name: SD-AV
full_form: SIP Digest Authentication Vector
context: we quote the crucial text from 3GPP TS 33.203 [3] Annex N.2 here: "Upon receiving the SIP REGISTER the S-CSCF shall use a SIP Digest Authentication Vector (SD-AV) for authenticating the user. If the S-CSCF has no valid SD-AV for the specific IMPI, then the S-CSCF shall send a request for SD-AV(s) to the HSS in CM1 where the number m of SD-AVs wanted is equal to 1. " and "Upon receipt of a request from the S-CSCF, the HSS sends one SD-AV to the S-CSCF using CM2. The SD-AV consists of the qop (quality of protection) value, the authentication algorithm, realm, and a hash, called H(A1), of the IMPI, realm, and password. Refer to RFC 2617 [12] for additional information on the values in the authentication vector for SIP Digest based authentication. The qop value shall be set to "auth" since SIP Digest, as used in IMS, can only provide authentication, not message integrity." and "The S-CSCF generates a random nonce, stores H(A1) and the nonce against the IMPI, and then sends a SIP 401
description: A set of values used for authenticating users in IMS (IP Multimedia Subsystem), specifically with SIP Digest. It includes parameters such as qop (quality of protection) value, authentication algorithm, realm, and a hash called H(A1) of the IMPI, realm, and password.
explanation: The description explicitly states that this parameter set is used for user authentication within the IMS framework, employing SIP Digest. This clearly classifies it as an authentication parameter.
section_title: 5.1.1 	Use of SIP Digest in Common IMS
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