Content for TS 29.235 Word version: 17.0.0

1 Scope p. 10

The present document specifies the interworking between SIP-I based circuit-switched core network, as specified in TS 23.231 and TS 29.231, with out-of-band transcoder control related procedures in TS 23.153, and:

an external SIP-I based signalling network compliant to ITU-T Recommendation Q.1912.5 [6],
an ISUP (ITU-T Recommendations Q.761 to Q.764 [7]) based network such as an ISUP based 3GPP CS Domain or a PSTN,
a BICC (ITU-T Recommendations Q.1902.1 to Q.1902.6 [8]) based network such as an BICC based 3GPP CS Domain as specified in TS 23.205 and TS 29.205,
an IP Multimedia Subsystem, as specified in TS 23.228 and TS 24.229.

2 References p. 10

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 23.002: "Network architecture".

[3]

TS 23.231: " SIP-I based circuit-switched core network; Stage 2".

[4]

TS 29.231: "Application of SIP-I Protocols to Circuit Switched (CS) core network architecture; Stage 3".

[5]

TS 23.153: "Out of Band Transcoder Control; Stage 2".

[6]

ITU-T Recommendation Q.1912.5 (03/04): "Interworking between Session Initiation Protocol (SIP) and Bearer Independent Call Control Protocol or ISDN User Part".

[7]

ITU-T Recommendations Q.761 to Q.764 (12/99): "Specifications of Signalling System No.7 ISDN User Part (ISUP)".

[8]

ITU-T Recommendations Q.1902.1 to Q.1902.6 (07/01): "Bearer Independent Call Control".

[9]

TS 23.205: "Bearer-independent circuit-switched core network; Stage 2".

[10]

TS 29.205: "Application of Q.1900 series to Bearer Independent CS Network architecture; Stage 3".

[11]

TS 23.228: "IP Multimedia subsystem (IMS)".

[12]

TS 24.229: "IP Multimedia Call Control Protocol based on SIP and SDP".

[13]

TS 29.163: "Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks".

[14]

RFC 791: "Internet Protocol".

[15]

RFC 768: "User Datagram Protocol".

[16]

RFC 793: "Transmission Control Protocol".

[17]

RFC 2460: "Internet Protocol, Version 6 (IPv6) Specification".

[18]

RFC 4960: "Stream Control Transmission Protocol".

[19]

RFC 3204: "MIME media types for ISUP and QSIG Objects".

[20]

RFC 3261: "SIP: Session Initiation Protocol".

[21]

RFC 3262: "Reliability of Provisional Responses in the Session Initiation Protocol (SIP)".

[22]

RFC 3264: "An Offer/Answer Model with the Session Description Protocol (SDP)".

[23]

RFC 3312: "Integration of Resource Management and Session Initiation Protocol (SIP)".

[24]

TS 23.014: "Support of Dual Tone Multi-Frequency (DTMF) signalling".

[25]

TS 24.629: "Explicit Communication Transfer (ECT) using IP Multimedia (IM) Core Network (CN) subsystem".

[26]

TS 24.610: "Communication HOLD (HOLD) using IP Multimedia (IM) Core Network (CN) subsystem".

[27]

ITU-T Recommendation Q.765 (2000): "Signalling System No. 7 - Application transport mechanism".

[28]

ITU-T Recommendation Q.765.5 (2000): "Signalling system No. 7 - Application transport mechanism: Bearer Independent Call Control (BICC)".

[29]

TS 29.238: "Interconnection Border Control Functions - Transition Gateway; H.248 Profile; Stage 3".

[30]

RFC 3263: "Session Initiation Protocol (SIP): Locating SIP Servers".

[31]

RFC 4028: "Session Timers in the Session Initiation Protocol (SIP)".

[32]

RFC 3325: "Private Extensions to the Session Initiation Protocol (SIP) for Asserted Identity within Trusted Networks".

[33]

ITU-T Recommendation H.248.1 (2002): "Gateway control protocol: Version 3".

[34] Void.

[35] Void.

[36]

RFC 5079: "Rejecting Anonymous Requests in the Session Initiation Protocol (SIP)".

[37]

TS 29.162: "Interworking between the IM CN subsystem and IP networks".

[38]

RFC 3550: "RTP: A Transport Protocol for Real-Time Applications".

[39]

RFC 3556: "Session Description Protocol (SDP) Bandwidth Modifiers for RTP Control Protocol (RTCP) Bandwidth".

[40]

RFC 3605: "Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP)".

[41]

RFC 2474: "Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers".

[42]

RFC 2216 (1997): "Network Element Service Template".

[43]

TS 29.414: "Core network Nb data transport and transport signalling".

[44]

TS 32.407: "Telecommunication Management; Performance Management (PM) Performance measurements Core Network (CN) Circuit Switched (CS) domain".

[45]

TS 23.226: "Global Text Telephony (GTT); stage 2".

[46]

ITU-T Recommendation T.140 (02/98): "Text conversation presentation protocol".

[47]

RFC 4103: "RTP Payload for Text Conversation".

[48]

ITU-T Recommendation V.18 (11/00): "Operational procedures for modems in the text telephone mode".

[49]

TS 26.226: "Cellular text telephone modem; General description".

[50] Void.

[51] Void.

[52]

TS 26.114: "IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and interaction".

[53]

ITU-T Recommendation H.248.1 (05/2002): "Gateway control protocol: Version 2" including the Corrigendum1 for Version 2 (03/04).

[54]

TS 29.332: "Media Gateway Control Function (MGCF) - IM-Media Gateway (IM-MGW) interface, Stage 3".

[55]

TS 29.232: "Media Gateway Controller (MGC) - Media Gateway (MGW) interface; Stage 3".

[56] Void.

[57]

RFC 5939: "Session Description Protocol (SDP) Capability Negotiation".

[58]

RFC 8445: "Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal".

[59]

RFC 8839: "Session Description Protocol (SDP) Offer/Answer Procedures for Interactive Connectivity Establishment (ICE)".

3 Definitions and abbreviations p. 12

3.1 Definitions p. 12

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply:

ICE lite:

The lite implementation of the Interactive Connectivity Establishment (ICE) specified in IETF RFC 8445.

Full ICE:

The full implementation of the Interactive Connectivity Establishment (ICE) specified in IETF RFC 8445.

Interworking Unit (IWU):

Logical entity that interworks SIP-I signalling in the 3GPP CS Domain with any of the following signalling: (a) SIP-I signalling of an external SIP-I network, (b) ISUP signalling of a PSTN, and (c) BICC or ISUP signalling of a 3GPP CS Domain.

User Plane Interworking Unit (UP-IWU):

Logical entity that performs user plane interworking between the SIP-I based CS Domain and an external SIP-I network, or external ISUP network, or BICC/ISUP based 3GPP CS network.

3.2 Abbreviations p. 13

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.

ALG

Application Level Gateway

ANM

ANswer Message

APM

Application Transport Mechanism

B2BUA

(SIP) Back-to-Back User Agent

BGCF

Breakout Gateway Control Function

BICC

Bearer Independent Call Control

CON

Connect message

COT

Continuity message

CPG

Call ProGress message

CS-IBCF

CS (domain) IBCF

CS-TrGW

CS (domain) TrGW

IBCF

Interconnection Border Control Function

ICE

Interactive Connectivity Establishment

ITU-T

International Telecommunication Union - Telecommunication Standardization Sector

IM-MGW

IP Multimedia Media Gateway Function

IW-MSC

Interworking MSC

MIME

Multi-purpose Internet Mail Extensions

MRFP

Multimedia Resource Function Processor

NA(P)T

Network Address Translation / Network Address and Port Translation

NNI

Network to Network Interface

O-MSC

Originating MSC

OoB

Out of Band

OoBTC

Out of Band Transcoder Control

RES

RESume

RLC

Release Complete

SCTP

Stream Control Transmission Protocol

SDPCapNeg

SDP Capability Negotiation

SIP-I

SIP with encapsulated ISUP

STUN

Session Traversal Utilities for NAT

SUS

SUSpend

TDM

Time-Division Multiplexing

THIG

Topology Hiding Internetwork Gateway

TMR

Transmission Medium Requirement

TrGW

Transition Gateway

(SIP) User Agent

UP-IWU

User Plane Interworking Unit

USI

User Service Information