In case ik im was derived correctly but the response

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In case IK IM was derived correctly, but the response was wrong the authentication of the user fails at the S-CSCF due to an incorrect response. The S-CSCF shall send a 4xx Auth_Failure message to the UE, via the P-CSCF, which may pass through an already established SA. Afterwards, both, the UE and the P-CSCF shall delete the new SAs. 7.3.1.2 Network authentication failure If the UE is not able to successfully authenticate the network, the UE shall send a REGISTER message which may pass through an already established SA, indicating a network authentication failure, to the P-CSCF. The P-CSCF deletes the new SAs after receiving this message. 7.3.1.3 Synchronisation failure In this situation, the UE observes that the AUTN sent by the network in SM6 contains an out-of-range sequence number. The UE shall send a REGISTER message to the P-CSCF, which may pass through an already established SA, indicating the synchronization failure. The P-CSCF deletes the new SAs after receiving this message. 7.3.1.4 Incomplete authentication If the UE responds to an authentication challenge from a S-CSCF, but does not receive a reply before the request times out, the UE shall start a registration procedure if it still requires any IM services. The first message in this registration should be protected with an SA created by a previous successful authentication if one exists. When the P-CSCF receives a challenge from the S-CSCF and creates the corresponding SAs during a registration procedure, it shall delete any information relating to any previous registration procedure (including the SAs created during the previous registration procedure). If the P-CSCF deletes a registration SA due to its lifetime being exceeded, the P-CSCF should delete any information relating to the registration procedure that created the SA. 7.3.2 Error cases related to the Security-Set-up 7.3.2.1 Proposal unacceptable to P-CSCF In this case the P-CSCF cannot accept the proposal set sent by the UE in the Security-Set-up command of SM1. The P-CSCF shall respond to SM1 indicating a failure, by sending an error response to the UE. 7.3.2.2 Proposal unacceptable to UE If the P-CSCF sends in the security-setup line of SM6 a proposal that is not acceptable for the UE, the UE shall abandon the registration procedure. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 40 Release 12
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7.3.2.3 Failed consistency check of Security-Set-up lines at the P-CSCF The P-CSCF shall check whether authentication and encryption algorithms list received in SM7 is identical with the authentication and encryption algorithms list sent in SM6. If this is not the case the registration procedure is aborted. (Cf. clause 7.2). 7.4 Authenticated re-registration 7.4.0 General Every registration that includes a user authentication attempt produces new security associations. If the authentication is successful, then these new security associations shall replace the previous ones. This clause describes how the UE and P-CSCF handle this replacement and which SAs to apply to which message.
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