ETSI ES 283 027-2006 电信和互联网融合业务及高级网络协议(TISPAN).在IP多媒体(IM)核心网(CN)子系统和电路交换(CS)网络之间的SIP-ISUP交互作用核准本(版本1.1.1).3GPP TS 29.1
Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Endorsement of the SIP-ISUP Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks