMUNICATIONS 890 AMERICAN INFORMATION NETWORK / DATA DEVICE 884 AT&T COMMUNICATIONS 991 AMERICAN LONG LINES 896 AT&T COMMUNICATIONS 338 AMERITECH AUDIOTEX SERVICES, INC. 903 AT&T COMMUNICATIONS 340 AMERITECH AUDIOTEX SERVICES, INC. 909 AT&T COMMUNICATIONS 367 AMERITECH AUDIOTEX SERVICES, INC. 920 AT&T COMMUNICATIONS 432 AMERITECH AUDIOTEX SERVICES, INC. 932 AT&T COMMUNICATIONS 441 AMERITECH AUDIOTEX SERVICES, INC. 933 AT&T COMMUNICATIONS 551 AMERITECH AUDIOTEX SERVICES, INC. 976 AT&T COMMUNICATIONS 627 AMERITECH AUDIOTEX SERVICES, INC. 986 AT&T COMMUNICATIONS 640 AMERITECH AUDIOTEX SERVICES, INC. 272 BELL ATLANTIC 874 AMERITECH AUDIOTEX SERVICES, INC. 335 BELL ATLANTIC 946 AMERITECH AUDIOTEX SERVICES, INC. 701 BELL ATLANTIC 235 AMERITECH SERVICES 801 BELL ATLANTIC 248 AMERITECH SERVICES 901 BELL ATLANTIC 280 AMERITECH SERVICES 334 BERMUDA TELEPHONE CO. (BERTELCO) 301 AMERITECH SERVICES 421 BITTEL TELECOMMUNICATIONS CORPORATION 302 AMERITECH SERVICES 544 BITTEL TELECOMMUNICATIONS CORPORATION 428 AMERITECH SERVICES 653 BITTEL TELECOMMUNICATIONS CORPORATION 450 AMERITECH SERVICES 763 BITTEL TELECOMMUNICATIONS CORPORATION 620 AMERITECH SERVICES 877 BITTEL TELECOMMUNICATIONS CORPORATION 628 AMERITECH SERVICES 644 BRIDGE WATER TELEPHONE CO. 778 AMERITECH SERVICES 284 BTI TELECOMMUNICATIONS SERVICES 780 AMERITECH SERVICES 221 CABLE & WIRELESS, INC. 924 AMERITECH SERVICES 223 CABLE & WIRELESS, INC. 245 AMERIVISION COMMUNICATIONS, INC. 233 CABLE & WIRELESS, INC. 610 ARVIG TELEPHONE CO. 322 CABLE & WIRELESS, INC. 200 AT&T COMMUNICATIONS 888 CABLE & WIRELESS, INC. 210 AT&T COMMUNICATIONS 900 CABLE & WIRELESS, INC. 220 AT&T COMMUNICATIONS 523 CABLE & WIRELESS, PLC. 225 AT&T COMMUNICATIONS 549 CALL AMERICA BUSINESS COMMUNICATIONS 250 AT&T COMMUNICATIONS 425 CAPITAL NETWORK SYSTEM, INC. 260 AT&T COMMUNICATIONS 313 COLONIAL COMMUNICATIONS 268 AT&T COMMUNICATIONS 314 COLONIAL COMMUNICATIONS 288 AT&T COMMUNICATIONS 785 COLONIAL COMMUNICATIONS 300 AT&T COMMUNICATIONS 883 COLONIAL COMMUNICATIONS 328 AT&T COMMUNICATIONS 955 COLONIAL COMMUNICATIONS 339 AT&T COMMUNICATIONS 655 COM SYSTEMS, INC. 342 AT&T COMMUNICATIONS 875 CONQUEST OPERATOR SERVICES CORP. 344 AT&T COMMUNICATIONS 374 CONSOLIDATED COMMUNICATIONS 350 AT&T COMMUNICATIONS 366 CONSUMER DATA SOLUTIONS (CDS) 370 AT&T COMMUNICATIONS 238 DELTA COMMUNICATIONS, INC. 400 AT&T COMMUNICATIONS 239 DELTA COMMUNICATIONS, INC. 407 AT&T COMMUNICATIONS 771 DIGITAL NETWORK, INC. 410 AT&T COMMUNICATIONS 851 DIGITEL 420 AT&T COMMUNICATIONS 663 DMM ENTERPRISE 436 AT&T COMMUNICATIONS 327 EASTERN TEL LONG DISTANCE SERVICE, INC. 454 AT&T COMMUNICATIONS 673 FBN AMERICA, INC. 480 AT&T COMMUNICATIONS 444 FEDERAL TRANSTEL, INC. 490 AT&T COMMUNICATIONS 537 FEDERAL TRANSTEL, INC. 500 AT&T COMMUNICATIONS 666 FEDERAL TRANSTEL, INC. 520 AT&T COMMUNICATIONS 674 FEDERAL TRANSTEL, INC. 527 AT&T COMMUNICATIONS 777 FEDERAL TRANSTEL, INC. 555 AT&T COMMUNICATIONS 843 FEDERAL TRANSTEL, INC. 590 AT&T COMMUNICATIONS 869 FEDERAL TRANSTEL, INC. 600 AT&T COMMUNICATIONS 873 FEDERAL TRANSTEL, INC. 650 AT&T COMMUNICATIONS 938 FEDERAL TRANSTEL, INC. 660 AT&T COMMUNICATIONS 224 FRONTIER COMMUNICATIONS SERVICES, INC. 680 AT&T COMMUNICATIONS 227 FRONTIER COMMUNICATIONS SERVICES, INC. 720 AT&T COMMUNICATIONS 236 FRONTIER COMMUNICATIONS SERVICES, INC. 730 AT&T COMMUNICATIONS 345 FRONTIER COMMUNICATIONS SERVICES, INC. 737 AT&T COMMUNICATIONS 395 FRONTIER COMMUNICATIONS SERVICES, INC.

86 TABLE 19 LIST OF 900 CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 422 FRONTIER COMMUNICATIONS SERVICES, INC. 992 LDDS WORLDCOM 540 FRONTIER COMMUNICATIONS SERVICES, INC. 994 LDDS WORLDCOM 543 FRONTIER COMMUNICATIONS SERVICES, INC. 995 LDDS WORLDCOM 550 FRONTIER COMMUNICATIONS SERVICES, INC. 996 LDDS WORLDCOM 567 FRONTIER COMMUNICATIONS SERVICES, INC. 564 LOMI LONG DISTANCE 635 FRONTIER COMMUNICATIONS SERVICES, INC. 259 LONG DISTANCE SAVERS 665 FRONTIER COMMUNICATIONS SERVICES, INC. 296 LONG DISTANCE SAVERS 724 FRONTIER COMMUNICATIONS SERVICES, INC. 222 MARATHON COMMUNICATIONS 753 FRONTIER COMMUNICATIONS SERVICES, INC. 669 MARATHON COMMUNICATIONS 758 FRONTIER COMMUNICATIONS SERVICES, INC. 226 MCI 765 FRONTIER COMMUNICATIONS SERVICES, INC. 255 MCI 974 FRONTIER COMMUNICATIONS SERVICES, INC. 263 MCI 975 FRONTIER COMMUNICATIONS SERVICES, INC. 265 MCI 977 FRONTIER COMMUNICATIONS SERVICES, INC. 267 MCI 978 FRONTIER COMMUNICATIONS SERVICES, INC. 285 MCI 979 FRONTIER COMMUNICATIONS SERVICES, INC. 287 MCI 545 GTE CALIFORNIA 289 MCI 727 GTE CALIFORNIA 329 MCI 848 GTE CALIFORNIA 336 MCI 401 GTE HAWAIIAN TELEPHONE COMPANY 347 MCI 483 GTE MIDWEST TELEPHONE OPERATIONS 378 MCI 487 INTEGRETEL, INC. 388 MCI 968 INTEGRETEL, INC. 435 MCI 277 INTERACTIVE TELECOM NETWORK, INC. 438 MCI 588 INTERACTIVE TELECOM NETWORK, INC. 443 MCI 919 INTERACTIVE TELECOM NETWORK, INC. 446 MCI 969 INTERACTIVE TELECOM NETWORK, INC. 448 MCI 980 INTERACTIVE TELECOM NETWORK, INC. 476 MCI 519 INTERNATIONAL TELECOMMUNICATIONS CORP. 484 MCI 269 INTERNATIONAL TELEMEDIA ASSOCIATES, INC.(ITA) 486 MCI 489 INTERNATIONAL TELEMEDIA ASSOCIATES, INC.(ITA) 525 MCI 538 INTERNATIONAL TELEMEDIA ASSOCIATES, INC.(ITA) 526 MCI 638 INTERNATIONAL TELEMEDIA ASSOCIATES, INC.(ITA) 562 MCI 743 INTERNATIONAL TELEMEDIA ASSOCIATES, INC.(ITA) 622 MCI 856 IOWA NETWORK SERVICES, INC. 624 MCI 452 IXC LONG DISTANCE 656 MCI 282 LCI INTERNATIONAL 659 MCI 326 LCI INTERNATIONAL 678 MCI 361 LCI INTERNATIONAL 722 MCI 686 LCI INTERNATIONAL 725 MCI 229 LDDS WORLDCOM 726 MCI 266 LDDS WORLDCOM 733 MCI 275 LDDS WORLDCOM 745 MCI 331 LDDS WORLDCOM 772 MCI 355 LDDS WORLDCOM 776 MCI 357 LDDS WORLDCOM 779 MCI 373 LDDS WORLDCOM 787 MCI 412 LDDS WORLDCOM 825 MCI 424 LDDS WORLDCOM 832 MCI 533 LDDS WORLDCOM 835 MCI 575 LDDS WORLDCOM 864 MCI 626 LDDS WORLDCOM 868 MCI 632 LDDS WORLDCOM 945 MCI 636 LDDS WORLDCOM 950 MCI 679 LDDS WORLDCOM 988 MCI 683 LDDS WORLDCOM 990 MCI 739 LDDS WORLDCOM 993 MCI 746 LDDS WORLDCOM 474 MICROVOICE APPLICATIONS, INC. 747 LDDS WORLDCOM 633 MICROVOICE APPLICATIONS, INC. 749 LDDS WORLDCOM 766 MICROVOICE APPLICATIONS, INC. 828 LDDS WORLDCOM 349 NETWORK LONG DISTANCE 852 LDDS WORLDCOM 667 NETWORK OPERATOR SERVICES, INC. 949 LDDS WORLDCOM 404 NETWORK TELEPHONE SERVICES, INC. 951 LDDS WORLDCOM 528 NETWORK TELEPHONE SERVICES, INC. 960 LDDS WORLDCOM 707 NETWORK TELEPHONE SERVICES, INC. 970 LDDS WORLDCOM 808 NETWORK TELEPHONE SERVICES, INC. 971 LDDS WORLDCOM 989 NETWORK TELEPHONE SERVICES, INC. 972 LDDS WORLDCOM 684 NEW TIMES, INC. 973 LDDS WORLDCOM 429 NORTH COUNTY COMMUNICATIONS, INC.

97 TABLE 19 LIST OF 900 CODE ASSIGNMENTS--CONTINUED SORTED BY ENTITY (AS OF MARCH 31, 1997)

CODE ASSIGNED TO CODE ASSIGNED TO 752 NORTH COUNTY COMMUNICATIONS, INC. 853 TELEFONICA LARGA DISTANCIA 337 NORTHERN ARIZONA LONG DISTANCE 234 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 770 NYNEX 258 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 880 NYNEX 321 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 303 PACIFIC TELESIS 369 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 505 PACIFIC TELESIS 456 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 844 PACIFIC TELESIS 654 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 399 PAC-WEST TELECOMM dba AMERICALL 741 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 477 PAC-WEST TELECOMM dba AMERICALL 872 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 948 PAC-WEST TELECOMM dba AMERICALL 963 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 247 PHOENIX COMMUNICATIONS GROUP 999 TELEMATIONS INTERNATIONAL / ONCOR COMMS. 278 PHOENIX COMMUNICATIONS GROUP 998 TELESCAN 447 PHOENIX COMMUNICATIONS GROUP 789 TELVUE CORP. 764 PHOENIX COMMUNICATIONS GROUP 885 TELVUE CORP. 897 PHOENIX COMMUNICATIONS GROUP 987 TELVUE CORP. 742 PHONE AMERICA 691 TEXUSTEL, INC. 332 PILGRIM TELEPHONE CO. 254 TOTAL-TEL USA 426 PILGRIM TELEPHONE CO. 695 TRESCOM INTERNATIONAL, CARIBBEAN DIVISION 639 PILGRIM TELEPHONE CO. 637 U S ADVANTAGE LONG DISTANCE, INC. 699 PILGRIM TELEPHONE CO. 641 U S ADVANTAGE LONG DISTANCE, INC. 244 PRIMETEL COMMUNICATIONS, INC. 958 U S ADVANTAGE LONG DISTANCE, INC. 286 PRIMETEL COMMUNICATIONS, INC. 240 U S WEST COMMUNICATIONS 360 PRIMETEL COMMUNICATIONS, INC. 333 U S WEST COMMUNICATIONS 879 PRIMETEL COMMUNICATIONS, INC. 341 U S WEST COMMUNICATIONS 937 PRIMETEL COMMUNICATIONS, INC. 430 U S WEST COMMUNICATIONS 382 SCHERERS COMMUNICATIONS GROUP, INC. 580 U S WEST COMMUNICATIONS 414 SCHERERS COMMUNICATIONS GROUP, INC. 408 UNITED TELEPHONE LONG DISTANCE 306 SOUTHERN NEW ENGLAND TELEPHONE (SNET) 508 UNITED TELEPHONE LONG DISTANCE 606 SOUTHERN NEW ENGLAND TELEPHONE (SNET) 878 USTEL 755 SOUTHWEST LONG DISTANCE NETWORK 252 U. S. LINK LONG DISTANCE 230 SPRINT 858 U. S. LINK LONG DISTANCE 246 SPRINT 583 VARTEC NATIONAL, INC. 262 SPRINT 748 VARTEC NATIONAL, INC. 346 SPRINT 899 VITELCOM, INC. 386 SPRINT 867 VORTEL 463 SPRINT 469 WESTEL, INC. 468 SPRINT 629 WESTEL, INC. 535 SPRINT 839 WESTEL, INC. 568 SPRINT 942 WESTEL, INC. 642 SPRINT 943 WESTEL, INC. 646 SPRINT 324 WILTEL LONG DISTANCE SERVICES 700 SPRINT 546 WILTEL LONG DISTANCE SERVICES 800 SPRINT 662 WILTEL LONG DISTANCE SERVICES 847 SPRINT 676 WILTEL LONG DISTANCE SERVICES 929 SPRINT 822 WILTEL LONG DISTANCE SERVICES 365 SPRINT / LONG DISTANCE USA 826 WILTEL LONG DISTANCE SERVICES 563 SPRINT / LONG DISTANCE USA 857 WILTEL LONG DISTANCE SERVICES 377 SPRINT / SPRINTNET 898 WILTEL LONG DISTANCE SERVICES 273 STENTOR CANADIAN NETWORK MANAGEMENT 997 WILTEL LONG DISTANCE SERVICES 451 STENTOR CANADIAN NETWORK MANAGEMENT 561 STENTOR CANADIAN NETWORK MANAGEMENT 565 STENTOR CANADIAN NETWORK MANAGEMENT 595 STENTOR CANADIAN NETWORK MANAGEMENT 630 STENTOR CANADIAN NETWORK MANAGEMENT 643 STENTOR CANADIAN NETWORK MANAGEMENT 645 STENTOR CANADIAN NETWORK MANAGEMENT 670 STENTOR CANADIAN NETWORK MANAGEMENT 677 STENTOR CANADIAN NETWORK MANAGEMENT 690 STENTOR CANADIAN NETWORK MANAGEMENT 750 STENTOR CANADIAN NETWORK MANAGEMENT 792 STENTOR CANADIAN NETWORK MANAGEMENT 830 STENTOR CANADIAN NETWORK MANAGEMENT 870 STENTOR CANADIAN NETWORK MANAGEMENT 784 SUNTEL NETWORK, INC. 232 SUPERIOR TELECOM 242 SUPERIOR TELECOM 710 TCC COMMUNICATIONS, INC. 231 TELECOM OPTIONS PLUS, INC. 736 TELECOMMS. SVCS. OF TRINIDAD & TOBAGO, LTD.

98 Customer Response Publication: Long Distance Carrier Code Assignments First Quarter 1997

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