2[2]3GPP TS 23.228 v6.9.0 (2005-03): IP Multi media Subsystem (IMS) stage 2 (Release 6)
3ETSI ES 282 007.Telecommunications and Internet converged services and protocols for advanced networks (TISPAN):IP multimedia subsystem(IMS);functional architecture,2006
4ETSI ES 282 006.Telecommunications and Internet converged services and protocols for advanced networking (TISPAN);IP multimedia subsystem(IMS);stage 2,2006
5ETSI TS 182 012.Telecommunications and Internet converged services and protocols for advanced networks (TISPAN);IMS-based PSTN/ISDN emulation subsystem (PES);functional architecture,2006
