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ETSI TS 133 203
M00003666
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ETSI TS 133 203 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; 3G security; Access security for IP-based services (3GPP TS 33.203 version 12.8.0 Release 12)
standard by European Telecommunications Standards Institute, 01/01/2015
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The scope for ETSI TS 133 203 is to specify the security features and mechanisms for secure access to the IMsubsystem (IMS) for the 3G mobile telecommunication system.Since the scope also encompasses the use of these security features and mechanisms for secure access to IMS in thecontext of fixed broadband networks and 3GPP2 networks, Annex L and Annex S specify how the material in the mainbody and other normative Annexes of this document apply to the fixed broadband networks and 3GPP2 networksrespectively.
The IMS supports IP Multimedia applications such as video, audio and multimedia conferences. SIP, Session InitiationProtocol, was chosen as the signalling protocol for creating and terminating Multimedia sessions, cf. RFC 3261 [6].This specification only deals with how the SIP signalling is protected between the subscriber and the IMS, how thesubscriber is authenticated and how the subscriber authenticates the IMS.