Question: What is the primary purpose of the 'IP-SM-GW Absent Subscriber Diagnostic SM' parameter in the context of SMS delivery over IMS?
Option 1: To indicate the reason for a failed SMS delivery due to an absent subscriber
Option 2: To set a timer for SMS delivery attempts in the IP-SM-GW
Option 3: To signal that an SMS was successfully delivered via the IMS network
Option 4: To request a change in the SMS delivery protocol from IMS to SS7
Explanation: The 'IP-SM-GW Absent Subscriber Diagnostic SM' parameter provides diagnostic information regarding the outcome of SMS deliveries, specifically indicating when an SMS cannot be delivered because the subscriber is absent, aiding in troubleshooting and network optimization.