Question: Upon receiving the first final SIP response, how does the P-CSCF update the service information for the SIP session, and what action is subsequently taken by the PCRF regarding installed PCC Rules?
Option 1: The P-CSCF updates service information to match the remaining early dialogue's requirements, sending an AA request without the SIP-Forking-Indication AVP, prompting the PCRF to update installed PCC Rules and Authorized-QoS to match the new service information.
Option 2: The P-CSCF combines all early dialogues' service information, sending an AA request with a SIP-Forking-Indication AVP set to MULTIPLE_DIALOGUES, leading the PCRF to append new PCC Rules without altering existing ones.
Option 3: The P-CSCF discards all service information from early dialogues, only sending an AA request upon receiving a subsequent SIP invite, which causes the PCRF to reinstall all PCC Rules based on default settings.
Option 4: The P-CSCF sends multiple AA requests for each early dialogue, with the PCRF aggregating these to update installed PCC Rules and Authorized-QoS information cumulatively.
Explanation: This is correct because, according to the provided context, upon receiving the first final SIP response, the P-CSCF updates the service information to match only the requirements of the remaining early dialogue (now progressed to an established dialogue) and sends an AA request without the SIP-Forking-Indication AVP. The PCRF then updates the installed PCC Rules and Authorized-QoS information to align with this new, singular service information set, also removing non-matching filters and adjusting gate statuses as necessary.