Question: In a mobile terminating CS fallback call scenario, if a VLR decides to abort the call after sending an SGsAP-PAGING-REQUEST to the MME, but before receiving an SCCP connection with the Initial L3 message from the UE, what action does the VLR take regarding the MME?
Option 1: Send an SGsAP-SERVICE-ABORT-REQUEST message to the MME without altering the SGs association state.
Option 2: Establish a new SCCP connection directly with the UE to terminate the call.
Option 3: Update the UE's location in the HLR before taking any action towards the MME.
Option 4: Wait for an explicit response from the UE before sending any further messages to the MME.
Explanation: In this scenario, the VLR takes a proactive step to notify the MME about the abortion of the CS fallback call. Sending an SGsAP-SERVICE-ABORT-REQUEST message is the appropriate action as it informs the MME about the decision to abort without waiting for further responses from the UE, thus efficiently managing network resources and call states. The SGs association state remains unchanged to maintain continuity for potential future communications.