Question: In a Mobile Application Part (MAP) scenario, what is the primary purpose of the 'Forwarding reason' parameter when initiating call forwarding in a telecom network?
Option 1: To specify the reason for call forwarding, enabling the GMSC to handle the call appropriately based on the subscriber's status (e.g., busy, not reachable, no reply).
Option 2: To request the HLR to update the subscriber's location due to a change in their reachability status.
Option 3: To inform the VMSC about the need for additional resources to handle an incoming call.
Option 4: To trigger a notification to the subscriber about an unsuccessful call attempt.
Explanation: The 'Forwarding reason' parameter indicates why a call is being forwarded, enabling the Gateway Mobile Switching Center (GMSC) to manage the call flow based on the subscriber's status, ensuring calls are handled in accordance with network logic and subscriber preferences or circumstances.