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Content for  TS 23.206  Word version:  7.5.0

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1  Scopep. 6

The present document specifies the functional architecture and information flows of the Voice Call Continuity feature which provides the capability to transfer the path of an existing voice call between a 3GPP CS system (GSM/UMTS) and IMS, and vice versa. These capabilities were designed per requirements in TS 22.101.

2  Referencesp. 6

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.
TS 22.228: "Service requirements for the Internet Protocol (IP) multimedia core network subsystem (IMS); Stage 1".
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
TS 23.018: "Basic Call Handling; Technical realization".
TS 23.078: "Customized Applications for Mobile network Enhanced Logic (CAMEL) Phase 4; Stage 2".
TS 33.102: "3G security; Security architecture".
TS 33.203: "Access security for IP-based services".
TS 22.952: "Priority service guide".
TS 22.004: "General on supplementary services".
TS 22.173: "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1".
TS 23.218: "IP Multimedia (IM) session handling; IM call model; Stage 2".
TS 23.002: "Network Architecture".
TS 23.011: "Technical realization of Supplementary Services".
TS 23.167: "IP Multimedia Subsystem (IMS) emergency sessions".
TS 24.010: "Mobile Radio Interface Layer 3 - Supplementary Services Specification - General Aspects".
TR 21.905: "Vocabulary for 3GPP Specifications".
ITU-T Recommendation E.164: "The international public telecommunication numbering plan".
TS 23.226: "Global Text Telephony".
RFC 3261  (June 2002): "SIP: Session Initiation Protocol".
OMA-ERELD-DM-V1_2-20060602-C: "Enabler Release Definition for OMA Device Management, Candidate Version 1.2".
TS 22.101: "Service aspects; Service principles".

3  Definitions, symbols and abbreviationsp. 7

3.1  Definitionsp. 7

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
Anchoring in IMS:
Insertion of the Domain Transfer Function in the signalling path of the voice call/session establishment in order to enable the capability of domain transfer for this call/session.
IP Multimedia Routing Number (IMRN):
An IMRN is a routable number that points to the IM CN subsystem. In a roaming scenario, the IMRN has the same structure as an international ISDN number. The Tel URI format of the IMRN is treated as a PSI within the IM CN subsystem.
CS Domain Routing Number (CSRN):
A CSRN is a number that is used to route a call from the IM CN subsystem to the user in the CS domain.
Domain Transfer:
Transfer of the access leg of a voice call on a UE from CS domain to IMS and vice versa while maintaining active session.
Access Leg:
This is the call control leg between the VCC UE and the DTF.
Remote Leg:
This is the call control leg between the DTF and the remote party from the VCC subscriber's perspective.
User Equipment supporting the VCC feature. The VCC UE is defined in clause 5.3.2 of this document.
VCC Domain Transfer Number (VDN):
A public telecommunication number, as defined by ITU-T Recommendation E.164 [16] used by the UE to request the DTF to perform Domain Transfer to the CS domain from the IMS.
VCC Domain Transfer URI (VDI):
A SIP URI used by the UE to request the DTF to perform Domain Transfer to the IMS from the CS domain.

3.2  Abbreviationsp. 7

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.
Third party call control
CS Adaptation Function
CS Domain Routing Number
Domain Selection Function
Domain Transfer Function
Initial Filter Criteria
IP Multimedia Routing Number
Public Service Identity
Voice Call Continuity
VCC Domain Transfer URI
VCC Domain Transfer Number

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