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TR 24.879
Combining Circuit-Switched (CS) calls and
IP Multimedia Subsystem (IMS) sessions

3GPP‑Page   ToC  
V7.0.0 (Wzip)  2006/03  73 p.
Mr. Dawes, Peter

full Table of Contents for  TR 24.879  Word version:  7.0.0

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1  ScopeWord‑p. 7

The present document provides the technical realisation for the combination of Circuit Switched calls and IM sessions when using them simultaneously between the same two users.
The present document describes the use of CS and IM services in combination, using the existing procedures that have been defined for CS and IMS. It includes the necessary function as adding an IM session to an ongoing CS call, adding a CS call to an ongoing IM session, supplementary services as they relate to CSICS and supporting capability exchange.
The present document is applicable to UE and Application Servers providing for the combination of Circuit Switched calls and IM sessions.

2  ReferencesWord‑p. 7

3  Definitions, symbols and abbreviationsWord‑p. 8

3.1  DefinitionsWord‑p. 8

3.2  AbbreviationsWord‑p. 8

4  Common capability information and identifiers for CS-first and IMS-first scenariosWord‑p. 8

5  Common procedures for CS-first and IMS-first scenariosWord‑p. 9

6  Combining a CS call with an existing IM sessionWord‑p. 10

7  Combining an IM session with an existing CS callWord‑p. 14

8  Interaction with supplementary servicesWord‑p. 17

A (Normative)  Media feature tags defined within the current documentWord‑p. 17

B  Example signalling flows for the combining of CS calls with IM sessionsWord‑p. 18

C  Proposed changes to 3GPP TS 24.008 [4]Word‑p. 55

X (Normative)  3GPP capability exchange protocolWord‑p. 61

D  Proposed changes to 3GPP TS 24.229 [5]Word‑p. 66

$  Change historyWord‑p. 72

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