name: NBA
full_form: NASS bundled authentication
context: 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 âPANI-awareâ. 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
description: NASS bundled authentication (NBA) is a protocol used for authenticating subscribers in the IMS network. It is one of the mechanisms used by the S-CSCF to perform authentication steps, as described in 3GPP TS 33.203.
explanation: The text explicitly states that NBA is a 'protocol' used for subscriber authentication within the IMS network. This aligns with the definition of a protocol as a set of rules governing communication between entities.
section_title: P.4.2	Mechanisms for performing steps 1 to 3 in P.4.1
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biotag_Description: B-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,O,O,O,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,B-Organization,B-Specification,O