Question: In a Location Services (LCS) scenario, if a location estimate cannot be obtained by the RAN for an emergency call setup, what action is taken by the VMSC/MSC server upon receiving this failure?
Option 1: The VMSC/MSC server sends a failure notification to the GMLC and terminates the call setup.
Option 2: The VMSC/MSC server initiates emergency call setup using the normal NI-LR (Network-Initiated Location Request) procedures.
Option 3: The VMSC/MSC server requests the RAN to use an alternative positioning method for location estimation.
Option 4: The VMSC/MSC server directly assigns a default NA-ESRK or NA-ESRD for emergency services routing.
Explanation: When the RAN cannot provide a location estimate, the VMSC/MSC server must still facilitate the emergency call. Since location information is crucial but not available, initiating the call setup using normal NI-LR procedures allows the network to proceed with the emergency call while potentially seeking alternative means of location determination or using last known locations, ensuring the call can be connected for emergency services.