Question: In an IMS (IP Multimedia Subsystem) environment, when the IMS-ALG (IMS Application Level Gateway) requests the IMS-AGW (IMS Access Gateway) to reserve transport addresses/resources, what can the IMS-ALG indicate regarding the DiffServ Code Point (DSCP) for outgoing media packets?
Option 1: Always set a default DSCP value of '0' for all outgoing media packets.
Option 2: Only copy the DSCP from incoming signaling packets to outgoing media packets.
Option 3: Either explicitly set or copy the DSCP from the corresponding received packet for outgoing media packets.
Option 4: Never modify the DSCP of outgoing media packets under any circumstance.
Explanation: This option correctly reflects the capability as described, allowing flexibility in handling QoS (Quality of Service) for media packets. The IMS-ALG can choose to either have a specific DSCP value set for outgoing media packets or to mirror the DSCP from the incoming packet, ensuring that QoS requirements are met based on the packet's origin or the network's current conditions. This approach supports dynamic and adaptive QoS management in IMS environments.