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TS 23.172 (CT3)
Technical Realization of Circuit Switched (CS) Multimedia Service UDI/RDI Fallback and Service Modification – Stage 2

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(P) V14.0.0    2017/03    61 p.
(P) V13.0.0    2015/12    61 p.
(P) V12.0.0    2014/10    61 p.
(P) V11.0.0    2012/09    61 p.
(P) V10.0.1    2011/04    61 p.
(P) V9.0.0    2009/12    61 p.
(P) V8.0.0    2008/12    61 p.
(P) V7.0.0    2007/06    61 p.
(P) V6.4.0    2006/03    61 p.
(P) V5.6.0    2005/06    44 p.

Rapporteur:  Mrs. Biondic, Nevenka
See also:  –

This service is available to UDI/RDI multimedia calls and allows users to achieve successful call establishment when end to end circuit-switched (CS) multimedia is not possible (fallback to speech) or when signalling of the feature is not possible in the network (fallback to preferred service or speech). Furthermore, it allows the users to swap between a multimedia service and basic speech during an established call.


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1   Scope [R5]   PDF-p. 6
2   References [R5]
3   Definitions and abbreviations [R5]   PDF-p. 7
4   Service change and fallback for UDI/RDI multimedia [R5]
4.1   General Requirements
4.2   Access Call Control Signalling   PDF-p. 8
4.3   Core Network procedures   PDF-p. 22
5   Lawful Interception [R5]   PDF-p. 58      Up
A   Change history   PDF-p. 59

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