3gpp 3gpp ts 33203 v12670 2014 0609 109 release 12 as

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3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 109 Release 12
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As a result, GIBA security UEs shall not add an explicit indication for the security used to the IMS signaling. An IMS network supporting both GIBA security and fully compliant IMS security UEs shall use GIBA security for authenticating the UE during registrations that do not contain the security headers specified by the main body of this specification (Authorization and Security-Client). Without sending an Authorization Header in the initial REGISTER request, GIBA UEs only provide the IMS public identity (IMPU), but not the IMS private identity (IMPI) to the network (this is only present in the Authorization header for fully compliant IMS security UEs). During the process of user registration for GIBA security, the Cx interface carries the privateuser identity in Cx-UAR requests (sent by I-CSCF) and Cx-MAR as well as Cx-SAR requests (sent by S-CSCF). The private user identity within these requests is derived in accordance to TS 24.229 [8] (clause 5.3.1.2 and 5.4.1.2.1E). If the S-CSCF receives an indication that the UE is an GIBA UE, then it shall be able to select the GIBA in the Cx- MAR request. For interworking between GIBA security and fully compliant IMS security implementations during IMS registration, an ME that implements the full IMS security solution as specified in the main body of this specification (or both GIBA and full IMS security) shall not attempt to register using the full IMS security solution if neither a USIM nor a ISIM is present. The following cases shall be supported: 1. Both ME and IMS network support GIBA security only. IMS registration shall take place as described by the present document. This applies regardless of whether SIM or USIM/ISIM is in use. 2. ME supports GIBA security only, IMS network supports both GIBA security and fully compliant IMS security. IMS registration shall take place as described by the present document. This applies regardless of whether SIM or USIM/ISIM is in use. 3. ME supports both, IMS network supports GIBA security only. The ME shall check the smartcard application in use. If a SIM is in use, then it shall start with a GIBA security procedure, else it shall start with the fully compliant IMS Registration procedure. In the second case, the GIBA P-CSCF shall answer with a 420 (Bad Extension) failure, since it does not recognize the method mandated by the Proxy-Require header that is sent by the UE in the initial REGISTER request. NOTE 2: The Proxy-Require header cannot be ignored by the P-CSCF. The UE shall, after receiving the error response, send a GIBA registration, i.e., shall send a new REGISTER request without the fully compliant IMS security headers. NOTE 3: If the UE already has knowledge about the IMS network capabilities (which could for example be preconfigured in the UE), the appropriate authentication method can be chosen. The UE can use fully compliant IMS security, if the network supports this, otherwise the UE can use GIBA security.
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