4 me and ims network support both the me shall check

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4. ME and IMS network support both. The ME shall check the smartcard application in use. If a USIM/ISIM application is in use, then the ME shall start with the fully compliant IMS security registration procedure. The network, with receiving the initial REGISTER request, receives indication that the IMS UE is fully compliant and shall continue as specified by the main body of this specification. If a SIM is in use, then the ME shall start with the GIBA security registration procedure. If the ME starts with the fully compliant IMS security registration procedure when a SIM is in use, this is an error case to be handled as follows: when the S-CSCF requests authentication vectors from the HSS, the HSS will discover that a SIM is in use and returns an error. The S-CSCF shall answer with a 403 (Forbidden). After receiving the 403 response, the UE shall stop the attempt to register with this network. 5. ME supports GIBA security only, IMS network supports fully compliant IMS security only. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 110 Release 12
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The UE sends a REGISTER request to the IMS network that does not contain the security headers required by fully compliant IMS security. The fully compliant IMS security P-CSCF will detect that the Security-Client header is missing and return a 4xx response, as described in clause 5.2.2 of TS 24.229 [8]. This applies regardless of whether SIM or USIM/ISIM is in use. 6. ME supports fully compliant IMS security only, IMS network supports GIBA security only. A ME supporting Full IMS security only is not aware of GIBA security, so its behaviour is expected to be compliant with the procedures defined in the main body of this specification. Based on this, if a SIM is in use, the ME should not attempt to register using the full IMS security solution. Whatever attempt would fail anyway, as Full IMS security requires ISIM/USIM. If a USIM/ISIM application is in use, then the ME shall start with the fully compliant IMS security registration procedure. 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. After receiving the error response, the UE shall stop the attempt to register with this network, since the fully compliant IMS security is not supported. 7. ME supports fully compliant IMS access security only, IMS network supports both. A ME supporting Full IMS security only is not aware of GIBA security, so its behaviour is expected to be compliant with the procedures in the main body of this specification. Based on this, if a SIM is in use, the ME should not attempt to register using the full IMS security solution. Whatever attempt would fail anyway, as Full IMS security requires ISIM/USIM.
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