name: IMPU
full_form: IM Public Identity
context: Digest in terms of the rules in Annex P of TS 33.203 [5]. If it is, the procedures apply below. Editor's Note: Routing of incoming and outgoing calls is FFS. One of the possible methods is that the Web identity as the temporary IMPU or WIC/eP-CSCF generating a special temporary IMPU sent to the IMS networks for initial registration, but this temporary IMPU is barred for the session, and the IMPU linking with the Web identity is implicitly registered. In this way the IMPU can be used for session. Editor's Note: Whether inter domain calls (I.e. between two IMS operators) are possible when web identities are used for addressing is FFS. 3) Authentication Vector Request After receiving the REGISTER request, the S-CSCF shall send the Authentication Vector Request (AV Req) towards HSS. The AV Req message includes the user's Web identity and the WWSF identity. 4) Authentication Vector Response Upon receiving the request from the S-CSCF, the HSS forwards the request towards the proxy. The
description: IM Public Identity (IMPU) is a parameter used in IMS networks for identifying users and routing sessions. It is utilized in various procedures such as registration, authentication, and session establishment.
explanation: The text explicitly states that IMPU is a parameter used within IMS networks for identification and session routing. This aligns with the definition of a parameter as a specific attribute or value used in a system.
section_title: 6.1.2.4	Use of direct authentication between WIC and eP-CSCF
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