Question: In an IP Multimedia Subsystem (IMS), when a User Equipment (UE) initiates a Resource Reservation request for an IP-CAN session, what is the expected content of this request to facilitate correct matching with the corresponding authorization?
Option 1: Only the requested QoS parameters (e.g., bandwidth, latency)
Option 2: The UE's IP address and port number
Option 3: Traffic mapping information for the media flows involved
Option 4: Details of the SIP session ID alone
Explanation: To ensure proper authorization and resource allocation, when a UE initiates a Resource Reservation request, including traffic mapping information is crucial. This detail enables the IP-CAN to correctly match the reservation request with the corresponding authorization, especially in scenarios where multiple media flows are combined onto a single IP-CAN bearer. This process is vital for efficient policy and charging control within the IMS framework.