1Miikka Po KhartabiI,Ak kselka,Georg Mayer,Hisham Niemi. The IMS:IP Multimedia Concepts and Services in the Mobile Domain[M] United States:Wiley,John & Sons,2004.
2Voice over IMS profile(One Voice) [S].
33GPP TS 24.229(Release 8),IP multimedia call control protocol based on Session Initiation Protocol(SIP) and Session Description Protocol(SD P)(Stage3)[S].