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TS 24.147 (CT1)
Conferencing using IMS – Stage 3

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(P) V14.1.0    2017/06    211 p.
(P) V13.2.0    2017/06    211 p.
(P) V12.7.0    2017/06    211 p.
(P) V11.4.0    2014/12    210 p.
(P) V10.5.0    2014/12    210 p.
(P) V9.5.0    2014/12    210 p.
(P) V8.5.0    2014/09    210 p.
(P) V7.11.0    2014/09    226 p.
(P) V6.9.0    2008/06    202 p.

Rapporteur:  Mr. Mayer, Georg
See also:  –

This TS provides the protocol details for conferencing within the IP Multimedia Core Network subsystem (IMS) based on the Session Initiation Protocol (SIP), SIP Events, the Session Description Protocol (SDP) and the Binary Floor Control Protocol (BFCP).

The functionalities for conference policy control (with respective standardised protocols) are felt to be essential for a complete IMS conferencing service but are not specified in this version of IMS conferencing and are for further study.

This TS does not cover the signalling between a MRFC and a MRFP.

Where possible, the present document specifies the requirements for this protocol by reference to specifications produced by the IETF within the scope of SIP, SIP Events, SDP and BFCP, either directly, or as modified by TS 24.229. Where this is not possible, extensions to SIP are defined within the present document. The document has therefore been structured in order to allow both forms of specification.

This TS is applicable to Application Servers (ASs), Multimedia Resource Function Controllers (MRFCs), Multimedia Resource Function Processors (MRFP), Media Gateway Control Functions (MGCFs) and to User Equipment (UE) providing conferencing capabilities.


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1   Scope [R6]   PDF-p. 7
2   References [R6]
3   Definitions, symbols and abbreviations [R6]   PDF-p. 9
4   Conferencing overview [R6]
5   Protocol using SIP and SIP events for conferencing [R6]   PDF-p. 12
5.1   Introduction
5.2   Functional entities
5.3   Role
5.3.1   Conference Participant
5.3.2   Conference Focus
5.3.3   Conference Notification Service   PDF-p. 23
6   Protocol using SDP for conferencing [R6]
7   Void
8   Protocol for floor control for conferencing [R7]   PDF-p. 25
A   Example signalling flows of conferencing operation [R6]   PDF-p. 27
A.1   Scope of signalling flows
A.2   Introduction
A.3   Flows demonstrating the creation of a conference   PDF-p. 29
A.4   Flows demonstrating a user joining a conference   PDF-p. 85
A.5   Flows demonstrating a user subscribing to the conference event package
A.6   Flows demonstrating a user leaving a conference   PDF-p. 193
A.7   Flows demonstrating conference termination   PDF-p. 202
A.8   Flows demonstrating usage of hold and resume during conferences
A.9   Flows demonstrating the use of the Replaces header [R7]   PDF-p. 203
B   Change history   PDF-p. 208

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