O312 network authentication failure if the ue is not

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O.3.1.2 Network authentication failure If the UE is not able to successfully authenticate the network due to failed validation of the P-CSCF certificate, the UE shall send an alert message to the P-CSCF, which includes the failure information as specified in TLS. O.3.1.3 Synchronisation failure When the UE receives the challenge with the stale parameter in the www-Authenticate header set to TRUE, the UE shall retry the REGISTER request with a new encrypted response. The existing TLS session shall be used for the retry. O.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 new registration procedure if it still requires any IM services. O.3.2 Error cases related to the Security-Set-Up The requirements in clauses 7.3.2.1 and 7.3.2.2 apply. O.4 Management of TLS sessions O.4.1 Management of TLS sessions at the UE The UE shall be involved in only one registration procedure at a time, i.e., the UE shall remove any data relating to any previous incomplete registrations, including any TLS connection and session successfully created in a previous incomplete registration procedure. The UE may initiate a TLS session renegotiation at any time. When the UE receives a HELLO request from the P- CSCF it should initiate a renegotiation. The UE shall send all TLS session renegotiation messages inside the existing TLS connection. When the TLS connection is lost the UE shall initiate a registration procedure according to Annex N. O.4.2 Management of TLS sessions at the P-CSCF The lifetime of the TLS session negotiated between the UE and the P-CSCF is subject to local policies. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 87 Release 12
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The P-CSCF may trigger a TLS session renegotiation at any time by sending a HELLO request message to the UE. The P-CSCF shall send this message and all TLS session renegotiation messages inside the existing TLS connection. According to its local policy, the PCSCF may abort the communication if the UE does not initiate a TLS session renegotiation. When the TLS session renegotiation is successfully completed, the P-CSCF shall replace the old Session ID with the new TLS Session ID associated with the UE's IP address and port of the TLS connection, the IMPI and all the successfully registered IMPUs related to that IMPI, cf. clause O.2.2. The P-CSCF shall accept TLS handshake messages outside TLS connections associated with an existing registration only during a registration procedure according to Annex N. O.4.3 Authenticated re-registration If the UE has an already active TLS session, then it shall use this to protect the REGISTER message for re-registration. When the P-CSCF receives a REGISTER message protected by a TLS session whose TLS Session ID is associated with an IMPI from a previously successful registration (cf. O.2.2), then the P-CSCF shall proceed as follows: - If the IMPI is present in the REGISTER message the P-CSCF shall verify that the IMPI in the REGISTER matches the IMPI associated with the TLS Session ID. If the IMPIs match, then the P-CSCF shall forward this
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