• TS 124 008 : 13.5.0

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    DIGITAL CELLULAR TELECOMMUNICATIONS SYSTEM (PHASE 2+) (GSM); UNIVERSAL MOBILE TELECOMMUNICATIONS SYSTEM (UMTS); LTE; MOBILE RADIO INTERFACE LAYER 3 SPECIFICATION; CORE NETWORK PROTOCOLS; STAGE 3 (3GPP TS 24.008 VERSION 14.7.0 RELEASE 14)

    Available format(s):  Hardcopy, PDF

    Superseded date:  03-10-2019

    Language(s):  English

    Published date: 

    Publisher:  European Telecommunications Standards Institute

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    Table of Contents - (Show below) - (Hide below)

    Intellectual Property Rights
    Foreword
    Modal verbs terminology
    Foreword
    Introduction
    1 Scope
    2 References
    3 Radio Resource management procedures
    4 Elementary procedures for Mobility Management
    5 Elementary procedures for circuit-switched Call
       Control
    6 Support for packet services
    7 Examples of structured procedures
    8 Handling of unknown, unforeseen, and erroneous
       protocol data
    9 Message functional definitions and contents
    10 General message format and information elements coding
    11 List of system parameters
    Annex A (informative) - Example of subaddress information
            element coding
    Annex B (normative) - Compatibility checking
    Annex C (normative) - Low layer information coding
            principles
    Annex D (informative) - Examples of bearer capability
            information element coding
    Annex E (informative) - Comparison between call control
            procedures specified in 3GPP TS 24.008 and ITU-T
            Recommendation Q.931
    Annex F (informative) - A/Gb mode specific cause values
            for radio resource management
    Annex G (informative) - 3GPP specific cause values for
            mobility management
    Annex H (informative) - 3GPP specific cause values for
            call control
    Annex I (informative) - GPRS specific cause values for
            GPRS Session Management
    Annex J (informative) - Algorithm to encode frequency
            list information elements
    Annex K (informative) - Default Codings of Information
            Elements
    Annex L (normative) - Establishment cause (Iu mode only)
    Annex M (normative) - Additional Requirements for backward
            compatibility with PCS 1900 for NA revision 0 ME
    Annex N (normative) - Ranking of reject causes for Location
            Registration (MM and GMM) in a shared network
    Annex O (normative) - 3GPP capability exchange protocol
    Annex P (normative) - Mobility management for IMS voice
            termination
    Annex Q (informative) - Change History
    History

    Abstract - (Show below) - (Hide below)

    Defines the procedures used at the radio interface core network protocols within the 3[rd] generation mobile telecommunications system and the digital cellular telecommunications system.

    General Product Information - (Show below) - (Hide below)

    Committee 3GPP CT 1
    Document Type Standard
    Publisher European Telecommunications Standards Institute
    Status Superseded

    Standards Referenced By This Book - (Show below) - (Hide below)

    DIN EN 16454:2015-12 Intelligent transport systems - ESafety - ECall end to end conformance testing
    ES 201 671 : 3.1.1 LAWFUL INTERCEPTION (LI); HANDOVER INTERFACE FOR THE LAWFUL INTERCEPTION OF TELECOMMUNICATIONS TRAFFIC
    I.S. EN 16062:2015 INTELLIGENT TRANSPORT SYSTEMS - ESAFETY - ECALL HIGH LEVEL APPLICATION REQUIREMENTS (HLAP) USING GSM/UMTS CIRCUIT SWITCHED NETWORKS
    TS 102 744-1-2 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); FAMILY SL SATELLITE RADIO INTERFACE (RELEASE 1); PART 1: GENERAL SPECIFICATIONS; SUB-PART 2: SYSTEM OPERATION OVERVIEW
    TS 101 376-3-3 : 3.3.1 GEO-MOBILE RADIO INTERFACE SPECIFICATIONS (RELEASE 3); THIRD GENERATION SATELLITE PACKET RADIO SERVICE; PART 3: NETWORK SPECIFICATIONS; SUB-PART 3: NUMBERING, ADDRESSING AND IDENTIFICATION; GMR-1 3G 23.003
    TR 102 061 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); SATELLITE COMPONENT OF UMTS/IMT 2000; DETAILED ANALYSIS OF THE PACKET MODE FOR THE SW-CDMA (FAMILY A)
    TS 102 744-3-6 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); FAMILY SL SATELLITE RADIO INTERFACE (RELEASE 1); PART 3: CONTROL PLANE AND USER PLANE SPECIFICATIONS; SUB-PART 6: ADAPTATION LAYER OPERATION
    TR 102 180 : 1.5.1 EMERGENCY COMMUNICATIONS (EMTEL); BASIS OF REQUIREMENTS FOR COMMUNICATION OF INDIVIDUALS WITH AUTHORITIES/ORGANIZATIONS IN CASE OF DISTRESS (EMERGENCY CALL HANDLING)
    S.R. CEN/TS 16454:2013 INTELLIGENT TRANSPORT SYSTEMS - ESAFETY - ECALL END TO END CONFORMANCE TESTING
    TS 103 202-2 : 1.1.1 CORE NETWORK AND INTEROPERABILITY TESTING (INT); GTPV2-C CONFORMANCE TESTING FOR S11 INTERFACE; (3GPP[TM] RELEASE 10); PART 2: TEST SUITE STRUCTURE AND TEST PURPOSES (TSS&TP)
    TS 102 384 : 10.3.0 SMART CARDS; UICC-TERMINAL INTERFACE; CARD APPLICATION TOOLKIT (CAT) CONFORMANCE SPECIFICATION (RELEASE 10)
    CEN/TS 16454:2013 Intelligent transport systems - ESafety - ECall end to end conformance testing
    EN 16454:2015 Intelligent transport systems - ESafety - ECall end to end conformance testing
    TS 102 111-1 : 1.1.1 SERVICES AND PROTOCOLS FOR ADVANCE NETWORK (SPAN); NETWORK INTEGRATION TESTING BETWEEN GENERAL PACKET RADIO SERVICE (GPRS) AND INTERNET PROTOCOL (IP) NETWORKS PART 1: TEST SUITE STRUCTURE AND TEST PURPOSES (TSS&TP)
    TS 102 744-1-4 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); FAMILY SL SATELLITE RADIO INTERFACE (RELEASE 1); PART 1: GENERAL SPECIFICATIONS; SUB-PART 4: APPLICABLE EXTERNAL SPECIFICATIONS, SYMBOLS AND ABBREVIATIONS
    TS 103 484-2 : 9.0.0 SMART CARDS; TEST SPECIFICATION FOR THE SECURE CHANNEL INTERFACE; PART 2: UICC FEATURES (RELEASE 9)
    TS 102 936-1 : 1.1.1 ECALL NETWORK ACCESS DEVICE (NAD) CONFORMANCE SPECIFICATION; PART 1: PROTOCOL TEST SPECIFICATION
    PD CEN/TS 16454:2013 Intelligent transport systems. ESafety. ECall end to end conformance testing
    14/30300577 DC : 0 BS EN 16454 - INTELLIGENT TRANSPORT SYSTEMS - ESAFETY - ECALL END TO END CONFORMANCE TESTING
    TS 102 744-1-1 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); FAMILY SL SATELLITE RADIO INTERFACE (RELEASE 1); PART 1: GENERAL SPECIFICATIONS; SUB-PART 2: SYSTEM OPERATION OVERVIEW
    PREN 16072 : DRAFT 2010 INTELLIGENT TRANSPORT SYSTEMS - ESAFETY - PAN EUROPEAN ECALL-OPERATING REQUIREMENTS
    TS 103 484-1 : 9.0.0 SMART CARDS; TEST SPECIFICATION FOR THE SECURE CHANNEL INTERFACE; PART 1: TERMINAL FEATURES (RELEASE 9)
    TS 101 376-1-2 : 3.3.1 GEO-MOBILE RADIO INTERFACE SPECIFICATIONS (RELEASE 3); THIRD GENERATION SATELLITE PACKET RADIO SERVICE; PART 1: GENERAL SPECIFICATIONS; SUB-PART 2: INTRODUCTION TO THE GMR-1 FAMILY; GMR-1 3G 41.201
    TS 103 428 : 1.1.1 MOBILE STANDARDS GROUP (MSG); ECALL HLAP INTEROPERABILITY TESTING
    TS 102 936-2 : 1.1.1 ECALL NETWORK ACCESS DEVICE (NAD) CONFORMANCE SPECIFICATION; PART 2: TEST SUITES
    TR 102 200 : 1.1.1 METHODS FOR TESTING AND SPECIFICATION (MTS); UMTS TESTING METHODOLOGY
    I.S. EN 16454:2015 INTELLIGENT TRANSPORT SYSTEMS - ESAFETY - ECALL END TO END CONFORMANCE TESTING
    TS 103 412 : 1.2.1 MOBILE STANDARDS GROUP (MSG); PAN-EUROPEAN ECALL END TO END AND IN-BAND MODEM CONFORMANCE TESTING; PROSE TEST SPECIFICATION
    TS 102 744-4-2 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); FAMILY SL SATELLITE RADIO INTERFACE (RELEASE 1); PART 4: ENHANCED SERVICES AND APPLICATIONS; SUB-PART 2: AERONAUTICAL SAFETY SERVICES
    TS 102 250-7 : 1.1.1 SPEECH AND MULTIMEDIA TRANSMISSION QUALITY (STQ); QOS ASPECTS FOR POPULAR SERVICES IN GSM AND 3G NETWORKS; PART 7: NETWORK BASED QUALITY OF SERVICE MEASUREMENTS
    TS 101 863-5 : 1.1.1 DIGITAL ENHANCED CORDLESS TELECOMMUNICATIONS (DECT); DECT/UMTS INTERWORKING PROFILE (IWP); PART 5: SMS POINT-TO-POINT AND CELL BROADCAST
    TR 103 140 : 1.1.1 MOBILE STANDARDS GROUP (MSG); ECALL FOR VOIP
    TS 102 110-1 : 1.1.1 SERVICES AND PROTOCOLS FOR ADVANCED NETWORK (SPAN); NETWORK INTEGRATION TESTING OF UNIVERSAL MOBILE TELECOMMUNICATIONS SYSTEM (UMTS) WITH GLOBAL SYSTEM FOR MOBILE COMMUNICATION (GSM) PHASE 2+, PUBLIC SWITCHED TELEPHONE NETWORK (PSTN) AND INTEGRATED SERVICES DIGITAL NETWORK (ISDN); PART 1: TEST SUITE STRUCTURE AND TEST PURPOSES (TSS&TP)
    10/30214655 DC : 0 BS EN 16072 - INTELLIGENT TRANSPORT SYSTEMS - ESAFETY - PAN EUROPEAN ECALL-OPERATING REQUIREMENTS
    TS 101 376-3-23 : 3.3.1 GEO-MOBILE RADIO INTERFACE SPECIFICATIONS (RELEASE 3); THIRD GENERATION SATELLITE PACKET RADIO SERVICE; PART 3: NETWORK SPECIFICATIONS; SUB-PART 23: RADIO ACCESS NETWORK; OVERALL DESCRIPTION - STAGE 2; GMR-1 3G 43.051
    TS 101 376-4-7 : 3.3.1 GEO-MOBILE RADIO INTERFACE SPECIFICATIONS (RELEASE 3); THIRD GENERATION SATELLITE PACKET RADIO SERVICE; PART 4: RADIO INTERFACE PROTOCOL SPECIFICATIONS; SUB-PART 7: MOBILE RADIO INTERFACE SIGNALLING LAYER 3 GENERAL ASPECTS; GMR-1 3G 24.007
    TS 101 863-6 : 1.1.1 DIGITAL ENHANCED CORDLESS TELECOMMUNICATIONS (DECT); DECT/UMTS INTERWORKING PROFILE (IWP); PART 6: PACKET SWITCHED DATA
    UNE-EN 16454:2016 Intelligent transport systems - ESafety - ECall end to end conformance testing
    10/30214021 DC : 0 BS EN 16062 - INTELLIGENT TRANSPORT SYSTEMS - ESAFETY - ECALL HIGH LEVEL APPLICATION REQUIREMENTS (HLAP)
    BS EN 16454:2015 Intelligent transport systems. ESafety. ECall end to end conformance testing
    EN 300 175-5 : 2.6.1 DIGITAL ENHANCED CORDLESS TELECOMMUNICATIONS (DECT); COMMON INTERFACE (CI); PART 5: NETWORK (NWK) LAYER
    DIN EN 16062:2015-08 Intelligent transport systems - ESafety - eCall high level application requirements (HLAP) using GSM/UMTS circuit switched networks
    TR 103 168 : 1.1.1 METHODS FOR TESTING AND SPECIFICATIONS (MTS); APPLICATION OF MODEL-BASED TESTING IN THE TELECOMS DOMAIN
    TS 102 610 : 1.3.0 RAILWAYS TELECOMMUNICATIONS (RT); GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS (GSM); USAGE OF THE USER-TO-USER INFORMATION ELEMENT FOR GSM OPERATION ON RAILWAYS
    TS 101 376-4-8 : 3.4.1 GEO-MOBILE RADIO INTERFACE SPECIFICATIONS (RELEASE 3); THIRD GENERATION SATELLITE PACKET RADIO SERVICE; PART 4: RADIO INTERFACE PROTOCOL SPECIFICATIONS; SUB-PART 8: MOBILE RADIO INTERFACE LAYER 3 SPECIFICATIONS; GMR-1 3G 44.008
    TS 103 066 : 1.1.2 RAILWAY TELECOMMUNICATIONS (RT); REL-4 CORE NETWORK REQUIREMENTS FOR GSM-R
    TS 102 744-3-7 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); FAMILY SL SATELLITE RADIO INTERFACE (RELEASE 1); PART 3: CONTROL PLANE AND USER PLANE SPECIFICATIONS; SUB-PART 7: NAS LAYER INTERFACE EXTENSIONS FOR MBMS SERVICES
    TS 101 671 : 3.14.1 LAWFUL INTERCEPTION (LI); HANDOVER INTERFACE FOR THE LAWFUL INTERCEPTION OF TELECOMMUNICATIONS TRAFFIC
    TS 102 650 : 1.1.1 TELECOMMUNICATIONS AND INTERNET CONVERGED SERVICES AND PROTOCOLS FOR ADVANCED NETWORKING (TISPAN); ANALYSIS OF LOCATION INFORMATION STANDARDS PRODUCED BY VARIOUS SDOS
    BS EN 16072:2015 Intelligent transport systems. ESafety. Pan-European eCall operating requirements
    NFP 99 255 : 2009 ROAD TRANSPORT AND TRAFFIC TELEMATICS - ESAFETY - THIRD PARTY SUPPORTED ECALL OPERATING REQUIREMENTS
    TS 102 744-3-9 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); FAMILY SL SATELLITE RADIO INTERFACE (RELEASE 1); PART 3: CONTROL PLANE AND USER PLANE SPECIFICATIONS; SUB-PART 9: INITIATION AND OPERATION OF USER PLANE
    DIN EN 16454 E : 2015 INTELLIGENT TRANSPORT SYSTEMS - ESAFETY - ECALL END TO END CONFORMANCE TESTING
    TR 103 502 : 1.1.1 RECONFIGURABLE RADIO SYSTEMS (RRS); APPLICABILITY OF RRS WITH EXISTING RADIO ACCESS TECHNOLOGIES AND CORE NETWORKS; SECURITY ASPECTS
    TS 102 221 : 13.0.0 SMART CARDS; UICC-TERMINAL INTERFACE; PHYSICAL AND LOGICAL CHARACTERISTICS (RELEASE 14)
    TS 102 424 : 1.1.1 TELECOMMUNICATIONS AND INTERNET CONVERGED SERVICES AND PROTOCOLS FOR ADVANCED NETWORKING (TISPAN); REQUIREMENTS OF THE NGN NETWORK TO SUPPORT EMERGENCY COMMUNICATION FROM CITIZEN TO AUTHORITY
    TS 101 863-3 : 1.1.2 DIGITAL ENHANCED CORDLESS TELECOMMUNICATIONS (DECT); DECT/UMTS INTERWORKING PROFILE (IWP); PART 3: 3,1 KHZ SPEECH SERVICE
    TS 102 181 : 1.2.1 EMERGENCY COMMUNICATIONS (EMTEL); REQUIREMENTS FOR COMMUNICATION BETWEEN AUTHORITIES/ORGANIZATIONS DURING EMERGENCIES
    TS 102 744-3-1 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); FAMILY SL SATELLITE RADIO INTERFACE (RELEASE 1); PART 3: CONTROL PLANE AND USER PLANE SPECIFICATIONS; SUB-PART 1: BEARER CONTROL LAYER INTERFACE
    TS 102 110-2 : 1.1.1 SERVICES AND PROTOCOLS FOR ADVANCED NETWORKS; NETWORK INTEGRATION TESTING OF UNIVERSAL MOBILE TELECOMMUNICATIONS SYSTEM (UMTS) WITH GLOBAL SYSTEM FOR MOBILE COMMUNICATION (GSM) PHASE 2+, PUBLIC SWITCHED TELEPHONE NETWORK (PSTN) AND INTEGRATED SERVICES DIGITAL NETWORK (ISDN); PART 2: ABSTRACT TEST SUITE (ATS) AND PARTIAL IMPLEMENTATION EXTRA INFORMATION FOR TESTING (PIXIT) PROFORMA
    DIN EN 16072:2015-08 Intelligent transport systems - ESafety - Pan-European eCall operating requirements
    TS 102 744-4-1 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); FAMILY SL SATELLITE RADIO INTERFACE (RELEASE 1); PART 4: ENHANCED SERVICES AND APPLICATIONS; SUB-PART 1: MULTIPLE VOICE SERVICES
    TS 101 376-4-13 : 3.4.1 GEO-MOBILE RADIO INTERFACE SPECIFICATIONS (RELEASE 3); THIRD GENERATION SATELLITE PACKET RADIO SERVICE; PART 4: RADIO INTERFACE PROTOCOL SPECIFICATIONS; SUB-PART 13: RADIO RESOURCE CONTROL (RRC) PROTOCOL; IU MODE; GMR-1 3G 44.118
    TS 103 328 : 1.2.1 RAILWAYS TELECOMMUNICATIONS (RT); GPRS/EGPRS REQUIREMENTS FOR EUROPEAN TRAIN CONTROL SYSTEM (ETCS)
    TS 101 376-4-12 : 3.4.1 GEO-MOBILE RADIO INTERFACE SPECIFICATIONS (RELEASE 3); THIRD GENERATION SATELLITE PACKET RADIO SERVICE; PART 4: RADIO INTERFACE PROTOCOL SPECIFICATIONS; SUB-PART 12: MOBILE EARTH STATION (MES) - BASE STATION SYSTEM (BSS) INTERFACE; RADIO LINK CONTROL/MEDIUM ACCESS CONTROL (RLC/MAC) PROTOCOL; GMR-1 3G 44.060
    TS 102 223 : 13.0.0 SMART CARDS; CARD APPLICATION TOOLKIT (CAT) (RELEASE 14)
    ETSI TS 102 223 V15.3.0:2019-07 SMART CARDS; CARD APPLICATION TOOLKIT (CAT) (RELEASE 15)
    TS 102 657 : 1.17.1 LAWFUL INTERCEPTION (LI); RETAINED DATA HANDLING; HANDOVER INTERFACE FOR THE REQUEST AND DELIVERY OF RETAINED DATA
    TS 101 376-3-10 : 3.3.1 GEO-MOBILE RADIO INTERFACE SPECIFICATIONS (RELEASE 3); THIRD GENERATION SATELLITE PACKET RADIO SERVICE; PART 3: NETWORK SPECIFICATIONS; SUB-PART 10: FUNCTIONS RELATED TO MOBILE EARTH STATION (MES) IN IDLE MODE; GMR-1 3G 43.022
    TS 102 250-5 : 2.4.2 SPEECH AND MULTIMEDIA TRANSMISSION QUALITY (STQ); QOS ASPECTS FOR POPULAR SERVICES IN MOBILE NETWORKS; PART 5: DEFINITION OF TYPICAL MEASUREMENT PROFILES
    TS 102 250-2 : 2.4.1 SPEECH AND MULTIMEDIA TRANSMISSION QUALITY (STQ); QOS ASPECTS FOR POPULAR SERVICES IN MOBILE NETWORKS; PART 2: DEFINITION OF QUALITY OF SERVICE PARAMETERS AND THEIR COMPUTATION
    EN 16072:2015 Intelligent transport systems - ESafety - Pan-European eCall operating requirements
    EN 16062:2015 Intelligent transport systems - ESafety - eCall high level application requirements (HLAP) using GSM/UMTS circuit switched networks
    TS 101 863-1 : 1.1.2 DIGITAL ENHANCED CORDLESS TELECOMMUNICATIONS (DECT); DECT/UMTS INTERWORKING PROFILE (IWP); PART 1: GENERAL DESCRIPTION AND OVERVIEW
    UNE-EN 16062:2015 Intelligent transport systems - ESafety - eCall high level application requirements (HLAP) using GSM/UMTS circuit switched networks
    UNE-EN 16072:2015 Intelligent transport systems - ESafety - Pan-European eCall operating requirements
    TS 102 112-2 : 1.1.1 SERVICES AND PROTOCOLS FOR ADVANCED NETWORKS (SPAN); NETWORK INTEGRATION TESTING BETWEEN IN, PLMN AND ISDN; PART 2: IMPLEMENTATION CONFORMANCE STATEMENT (ICS), PARTIAL IMPLEMENTATION EXTRA INFORMATION FOR TESTING (IXIT) PROFORMAS AND ABSTRACT TEST SUITE (ATS)
    BS EN 16062:2015 Intelligent transport systems. ESafety. eCall high level application requirements (HLAP) using GSM/UMTS circuit switched networks
    TS 102 744-3-8 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); FAMILY SL SATELLITE RADIO INTERFACE (RELEASE 1); PART 3: CONTROL PLANE AND USER PLANE SPECIFICATIONS; SUB-PART 8: NAS LAYER AND USER PLANE OPERATION FOR MBMS SERVICES
    I.S. EN 16072:2015 INTELLIGENT TRANSPORT SYSTEMS - ESAFETY - PAN-EUROPEAN ECALL OPERATING REQUIREMENTS
    TS 102 230-2 : 9.0.0 SMART CARDS; UICC-TERMINAL INTERFACE; PHYSICAL, ELECTRICAL AND LOGICAL TEST SPECIFICATION; PART 2: UICC FEATURES (RELEASE 9)
    UNI CEN/TS 16454 : 2013 INTELLIGENT TRANSPORT SYSTEMS - ESAFETY - ECALL END TO END CONFORMANCE TESTING
    GS SMT 001 : 2.1.1 SURFACE MOUNT TECHNOLOGY (SMT) REQUIREMENTS FOR EMBEDDED COMMUNICATION MODULES FOR MACHINE TO MACHINE COMMUNICATIONS
    TS 102 744-1-3 : 1.1.1 SATELLITE EARTH STATIONS AND SYSTEMS (SES); FAMILY SL SATELLITE RADIO INTERFACE (RELEASE 1); PART 1: GENERAL SPECIFICATIONS; SUB-PART 3: SATELLITE RADIO INTERFACE OVERVIEW

    Standards Referencing This Book - (Show below) - (Hide below)

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    ISO/IEC 10646:2014 Information technology Universal Coded Character Set (UCS)
    ISO/IEC 6429:1992 Information technology Control functions for coded character sets
    ETS 300 102-1 : 20001 INTEGRATED SERVICES DIGITAL NETWORK (ISDN); USER NETWORK INTERFACE LAYER 3 - SPECIFICATIONS FOR BASIC CALL CONTROL
    ETS 300 102-2 : 20001 INTEGRATED SERVICES DIGITAL NETWORK (ISDN); USER NETWORK INTERFACE LAYER 3 - SPECIFICATIONS FOR BASIC CALL CONTROL; SPECIFICATION DESCRIPTION LANGUAGE (SDL) DIAGRAMS
    ISO/IEC 646:1991 Information technology ISO 7-bit coded character set for information interchange
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