Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); TISPAN; IP Multimedia Subsystem (IMS); Stage 2 description (V7.1.0; 3GPP TS 23.406 version 7.0.0 Release 7)
"The present document provides the ETSI endorsement of the 3GPP TS 23.228 ""IP Multimedia Subsystem; Stage 2@ version 7.2.0"". The present document provides the necessary adaptions to the 3GPP IP Multimedia Core Network Subsystem (IMS)@ in order to support the Access Networks and terminals in the scope of the present NGN Release."