Content for TS 29.162 Word version: 18.1.0

1… 4…

3.1 Definitions 3.2 Symbols 3.3 Abbreviations
...

1 Scope p. 7

The IM CN subsystem interworks with the external IP networks through the Mb reference point.

This document details the interworking between the IM CN subsystem and external IP networks for IM service support. It addresses the issues of control plane interworking and, user plane interworking for specific interworking use cases. Clause 10 describes the IMS-Ix interface requirements in the form of Use Cases which require H.248 protocol procedures. Subclause 10.4 then details the additional Information Elements required to perform the specific procedures.

The IP version Interworking, between IP version 4 (IETF RFC 791) and IP version 6 (IETF RFC 2460) detailed in terms of the processes and protocol mappings required in order to support both IMS originated and terminated calls.

2 References p. 7

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]

TS 24.229: "Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".

[2]

RFC 3261: "SIP: Session Initiation Protocol".

[3]

TS 23.221: "Architectural requirements".

[4]

TS 29.061: "Interworking between the Public Land Mobile Network (PLMN) supporting packet based services and Packet Data Networks (PDN)".

[5]

TS 23.002: "Network architecture".

[6] Void.

[7]

TR 21.905: "Vocabulary for 3GPP Specifications".

[8]

TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".

[9]

RFC 791: "Internet Protocol".

[10]

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

[11]

RFC 2766: "Network Address Translation - Protocol Translation (NAT-PT)".

[12]

RFC 2663: "IP Network Address Translator (NAT) Terminology and Considerations".

[13]

TR 29.962: version 6.1.0 "Signalling interworking between the 3GPP profile of the Session Initiation Protocol (SIP) and non-3GPP SIP usage".

[14] Void.

[15] Void.

[16] Void.

[17] Void.

[18]

RFC 792: "Internet Control Message Protocol".

[19]

RFC 2463: "Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6".

[20] Void.

[21] Void.

[22] Void.

[23] Void.

[24] Void.

[25]

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

[26]

ITU-T Recommendation H.248.1 (05): "Gateway Control Protocol: Version 3".

[27] Void.

[28]

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

[29]

TS 29.235: "Interworking between SIP-I based circuit-switched core network and other networks".

[30] Void.

[31]

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

[32]

TS 33.328: "IMS Media Plane Security".

[33]

RFC 4568: "Session Description Protocol (SDP) Security Descriptions for Media Streams".

[34]

RFC 3711: "The Secure Real-time Transport Protocol (SRTP)".

[35]

RFC 5124: "Extended Secure RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/SAVPF)".

[36]

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

[37]

RFC 3168: "The Addition of Explicit Congestion Notification (ECN) to IP".

[38]

RFC 6679: "Explicit Congestion Notification (ECN) for RTP over UDP".

[39]

TS 29.079: "Optimal Media Routeing within the IP Multimedia Subsystem; Stage 3".

[40]

TS 29.165: "Inter-IMS Network to Network Interface (NNI)".

[41]

TS 23.237: "IP Multimedia subsystem (IMS) Service Continuity; Stage 2".

[42]

TS 24.237: "IP Multimedia subsystem (IMS) Service Continuity; Stage 3".

[43]

TS 23.334: "IP Multimedia Subsystem (IMS) Application Level Gateway (IMS-ALG) - IMS Access Gateway (IMS-AGW) interface: Procedures descriptions".

[44]

TS 22.153: "Multimedia Priority Service".

[45]

RFC 5285: "A General Mechanism for RTP Header Extensions".

[46]

RFC 6236: "Negotiation of Generic Image Attributes in the Session Description Protocol (SDP)".

[47]

RFC 4975: "The Message Session Relay Protocol (MSRP)".

[48]

RFC 6714: "Connection Establishment for Media Anchoring (CEMA) for the Message Session Relay Protocol (MSRP)".

[49]

RFC 4583: "Session Description Protocol (SDP) Format for Binary Floor Control Protocol (BFCP) Streams".

[50] Void.

[51]

RFC 6947: "The Session Description Protocol (SDP) Alternate Connectivity (ALTC) Attribute".

[52]

TS 26.441: "Codec for Enhanced Voice Services (EVS); General Overview".

[53]

TS 26.445: "Codec for Enhanced Voice Services (EVS); Detailed Algorithmic Description".

[54]

RFC 4573: "MIME Type Registration for RTP Payload Format for H.224".

[55]

ITU-T Recommendation H.224 (01/2005): "A real time control protocol for simplex applications using the H.221 LSD/HSD/MLP channels".

[56]

ITU-T Recommendation H.281 (11/1994): "A far end camera control protocol for videoconferences using H.224".

[57]

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

[58]

RFC 5009: "Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for Authorization of Early Media".

[59]

RFC 7728: "RTP Stream Pause and Resume".

[60]

RFC 4585: "Extended RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/AVPF)".

[61]

RFC 5104: "Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF)".

[62]

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

[63]

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

[64]

TS 26.250: "Codec for Immersive Voice and Audio Services - General Overview".

[65]

TS 26.253: "Codec for Immersive Voice and Audio Services - Detailed Algorithmic Description incl. RTP payload format and SDP parameter definitions".

3 Definitions, symbols and abbreviations p. 9

3.1 Definitions p. 9

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

End-to-end security:

media protection between two IMS UEs without being terminated by any intermediary node.

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.

IM CN subsystem:

(IP Multimedia CN subsystem) comprises of all CN elements for the provision of IP multimedia applications over IP multimedia sessions

IP multimedia session:

set of multimedia senders and receivers and the data streams flowing from senders to receivers. IP multimedia sessions are supported by the IP multimedia CN Subsystem and are enabled by IP connectivity bearers (e.g. GPRS as a bearer). A user may invoke concurrent IP multimedia sessions.

MSC Server enhanced for ICS:

An MSC Server that supports the network based ICS functionality.

MSC Server enhanced for SRVCC:

An MSC Server that supports the network based SRVCC functionality.

3.2 Symbols p. 10

For the purposes of the present document, the following symbols apply:

Reference Point between a CSCF/BGCF/IMS-ALG and an IP multimedia network.

Reference Point between a CSCF/BGCF/MSC Server enhanced for ICS/MSC Server enhanced for SRVCC and IBCF.

Reference Point defined in TS 23.002 and is IP based.

Reference Point between IBCF and TrGW or CS-IBCF and CS-TrGW.

3.3 Abbreviations p. 10

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.

ALTC

ALTernative Connection

APP

APPlication-defined RTCP packet

ATCF

Access Transfer Control Function

ATGW

Access Transfer Gateway

B2BUA

Back-to-Back User Agent

BFCP

Binary Floor Control Protocol

BGCF

Breakout Gateway Control Function

CCM

Codec Control Messages

CS-TrGW

CS (domain) TrGW

CVO

Coordination of Video Orientation

DBI

Delay Budget Information

DRVCC

Dual Radio Voice Call Continuity

ECN

Explicit Congestion Notification

ECN-CE

ECN Congestion Experienced

EVS

Enhanced Voice Services

FECC

Far End Camera Control

FIR

Full Intra Request

IBCF

Interconnect Border Control Function

ICE

Interactive Connectivity Establishment

ICS

IMS Centralized Services

I-CSCF

Interrogating CSCF

IMS-ALG

IMS - Application Level Gateway

ITU-T

International Telecommunication Union - Telecommunication Standardization Sector

IVAS

Immersive Voice and Audio Services

MboIP

Mb over IP

MPS

Multimedia Priority Service

MRFP

Multimedia Resource Function Processor

MSRP

Message Session Relay Protocol

MTSI

Multimedia Telephony Service for IMS

NAT/NAPT

Network Address Translation / Network Address and Port Translation

NA (P) T-PT

Network Address (and Port) Translation - Protocol Translation

OMR

Optimal Media Routeing

P-CSCF

Proxy CSCF

ROI

Region of Interest

RTCP

Real Time Control Protocol

SCTP

Stream Control Transmission Protocol

SDPCapNeg

SDP Capability Negotiation

SIP UA

SIP User Agent

STUN

Session Traversal Utilities for NAT

THIG

Topology Hiding Internetwork Gateway

TLS

Transport Layer Security

TMMBN

Temporary Maximum Media Stream Bit Rate Notification

TMMBR

Temporary Maximum Media Stream Bit Rate Request

TRF

Transit and Roaming Function

TrGW

Transition GateWay

UAC

User Agent Client

UAS

User Agent Server

URN

Uniform Resource Name

WAN

Wide Area Network