Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; TISPAN; IP Multimedia Call Control Protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP) Stage 3 [3GPP TS 2
"The present document provides the ETSI TISPAN endorsement of 3GPP TS 24.229 [1]: ""3rd Generation Partnership Project; Technical Specification Group Core Network and Terminals; IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 (Release 7)"" in line with the requirements of TISPAN NGN. The present document together with the endorsed document provides the necessary SIP/SDP specifications for supporting TISPAN Release 2 requirements."