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Content for  TS 24.279  Word version:  16.0.0

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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.
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2  References

The following documents contain provisions that, 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: "3G Vocabulary".
[2]
TS 22.279: "Combined CS Calls and IMS Sessions".
[3]
TS 23.279: "Combining CS and IMS services".
[4]
TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".
[5]
TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
[6]
RFC 3840:  "Indicating User Agent Capabilities in the Session Initiation Protocol".
[7]
TS 22.081: "Line Identification; Service description - Stage 1".
[8]
TS 22.087: "User-to-User Signalling (UUS); Service description - Stage 1".
[9]
TS 24.087: "User-to-User Signalling (UUS) Supplementary Service - Stage 3".
[10]
TS 24.247: "Messaging service using the IP Multimedia (IM) Core Network; Stage 3".
[11]
TS 24.228: Release 5: "Signalling flows for the IP multimedia call control based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
[12]
TS 33.203: "3G security; Access security for IP-based services".
[13]
TS 26.141: "IP Multimedia System (IMS) Messaging and Presence; Media formats and codecs".
[14]
RFC 3264:  "An Offer/Answer Model with Session Description Protocol (SDP)".
[15]
TS 29.162: "Interworking between the IM CN subsystem and IP networks".
[16]
TS 29.328: "IP Multimedia (IM) Subsystem Sh interface".
[17]
RFC 3261:  "SIP: Session Initiation Protocol".
[18]
RFC 7433:  "A Mechanism for Transporting User-to-User Call Control Information in SIP".
[19]
RFC 7434:  "Interworking ISDN Call Control User Information with SIP".
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3  Definitions, symbols and abbreviationsWord‑p. 8

3.1  Definitions

For the purposes of the present document, the following terms and definitions are given in TS 22.279.
Combinational Service
Combinational call
Combinational Session
CSICS capable UE
For the purposes of the present document, the following terms and definitions are given in TS 23.279.
CSI session
Multimedia IMS session
CSI origination
CSI termination
IMS origination
IMS termination
For the purposes of the present document, the following terms and definitions given in TR 21.905 apply:
Universal Subscriber Identity Module (USIM)
User Equipment (UE)
For the purposes of the present document, the following terms and definitions given in TS 33.203 apply:
IM Subscriber Identity Module (ISIM)
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3.2  Abbreviations

For the purposes of the present document, the abbreviations defined in TR 21.905 and the following abbreviations apply:
CSICS
Circuit Switched IMS Combinational Service

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