Question: In a SIP signaling scenario for MCVideo, how is the priority value from the Resource-Priority header field mapped to the Reservation-Priority AVP in the AAR command by the P-CSCF?
Option 1: The highest priority is mapped to DEFAULT (0), and the lowest priority is mapped to PRIORITY-FIFTEEN (15).
Option 2: All priorities are uniformly mapped to a single value, PRIORITY-ONE (1), for simplicity.
Option 3: Priorities are mapped in reverse order, but with an offset, starting from PRIORITY-TWO (2) for the lowest.
Option 4: The lowest priority is mapped to DEFAULT (0), and priorities incrementally map up to the highest as PRIORITY-FIFTEEN (15).
Explanation: This correct mapping ensures that the priority hierarchy is maintained from SIP signaling through to the AAR command, with the least urgent requests being marked as DEFAULT (0) and the most urgent reaching up to PRIORITY-FIFTEEN (15). This incremental mapping supports a nuanced handling of priorities in MCVideo sessions, aligning with the need for differentiated quality of service (QoS) treatments based on the signaled priority.