Question: In IMS session establishment/modification, how does a UE (User Equipment) typically derive Authorized UMTS QoS parameters when Service Based Local Policy (SBLP) is applied?
Option 1: Directly from SIP headers without involving SDP information
Option 2: From P-CSCF via the Gq interface, bypassing local mapping
Option 3: By applying its own mapping rules to SDP parameters received in the SIP/SDP message, after receiving an authorization token
Option 4: Solely based on application demands without considering SDP parameters
Explanation: When SBLP is applied and the UE receives an authorization token, it uses the SDP information from the SIP/SDP message to derive the Authorized UMTS QoS parameters. This process involves local mapping within the UE, utilizing both the received SDP parameters and potentially its application demands, highlighting the integration of network policy (via SBLP) with device-initiated QoS requests.