Content for TS 29.164 Word version: 18.0.0
1 Scope
2 References
3 Definitions and abbreviations
3.1 Definitions
3.2 Abbreviations
4 Network characteristics
4.1 Key characteristics of ISUP/BICC based CS Domain
4.2 Key characteristics of external SIP-I network
5 Interworking reference model
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1 Scope p. 6
The present document defines interworking procedures between a 3GPP CS domain (see TS 23.205) which applies either BICC or ISUP as signalling protocol, and external networks that use SIP-I (see ITU-T Q.1912.5 [20], Profile C) as signalling protocol. The document also describes the related interworking architecture. The control plane interworking is performed by an interworking unit at the interconnection between the 3GPP CS domain and an external SIP-I network. The user plane interworking is performed by an MGW. The present document defines stage 2 procedures for the control of the MGW.
The present specification reuses existing interworking procedures of TS 29.163 and ITU-T Q.1912.5 [20], Profile C, as far as possible.
2 References p. 6
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.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 23.205: "Bearer-independent circuit-switched core network; Stage 2".
[3]
TS 26.102: "Adaptive Multi-Rate (AMR) speech codec; Interface to Iu and Uu".
[4]
TS 29.163: "Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks".
[5]
TS 29.205: "Application of Q.1900 series to Bearer Independent CS Network architecture; Stage 3".
[6]
TS 29.332: "Media Gateway Control Function (MGCF) - IM-Media Gateway (IM-MGW) interface, Stage 3".
[7]
TS 29.414: "Core network Nb data transport and transport signalling".
[8]
TS 29.415: "Core network Nb interface user plane protocols".
[9]
ITU-T Recommendation E.164 (05/1997): "The international public telecommunication numbering plan".
[10]
ITU-T Recommendation G.711 (11/98): "Pulse Code Modulation (PCM) of voice frequencies".
[11]
ITU-T Recommendation H.248.1 (05/02): "Gateway control protocol: Version 2".
[12]
ITU-T Recommendation I.363.5 (1996): "B-ISDN ATM Adaptation Layer specification: Type 5 AAL".
[13]
ITU-T Recommendation Q.701 (03/93), Q.702 (11/88), Q.703 (07/96), Q.704 (07/96), Q.705 (03/93), Q.706 (03/93), Q.707 (11/88), Q.708 (03/99), Q.709 (03/93): "Functional description of the message transfer part (MTP) of Signalling System No. 7".
[14]
ITU-T Recommendation Q.730 (12/99), Q.731.1 (07/96), Q.731.3 (03/93), Q.731.4 (03/93), Q.731.5 (03/93), Q.731.6 (03/93), Q.731.7 (06/97), Q.731.8 (02/92), Q.732.5-2 (12/99), Q.732.7 (07/96), Q.733.1 (02/92), Q.733.2 (03/93), Q.733.3 (06/97), Q.733.4 (03/93), Q.733.5 (12/99), Q.734.1 (03/93), Q.734.2 (07/96), Q.735.1 (03/93), Q.735.3 (03/93), Q.735.6 (07/93), Q.736.1 (10/95), Q.736.3 (10/95), Q.737.1 (06/97): "ISDN user part supplementary services".
[15]
ITU-T Recommendations Q.761 to Q.764 (12/99): "Signalling System No.7 ISDN User Part".
[16]
ITU-T Recommendation Q.765 (2000): "Signalling System No. 7 - Application transport mechanism".
[17]
ITU-T Recommendation Q.765.5 (2000): "Signalling system No. 7 - Application transport mechanism: Bearer Independent Call Control (BICC)".
[18]
ITU-T Recommendation Q.850 (1998): "Usage of cause and location in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN User Part".
[19]
ITU-T Recommendations Q.1902.1 to Q.1902.6 (07/2001): "Bearer Independent Call Control".
[20]
ITU-T Recommendation Q.1912.5 (03/04): "Interworking between Session Initiation Protocol (SIP) and Bearer Independent Call Control Protocol or ISDN User Part".
[21]
ITU-T Recommendation Q.2110 (1994): "B-ISDN ATM adaptation layer - Service Specific Connection Oriented Protocol (SSCOP)".
[22]
ITU-T Recommendation Q.2140 (1995): "B-ISDN ATM adaptation layer - Service specific coordination function for signalling at the network node interface (SSCF AT NNI)".
[23]
ITU-T Recommendation Q.2210 (1996): "Message transfer part level 3 functions and messages using the services of ITU-T Recommendation Q.2140".
[24]
RFC 791: "Internet Protocol".
[25]
RFC 768: "User Datagram Protocol".
[26]
RFC 793: "Transmission Control Protocol".
[27]
RFC 2460: "Internet Protocol, Version 6 (IPv6) Specification"
[28]
RFC 4733: "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals".
[29]
RFC 2960: "Stream Control Transmission Protocol".
[30]
RFC 2976: "The SIP INFO Method".
[31]
RFC 3204: "MIME media types for ISUP and QSIG Objects".
[32]
RFC 3261: "SIP: Session Initiation Protocol".
[33]
RFC 3262: "Reliability of provisional responses".
[34]
RFC 3264: "An Offer/Answer Model with the Session Description Protocol (SDP)".
[40]
RFC 3311: "SIP UPDATE method".
[35]
RFC 3312: "Integration of Resource Management and Session Initiation Protocol (SIP)".
[36]
RFC 3550: "RTP: A Transport Protocol for Real-Time Applications".
[37]
TS 29.202: "Core Signalling System No. 7 (SS7) signalling transport in core network; Stage 3".
[38]
TS 29.231: "Application of SIP-I Protocols to Circuit Switched (CS) core network architecture; Stage 3".
[39]
TS 29.235: "Interworking between the 3GPP CS domain with SIP-I as signalling protocol and other networks".
3 Definitions and abbreviations p. 8
3.1 Definitions p. 8
For the purposes of the present document, the terms and definitions given in TR 21.905, in TS 29.163, in ITU-T E.164 [9], in ITU-T Q.1912.5 [20] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in any other of the specifications listed above.
Interworking Unit (IWU):
Logical entity that interworks SIP-I signalling with BICC or ISUP signalling in the 3GPP CS Domain.
Incoming Interworking Unit (I IWU):
Logical entity that terminates incoming calls from the external SIP-I network side and originates outgoing calls towards the CS Domain side using the BICC or ISUP protocols.
Outgoing Interworking Unit (O IWU):
Logical entity that terminates incoming BICC or ISUP calls from the CS Domain side and originates outgoing calls towards external SIP-I network.
External SIP-I signalling function:
function in the external network, which has the capabilities to process SIP with encapsulated ISUP messages.
For references to TS 29.163 procedures within the present specification, the MGCF in TS 29.163 is to be understood as IWU. The IM-MGW is to be understood as MGW. The Mn interface is to be understood as interface between IWU and MGW. The IM CN subsystem is to be understood as external SIP-I network. The CS network is to be understood as 3GPP CS domain.
3.2 Abbreviations p. 8
For the purposes of the present document, the abbreviations given in TR 21.905, in TS 29.163, in ITU-T E.164 [9], in ITU-T Q.1912.5 [20], and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in any other of the specification listed above.
IW-MGW
Interworking Media Gateway Function
4 Network characteristics p. 8
4.1 Key characteristics of ISUP/BICC based CS Domain p. 8
The 3GPP CS domain uses either BICC Capability Set 2 (see ITU-T Q.1902.1 to Q.1902.6 [19] and Q.765.5 [17]) with 3GPP specific extensions, as specified for the 3GPP Nc interface in TS 29.205, or ISUP (see ITU-T Q.761 to Q.764 [15]), as signalling protocol.
If BICC is used as signalling protocol, the 3GPP Nb interface, as specified in TS 29.414 and TS 29.415, is used for the user plane transport. If ISUP is applied as signalling protocol, TDM transport of the user plane is applied.
4.2 Key characteristics of external SIP-I network p. 8
The external SIP-I network applies SIP, RFC 3261, with ISUP encapsulated according to RFC 3204, as specified in ITU-T Q.1912.5 [20] Profile C. The SIP Signalling Profile defined for Profile C in Annex C of Q.1912.5 [20] is applied.
The network uses either IPv4 (RFC 791) or IPv6 (RFC 2460).
For the transport of most media, RTP (RFC 3550) over UDP (RFC 768) is applied.
For the transport of control signalling, UDP (RFC 768), TCP (RFC 793) or SCTP (RFC 2960) can be used.
5 Interworking reference model p. 9
Figure 5.1 details the interworking reference model for the present specification
