name: IMPI
full_form: IP Multimedia Private User Identity
context: ("qop") parameter shall be "auth-int"; and c) the "username" parameter shall contain user's private identity (IMPI). NOTE: If the UE does not have an ISIM application with an IMPI, the IMPI will be constructed from IMSI, according to 3GPP TS 23.003 [7]. In addition to RFC 3310 [6], the following apply: a) In the initial request from the UE to the BSF, the UE shall include Authorization header with following parameters: - the username directive, set to 1) the value of the TMPI if one has been associated with the private user identity as described in 3GPP 33.220 [1]; or 2) the value of the private user identity; - the realm directive, set to the BSF address derived from the IMPI or IMSI according to 3GPP TS 23.003 [7]; - the uri directive, set to either absoluteURL "http://<BSF address>/" or abs_path "/", and which one is used is specified in RFC 2617 [9]; - the nonce directive, set to an empty value; and - the response directive, set to an empty value; b) In the challenge response from
description: The IP Multimedia Private User Identity (IMPI) is a unique identifier for a user in the IMS network. It is used for authentication and authorization purposes.
explanation: IMPI is classified as a Parameter because it is a critical attribute used in the authentication process, specifically mentioned in the context as part of the Authorization header parameters.
section_title: 15.29.2Conformance requirement
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