Feature Document International Direct Distance Dialing (Iddd) No. 3 Electronic Switching System

Feature Document International Direct Distance Dialing (Iddd) No. 3 Electronic Switching System

BELL SYSTEM PRACTICES SECTION 233-190-503 AT&TCo SPCS Issue 1, March 1980 FEATURE DOCUMENT INTERNATIONAL DIRECT DISTANCE DIALING (IDDD) NO. 3 ELECTRONIC SWITCHING SYSTEM CONTENTS PAGE CONTENTS PAGE 9. INSTALLATION/ADDITION/DELETION .. dd INTRODUCTION ........ 3 10. HARDWARE REQUIREMENTS 2. oe we) (6d 1. GENERAL INFORMATION ..... 3 11. SOFTWARE REQUIREMENTS woe ew we UT 2. DEFINITION eee ee ee 3 12. DATA ASSIGNMENTS AND RECORDS . DESCRIPTION ........ 3 13. TESTING woe ee we ee wwe Cd 3. USER OPERATION woe ee ee 3 14. OTHER PLANNING TOPICS re 4. SYSTEM OPERATION , oe ee ee 4 ADMINISTRATION ...... 12 CHARACTERISTICS - ee ee 15. MEASUREMENTS se ew we ew wee) CT 5. FEATURE ASSIGNMENT woe ee 9 16. CHARGING woe ee ew ww ew OT 6. LIMITATIONS woe ee ee ww we) (10 7. INTERACTIONS woe oe ee ew ee 0 SUPPLEMENTARY INFORMATION 12 8. RESTRICTION CAPABILITY ~ ee ew. 7 17. GLOSSARY woe ew we ww we) Od INCORPORATION INTO SYSTEM 11 18. REFERENCES woe ee we we ww NOTICE Not for use or disclosure outside the Bell System except under written agreement Printed in U.S.A. Page 1 SECTION 233-190-503 Figures Tables CONTENTS PAGE CONTENTS PAGE 1. IDDD Flowchart 5 A. Country Codes and National Numbers 4 2. IDDD Translator 7 B. Summary of Outpulsing to TSPS . 10 C. Frequencies for MF Pulsing (in Hertz) 10 Page 2 ISS 1, SECTION 233-190-503 INTRODUCTION When 01 is followed by a “0” (representing an international 0- call), the call is intended for the 1. GENERAL INFORMATION overseas operator. A_ station-to-station call is identified by the prefix “011.” When the prefix 1.01 This document describes the International “01” is followed by the first digit of the country Direct Distance Dialing (IDDD) feature for code (representing an international 0+ call), the the No. 3 Electronic Switching System (ESS). This call is customer dialed but requires the assistance feature provides the capability for direct distance of the TSPS operator (usually for some type of dialing (DDD)outside the North American Network. special billing). No additional hardware is required to provide this feature. 2.04 The country code consists of one to three digits used to identify the country or group 1.02 When this section is reissued, the reasons of countries for which the overseascall is destined. for reissue will be included in this paragraph. After dialing the national number, which may consist of a uniform or a variable quantity of digits, FEATURE AVAILABILITY dialing is considered to be complete. A total quantity of twelve digits are allowed excluding 1.03 The IDDD feature is available for all No. 3 the IDDD access code. See Table A. ESS systems equipped with the 3E3 and later generic programs; however, a special IDDD DESCRIPTION feature package wasprovidedfor specific applications of Issue 4A of the SO-2 generic program. 3. USER OPERATION 2. DEFINITION 3.01 In order to enable dialing to distant countries, country codes are assigned to a country or 2.01 International direct distance dialing (IDDD) group of countries. A national numberis assigned is a feature which allows customers served to each station in order to define the station within by a No. 3 ESSto place calls outside the North the associated country. The international telephone American continent without the assistance of an number consists of the country code and national operator. The No. 3 ESS requires an interface number. with a Traffic Service Position System (TSPS) for the handling of calls involving international numbers. 3.02 Customers using the IDDD feature mustdial For details concerning the world numbering plan one of the three prefix codes. The prefix and the location of international switching centers, code “011” is dialed for direct distance dialing of refer to the Notes On Distance Dialing, Section station-to-station calls. International 0+ calls (those 781-030-100. The TSPS arrangement allows the requiring the assistance of an operator, eg, routing of coin and noncoin calls to TSPS for person-to-person, credit card, etc) use a 2-digit subsequent completion. Section 233-190-149 provides prefix code of “01.” Operator calls use “010” further details concerning operations performed to (international 0-) to reach an overseas assistance provide compatibility between the TSPS and the operator. In the latter case after dialing the code, No. 3 ESS. dialing is considered complete. Operator assistance (010) calls are required when the called number 2.02 Customer routing and charging for IDDD consists of more than 12 digits. calls from a No. 3 ESS office are provided via a TSPS. The TSPS office forwards the call to 3.03 After the prefix code has been dialed, the a gateway office or to an overseas assistance customer continues by dialing the country operator. A call intended for an overseas operator code (CC). The country code consists of one to may be handled by the TSPS operator, or may be three digits used to identify the country or countries forwarded to a gateway center (TSPS option). in which thecalled station is located. The national number (NN)follows the country code and defines 2.03 The IDDDcall type is identified by a 2- or the called station in that country, or group of 3-digit prefix which is dialed preceding the countries. The usual interdigital timing is employed country code and national number. The prefix for the IDDD access code and the country code, “01” identifies the call as an international call. as well as the national number. Page 3 SECTION 233-190-503 TABLE A COUNTRY CODES AND NATIONAL NUMBERS COUNTRY CODE NATIONAL NUMBER COUNTRY (CC) (NN) NO. OF DIGITS HONG HONG 852 6 to 9 IRELAND 353 5 to 8 ISRAEL 972 6 or 7 JAPAN 81 6 to 11 SWITZERLAND 41 5 UNITED KINGDOM 44 7 U.S.S.R. 7 8 Note: This is an example. It is not intended to be accurate or complete. Consult the Traffic Routing Guide for complete details. 3.04 Some countries have a uniform numbering 4.03 When prefix code 01 or 011 has been dialed, plan; therefore, the number of digits to be the customer continues by dialing the country dialed can be predetermined and a normalend-of-dialing code and national number. If the IDDD prefix timing will occur. Some countries have a variable “010” is dialed, the call is intended for an overseas numberof digits in their numbering plan. Customers operator and no other digits are expected. The with a TOUCH-TONE®station dialing these countries IDDD translator provides a code index leading to may dial a “#” digit to indicate to the system that an overseas operator (via a TSPS trunk group). the end of dialing has occurred. Otherwise, a The No. 3 ESS performs a coin return operation waiting period of 4 seconds is required after the if the originating translation indicates that the minimum numberof digits have been dialed. When calling line is a coin line or a toll diversion operation a station- or equipment-in-use condition is encountered, if the calling line is a PBX line. A start codeis an interrupted audible signal is returned to the then determined based on the type of line (coin originating customer. or noncoin), and the leading zero of the prefix is deleted. The remaining digits of the prefix (10) are then outpulsed to the TSPS preceded by a 4. SYSTEM OPERATION keypulse signal and followed by the start code. The TSPS then has the option of handling the call 4.01 A flowchartillustrating the functions required or it may outpulse the proper code to the gateway to provide the IDDD feature is shown in office. When the TSPS is ready to receive the Figure 1. automatic numberidentification (ANI), an off-hook signal is returned to the No. 3 ESS. The operator 4.02 The No. 3 ESS recognizes a customer-dialed then controls the call to completion. international call by the first two digits of the IDDD prefix (01). The last digit of the prefix 4.04 When the prefix “011” or “01” is dialed, (0 or 1) is used to index into the IDDD translator. moredigits are expected. A station-to-station This translator, shown in Figure 2, then translates call requires a “011” prefix and an international the customer’s dialed digits in order to identify a 0+ call (person-to-person, credit card, bill to third valid country code. When the country code has party, collect, etc) requires a “01” prefix. When been identified, the IDDD translator specifies the proper billing information has been obtained, the numberof digits to expect (maximum and minimum) operator connection is released and the TSPS for the international number and provides a code provides the automatic message accounting (AMA) index which eventually points to a TSPS trunk function until the call is completed just as if the group. If the country code is invalid, or if the call was placed without operator assistance. office does not allow IDDD calls, the translator provides a code index which points to some error 4.05 When the “011” or “01” prefix is dialed, treatment as desired by the operating company. the IDDD translator interprets the digits Page 4 ISS 1, SECTION 233-190-503 CUSTOMER DIALS AN IDDD CALL INTERDIGITAL OUTPULSE KEYPULSE, 1, CALLED NUMBER AND TIMEQUT NO. 3 ESS DETECTS 1 NO START CODE TO TSPS IDDD PREFIX MINIMUM NO. OF v (010, 011, 01X) # DIALED DIGITS RECEIVED OUTPULSE ANI (OR ONT), CALLING NUMBER AND RT YES IDDD OPERATOR START CODE TO TSPS _YES ROUTE TO CALL (010) MAXIMUM NO. OF DIGITS RECEIVED REORDER v [NO CUSTOMER DIALED a TSPS CONTROLS CALL OPERATOR SERVED IDDD STATION-TO- TO COMPLETION NEXT DIGIT RCVD CALL (01X - X IS -< STATION (011) FIRST DIGIT OF WITHIN 4 SEC.

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