1ITU T Recommendation Q.1912.5. Interworking between Session Initiation Protocol (SIP) and Bearer Independent Call Control protocol or 1SDN User Part[S].
23GPP TS 29.162. Interworking between the IM CN subsystem and IP network[S].
3ETSI TS 183 021. Endorsement of 3GPP TS 29.162 Interworking between IM CN Sub-system and IP networks[S].
43GPP TS 29.163. Interworking between the IP Multimedia (IM) Core Network (ON)Subsystem and Circuit Switched (CS) networks[S].