If a ue supports sip digest as well as further

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If a UE supports SIP Digest as well as further authentication methods, the UE shall proceed as follows: - If the access network is of a type defined in 3GPP specifications then the UE shall not select SIP Digest, in accordance with the requirement at the start of this clause. NOTE 2: The rules listed in Annex T of this specification say how a UE can select between IMS AKA and GIBA. - If the access network is of a type not defined in 3GPP specifications then - if both the UE and network support IMS AKA according to the main body or Annex M of this specification, as determined by the use of sip-sec-agree RFC 3329 [21], the authentication method shall be IMS AKA; - otherwise the authentication method shall be SIP Digest as specified in Annex N of this specification. N.2 Authentication N.2.1 Authentication Requirements N.2.1.1 Authentication Requirements for Registrations For the purposes of this subclause, the name "authentication" is used synonymously with "entity authentication". Before a user can get access to the IM services at least one IMPU needs to be registered and the IMPI authenticated in the IMS at application level. In order to get registered the UE sends a SIP REGISTER message towards the SIP registrar, i.e. the S-CSCF, cf. figure N.1, which will perform the authentication of the user. The message flows are the same regardless of whether the user has an IMPU already registered or not. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 75 Release 12
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Figure N.1: The IMS Authentication using SIP Digest for an unregistered IM subscriber and successful mutual authentication The detailed registration procedures are defined in TS 24.229 [8]. The NAT traversal procedures in RFC 5626 [32] and in TS 24.229 [8] clause K.4 shall apply. NOTE 1: It is recognized that RFC 5626 [32] can be useful for capabilities beyond NAT traversal (e.g. multiple registrations) however this annex does not consider such capabilities at this time. The UE should include an indication of support for managing client-initiated connections as defined in RFC 5626 [32] in all REGISTER requests. Per RFC 5626 [32], the P-CSCF shall be able to accept registration request with or without an indication of support for managing client-initiated connections. However, the P-CSCF should only accept a register request without support for managing client-initiated connections if it can determine that no NAT is present in the signaling path between the UE and the P-CSCF. NOTE 2: It is left to stage 3 specifications how a P-CSCF can determine whether the conditions in the preceding paragraph are met. An operator may configure all UEs and P-CSCFs in his network not to use support for managing client-initiated connections (provided there is no roaming). Cf. also the implications of the indication of support for managing client-initiated connections for the P-CSCF procedures after receiving SM11.
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