Question: When an external LCS (Location Service) client submits a location request using a TEL-URL to identify the target User Equipment (UE), how must the requesting Gateway Mobile Location Centre (GMLC) proceed in the context of Packet Switched (PS) domain?
Option 1: Convert the TEL-URL into an MSISDN (Mobile Subscriber Integrated Services Digital Network Number) and use this MSISDN as the target UE's address for the location request, following the Mobile Terminating Location Request (MT-LR) procedure.
Option 2: Directly forward the TEL-URL to the UE's serving network for resolution without conversion, initiating a bespoke location retrieval process specific to TEL-URLs.
Option 3: Reject the location request due to the use of a TEL-URL, requiring the external LCS client to resubmit with an MSISDN or IMSI (International Mobile Subscriber Identity) instead.
Option 4: Store the TEL-URL for batch processing later and respond to the external LCS client with a temporary acknowledgement, deferring the actual location retrieval.
Explanation: This is the correct procedure as per the given context. Converting the TEL-URL into an MSISDN allows the GMLC to utilize established MT-LR procedures for the PS domain, ensuring compatibility and streamlined processing of the location request. This approach facilitates efficient location services while adhering to standardized communication protocols between network elements.