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Content for  TS 23.231  Word version:  17.0.0

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1  Scopep. 9

The present document defines the stage 2 description for the SIP-I based CS core network. The logical architecture for the SIP-I based CS core network is defined in TS 23.205.
This stage 2 shall cover the information flows between the GMSC server, MSC server and media gateways that are required to support a SIP-I based Nc interface. Note that nothing in the present document shall preclude an implementation of a combined MSC Server and MGW. The present document shall show the CS core network termination of the Iu and A interfaces in order to cover the information flow stimulus to the core network and describe the interaction with the supplementary and value added services and capabilities.
For the purposes of the present document, the Nc interface profile is based on ITU-T Q.1912.5 [9] SIP-I profile C and is specified in TS 29.231. The Mc interface profile is based on ITU-T H.248.1 [5] and is specified in TS 29.232.
Local Call Local Switch (LCLS) functionality is further specified in TS 23.284.
The present document is applicable only for IP transport in the CS core network.
Details of Transcoder-Free Operation/Out of Band Transcoder Control are outside the scope of the present document. See TS 23.153 for more information.
The present document specifies functions, procedures and information which apply to GERAN Iu mode. However, functionality related to GERAN Iu mode is neither maintained nor enhanced.

2  Referencesp. 9

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 23.002: "Network architecture".
TS 23.153: "Out of Band Transcoder Control; Stage 2".
TS 29.231: "Application of SIP-I Protocols to Circuit Switched (CS) core network architecture; Stage 3".
ITU-T Recommendation H.248.1: "Gateway control protocol".
TS 29.007: "General requirements on Interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)".
TS 23.205: "Bearer-independent circuit-switched core network; Stage 2".
TS 29.232: "Media Gateway Controller (MGC) - Media Gateway (MGW) interface; Stage 3".
ITU-T Recommendation Q.1912.5: "Interworking between Session Initiation Protocol (SIP) and Bearer Independent Call Control protocol or ISDN User Part".
RFC 3966:  "The tel URI for Telephone Numbers".
TS 23.108: "Mobile radio interface layer 3 specification core network protocols; Stage 2 (structured procedures)".
TS 48.008: "Mobile Switching Centre - Base Station system (MSC-BSS) interface; Layer 3 specification".
TS 23.009: "Handover procedures".
TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".
RFC 3261:  "SIP: Session Initiation Protocol".
RFC 4028:  "Session Timers in the Session Initiation Protocol (SIP)".
RFC 2976:  "The SIP INFO method".
RFC 3311:  "The Session Initiation Protocol (SIP) UPDATE Method".
RFC 3262:  "Reliability of Provisional Responses in the Session Initiation Protocol (SIP)".
TS 23.172: "Technical realization of Circuit Switched (CS); multimedia service UDI/RDI fallback and service modification; Stage 2".
TS 29.235: "Interworking between SIP-I based circuit-switched core network and other networks".
TS 25.415: "UTRAN Iu Interface User Plane Protocols".
TS 29.414: "Core Network Nb Data Transport and Transport Signalling".
RFC 4733:  "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals".
RFC 3264:  "An Offer/Answer Model with the Session Description Protocol (SDP)".
RFC 3312:  "Integration of Resource Management and Session Initiation Protocol (SIP)".
TS 23.014: "Support of Dual Tone Multi Frequency (DTMF) signalling".
TS 23.003: "Numbering, addressing and identification".
RFC 4715:  "The Integrated Services Digital Network (ISDN) Subaddress Encoding Type for tel URI".
TS 31.102: "Characteristics of the Universal Subscriber Identity Module (USIM) application".
TS 23.284: "Local Call Local Switch; Stage 2".
TS 29.163: "Interworking between the IM CN subsystem and CS networks - Stage 3".

3  Definitions, symbols and abbreviationsp. 10

3.1  Definitionsp. 10

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2  Symbolsp. 11

For the purposes of the present document, the following symbols apply:
Interface between the RNS and the core network. It is also considered as a reference point.
Interface between the server and the media gateway.
Interface between media gateways.
The NNI call control interface between (G)MSC servers.

3.3  Abbreviationsp. 11

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
Bearer Control Function
Bearer Independent Call Control
Bearer Independent Core Network
Circuit Switched
Digital Signal Processing
GSM/EDGE Radio Access Network
(Gateway) MSC Server
Initial Address Message
Internet Engineering Task Force
Internet Protocol
IP Bearer Control Protocol
Interworking Function
Local Call Local Switch
Media Gateway Control Function
Media Gateway
MSC Server
IWF at call control layer toward external network (see TS 29.007)
Network-Network interface
Out of Band Transcoder Control
Provisional Response Acknowledgement
Remote Transcoder Operation
Real-Time Transport Protocol
Stream Control Transmission Protocol
Service Change and UDI Fallback
Session Initiation Protocol
Session Description Protocol
Transmission Control Protocol
Time-Division Multiplexing
Tandem Free Operation
Transcoder Free Operation
User Datagram Protocol
UMTS Terrestrial Radio Access Network

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