If a usimisim application is in use then the me shall

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If a USIM/ISIM application is in use, then the ME shall start with the fully compliant IMS 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. 8. ME supports both, IMS network supports fully compliant IMS access security only. 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 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 (in this case the IMS authentication procedure will fail). In this context, if the ME starts with the fully compliant IMS security registration procedure, this is an error case: when the S-CSCF requests authentication vectors from the HSS, the HSS will discover that the SIM is in use and return 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. 9. Both ME and IMS network support fully compliant IMS access 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 specified in the main body of this specification. Based on this, if a SIM is in use, the UE should not attempt to register using the full IMS security solution. If the UE 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: the HSS will discover that a SIM is in use and return an error to the S-CSCF. 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. If the USIM/ISIM application is in use, IMS registration shall take place as described by the main body of this specification. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 111 Release 12
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T.8 Message Flows T.8.1 Successful registration Figure T.1 below describes the message flow for successful registration to the IMS that is specified by the early IMS security solution. NOTE: The "received" parameter is only sent from P-CSCF to S-CSCF under the conditions given in RFC 3261 [6]. The procedure is as follows. The UE starts by setting up a PDP context. When a PDP context has been set up successfully, the UE sends a SIP REGISTER. The REGISTER message contains the IP address and the IMPU of the UE. The GGSN checks that the IP address provided in the REGISTER message matches the IP address allocated to the UE when the PDP context was set up. When the IP address has been verified, the GGSN forwards the REGISTER message to the P-CSCF.
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