TECHNICAL REFERENCE 41459 AT&T Network Integrated Services Digital Network (ISDN) Primary Rate Interface and Special Application Specification User - Network Interface Description June, 1999 DIRECTOR – Switched Network Architecture and Planning Center ©AT&T, 1999, Printed in U.S.A. AT&T NETWORK INTEGRATED SERVICES DIGITAL NETWORK (ISDN) PRIMARY RATE INTERFACE AND SPECIAL APPLICATIONS SPECIFICATION USER-NETWORK INTERFACE DESCRIPTION CONTENTS OVERVIEW: General Information and Features PART I: Layer 1 - Physical Layer Implementation PART II: Layer 2 - Link Layer Implementation PART III: Layer 3 - Protocol Implementation APPENDIX 1: Service Specific Capabilities APPENDIX 2: Alternate Destination Call Redirection APPENDIX 3: Vari-A-Bill APPENDIX 4: Enhanced Service Provider - Credit Checking Application ANNEX A: User Side and Network Side SDL Diagrams ANNEX B: D-Channel Backup Procedures ANNEX C: Cause Definitions ANNEX D: Examples of Information Element Codings NOTICE AT&T publishes this Technical Reference as a guide for the designers, manufacturers, consultants and suppliers of systems and equipment which would meet the described interface. 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You may direct written requests for further information to: Switched Services Interfaces Group AT&T Laboratories 200 Laurel Avenue Middletown, NJ 07748 To order copies of this document Call: AT&T Customer Information Center USA 1-800-432-6600 AMERICAS +1-317-322-6619 EUROPE/AFRICA/MID-EAST +1-317-322-6416 FAR EAST +1-317-322-6411 Write: AT&T Customer Information Center 2855 North Franklin Road P.O. Box 19901 Indianapolis, IN 46219 USA You may request to be placed on standing order to receive updates automatically. For more information about AT&T documents see: CATALOG OF COMMUNICATIONS TECHNICAL PUBLICATIONS, Publication Number 10000. OVERVIEW AT&T NETWORK ISDN PRIMARY RATE INTERFACE AND SPECIAL APPLICATIONS SPECIFICATION User-Network Interface Description AT&T TR 41459 June 1999 CONTENTS 1. INTRODUCTION ...........................................................................................................................1 1.1 INTRODUCTION TO THIS ISSUE OF TR 41459.................................................................................2 2. SUMMARY OF THE ISDN PRIMARY RATE INTERFACE CHARACTERISTICS................3 2.1 BACKGROUND.............................................................................................................................3 2.2 INTERFACE LAYERS.....................................................................................................................4 2.2.1 Layer 1 (Physical Layer) ....................................................................................................4 2.2.2 Layer 2 (Link Layer)...........................................................................................................4 2.2.3 Layer 3 (Network Layer).....................................................................................................4 2.3 CONFIGURATIONS .......................................................................................................................5 3. FEATURE DESCRIPTIONS ..........................................................................................................8 3.1 64 KBPS CLEAR/RESTRICTED ......................................................................................................8 3.2 WIDEBAND SWITCHING ...............................................................................................................8 3.3 CALL-BY-CALL (CBC) SERVICE SELECTION.................................................................................8 3.3.1 Service Provisioning Options .............................................................................................8 3.3.2 CPE Management of a CBC Pool of Channels ...................................................................9 3.3.3 Subscription Screening.......................................................................................................9 3.4 SERVICE IDENTIFICATION ..........................................................................................................10 3.4.1 Service Identification on Access .......................................................................................10 3.4.2 Service Identification on Egress .......................................................................................10 3.5 SERVICE SCREENING .................................................................................................................10 3.5.1 Screening on CBC TG ......................................................................................................10 3.5.2 Screening on Single Service TG........................................................................................10 3.6 CHANNEL HUNT ALGORITHM ....................................................................................................10 3.7 CALLING PARTY NUMBER (CPN) TO THE NETWORK...................................................................11 3.8 CPN/BN PRIVACY OPTIONING ..................................................................................................11 3.9 CPN/BN TO TERMINATING END................................................................................................12 3.10 INFORMATION INDICATOR (II) DIGITS DELIVERY........................................................................13 3.11 DELIVERY OF THE DIALED NUMBER FOR AT&T ISDN DIRECT EGRESS SERVICES........................14 3.12 CONNECTED LINE IDENTIFICATION (COLI) PRESENTATION ........................................................14 3.13 USER-TO-USER INFORMATION (UUI) EXCHANGE........................................................................14 3.13.1 Message-Associated User-to-User Information (MA UUI) ................................................14 3.13.2 Call Associated Temporary Signaling Connections (CA TSC)...........................................15 3.13.3 Non-Call Associated Temporary Signaling Connection (NCA TSC)..................................16 3.14 B-CHANNEL NEGOTIATION (B-CHANNEL SELECTION - DESTINATION).........................................16 3.15 CAUSES AND DIAGNOSTICS........................................................................................................16 3.16 1+ AND 0+ CALL REDIRECTION .................................................................................................17 3.17 INFORMATION FORWARDING 3 (INFO 3) ...................................................................................17 3.18 CALLER INFORMATION FORWARDING (CINFO)..........................................................................17 3.19 ACCESS TO OPERATOR SERVICES...............................................................................................17 (SM) 3.20 AT&T TOLL FREE TRANSFER CONNECT SERVICE.................................................................18 3.21 DIAL-AROUND CAPABILITY FOR AT&T DIGITAL LINK ...............................................................18 4. AT&T DOMESTIC SWITCHED SERVICES SUPPORTED VIA ISDN PRI............................18 5. AT&T INTERNATIONAL SWITCHED SERVICES SUPPORTED VIA ISDN PRI ................20 Overview i AT&T TR 41459 June 1999 6. CALL PROCESSING....................................................................................................................21 6.1 NUMBER DIGITS........................................................................................................................21 6.2 CUT THROUGH..........................................................................................................................21 6.3 CALL PROGRESS TONES.............................................................................................................22