3 a user always uses either nba or sip digest but not

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3) A user always uses either NBA or SIP Digest, but not sometimes NBA and sometimes SIP Digest. If the S-CSCF supports both SIP Digest and NBA, the S-CSCF shall send an authentication request to the HSS indicating that the authentication scheme is unknown. The S-CSCF shall infer the authentication scheme used by the subscriber from authentication request response by the HSS. If the returned authentication scheme is NBA the S-CSCF shall proceed with this authentication only if the P-CSCF is in the home network and “PANI-aware”. If the returned authentication scheme is SIP Digest the S-CSCF will learn from the "integrity-protected" flag in the subsequently received REGISTER request containing the challenge response whether SIP Digest with or without TLS is used. If the S-CSCF supports NBA but not SIP Digest, the S-CSCF shall send an authentication request to the HSS indicating that the authentication scheme is either NBA or unknown. The S-CSCF shall infer the authentication scheme used by the subscriber from authentication request response by the HSS. If the returned authentication scheme is NBA the S- CSCF shall proceed with this authentication only if the P CSCF is in the home network and “PANI-aware”. If the S-CSCF supports SIP Digest but not NBA, the S-CSCF shall send an authentication request to the HSS indicating that the authentication scheme is either SIP digest or unknown. The S-CSCF shall infer the authentication scheme used by the subscriber from authentication request response by the HSS. If the returned authentication scheme is SIP Digest the S-CSCF will learn from the "integrity-protected" flag in the subsequently received REGISTER request containing the challenge response whether SIP Digest with or without TLS is used. P.5 Co-existence of PANI-aware and other P-CSCFs This section introduces a configuration-based solution, which enables an S-CSCF to serve both PANI-aware P-CSCFs and P-CSCFs that are not PANI-aware. Configuration-based solution: 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 93 Release 12
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The S-CSCF shall be configured in such a way that it knows which P-CSCFs are PANI-aware, according to section P.3. The S-CSCF knows the P-CSCF which forwarded the registration request from the Via header. NOTE: Both GIBA and NBA require the P-CSCF to be in the home network. This may help in realising the configuration-based solution. P.6 Considerations on the Cx interface The specification of certain Cx commands in TS 29.228 [39] requires the inclusion of a private user identity (IMPI). When a registration request is sent without an Authorization header then such a private user identity is not available. For GIBA, an Authorization header is never included in a registration request. However, it is specified for GIBA in TS 23.003 [46] how to create the private and temporary public user identity, and in TS 24.229 [8] (c.f., clause 5.3.1.2) how to derive a private user identity from a public user identity. This derived private user identity is then used in Cx commands.
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