Question: In a 3GPP-compliant network, when SMS over IP (using IMS SIP signalling) is utilized for separate delivery of SMS, which of the following events is NOT required to be reported by the Intercepting Control Element (ICE) to the Delivery Function (DF)?
Option 1: Intercepted SIP event
Option 2: Successful SMS message delivery acknowledgement from the User Equipment (UE)
Option 3: HSS related event - Serving System for use when roaming
Option 4: Location information request from the HSS
Explanation: The correct answer is Option 2 because the focus of required reported events is on intercept-related signalling and subscriber management (like intercepted SIP events and several HSS related events), rather than confirmation of message delivery at the device level, such as successful SMS message delivery acknowledgement from the User Equipment (UE).