Question: When a terminating P-CSCF requests network-provided location information upon receiving a SIP INVITE with an SDP offer, which of the following AVPs must be included in the AA-Request besides 'ACCESS_NETWORK_INFO_REPORT' within the Specific-Action AVP?
Option 1: Only Required-Access-Info AVP
Option 2: Only Service-Info-Status AVP with PRELIMINARY SERVICE INFORMATION value
Option 3: Both Required-Access-Info AVP and Service-Info-Status AVP with PRELIMINARY SERVICE INFORMATION value, plus service information derived from the SDP offer
Option 4: Neither Required-Access-Info nor Service-Info-Status AVPs are required
Explanation: When a SIP INVITE includes an SDP offer and the P-CSCF needs to request network-provided location information, the AA-Request must be comprehensive. This includes specifying the action, detailing what access info is needed (Required-Access-Info AVP), providing preliminary service details from the SDP, and indicating the status of this service info (Service-Info-Status AVP set to PRELIMINARY SERVICE INFORMATION).