Question: In SIP session release signaling, when a P-CSCF is required to include network-provided location information, what does it send to initiate the process of obtaining this information?
Option 1: ST-Request with Required-Access-Info AVP
Option 2: SIP OPTIONS with Geolocation Header
Option 3: Diameter Location Request to HSS
Option 4: HTTP GET to PCRF for Location Data
Explanation: When a P-CSCF needs network-provided location information in SIP session release signaling due to operator policy, it sends an ST-Request (a Diameter message) with the Required-Access-Info AVP to initiate the process of obtaining this information from the PCRF, ensuring accurate location provision in SIP signaling.