name: UPSF
full_form: User Profile Server Function (a concept defined by ETSI TISPAN)
context: methods is required at this stage, because a TISPAN-specific Cx-MAR-request (e.g. using the value "unknown") will be handled by the UPSF (defined by TISPAN) and not the HSS (defined by 3GPP), and the UPSF will not be able to handle 3GPP authentication methods (i.e. Early IMS) and vice versa. - Step 3: In step 3, the S-CSCF follows the TISPAN specification ETSI TS 183 033 [9] for handling non-IMS-AKA registration requests.
description: The User Profile Server Function (UPSF) is a network component defined by ETSI TISPAN, responsible for managing user profiles and handling specific requests in a telecommunications network.
explanation: The UPSF is classified as a Network Function based on its role in handling Cx-MAR-requests and managing user profiles within the network, as highlighted by the context from 3GPP TS 33.803.
section_title: 6.2.1	Stepwise approach
biotag_Context: O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,B-Organization,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Organization,O,B-Organization,B-Specification,O,O,O,O,O,O,O,O
biotag_Description: O,O,O,O,O,O,O,O,O,O,O,O,B-Organization,O,O,O,O,O,O,O,O,O,O,O,O,O,O