TS 123 206 : 7.5.0

Intellectual Property Rights
Foreword
Foreword
1 Scope
2 References
3 Definitions, symbols and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 VCC Concepts
  4.1 General
  4.2 Radio environments
  4.3 Domain selection
  4.4 Anchoring in IMS of VCC subscriber calls
  4.5 Domain transfer procedures
  4.6 Regulatory aspects
5 Architecture
  5.1 General
  5.2 Reference model
  5.3 VCC entities
  5.4 Reference points
6 Information flows and procedures
  6.1 Registration
  6.2 Origination
  6.3 Termination
  6.4 Domain transfer
  6.5 Supplementary services
  6.6 CAMEL services
  6.7 Presence services
  6.8 Other procedures
7 Security
  7.1 General
  7.2 Access security for CS Domain
  7.3 Access security for IMS
8 Charging
  8.1 General description
  8.2 Charging strategy
  8.3 Accounting strategy
Annex A (informative): Call diversion techniques from
        CS to IMS
    A.1 Implementation options for call diversion from
        CS to the DTF in IMS
Annex B (informative): Domain selection for VCC
Annex C (informative): Techniques for the prevention
        of circular looping for CS Terminations
    C.1 Implementation options prevention of circular
        looping for CS Terminations
Annex D (informative): Change history
History

Describes 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.