TISPAN; Voice Call Continuity (VCC); Stage 2 [3GPP TS 23.206 Release 7, modified]
The present document provides the ETSI TISPAN endorsement of 3GPP TS.23.206 [3] " Voice Call Continuity (VCC) between Circuit Switched (CS) and IP Multimedia Subsystem (IMS); Stage 2: Release 7”.
The current VCC solution explained in the TS.23.206 is essentially defined for a core IMS provider that is a mobile operator (that has also CS domain). In Informative Annex ZA theres is a possible scenario how the solution can be extended to a generic IMS operator (e.g. when fixed network operator and CS mobile network operator are separate organisations).