Enabling location determination of user device originating emergency service call

A system for processing calls for emergency services from a user device having an associated line number, the system comprising:

• a network switch configured to:
• receive emergency service calls from a user device to a public safety answering point (PSAP) originating in a fixed access network and a mobile access network:
• determine whether each of the emergency service calls has originated from a home location in the fixed access network based in part on an asserted network type included in signaling of each of the emergency service calls;
• provide identification data that includes an Automatic Number Identification (ANI) in call signaling for a given emergency service call of the emergency service calls in response to determining that the given emergency service call originated from the user device at the home location in the fixed access network;
• provide identification data that includes a pseudo-ANI in the call signaling for another emergency service call of the emergency service calls in response to determining that the other emergency service call originated from the user device at a remote location in the fixed access network;
• and
• provide identification data that includes a pseudo-ANI in the call signaling for yet another emergency service call of the emergency service calls in response to determining that the yet another emergency service call originated from the user device communicating on a mobile access network, wherein the mobile access network comprises a cellular telephone network;
• rout the emergency service calls to the PSAP;
• a first location server in the fixed access network configured to:
• determine a location of the user device in the fixed access network in response to a query from an Automatic Location Identification (ALI) server in the PSAP for the other emergency service call that originated from user device at the remote location in the fixed network;
• and
• provide the determined location to the ALI server;
• and
• a second location server in the mobile access network configured to:
• determine a location of the user device in the mobile access network in response to a query from the ALI server for the yet another emergency service call that originated from the user device communicating on the mobile access network;
• and
• provide the determined location to the ALI server,
• wherein the location corresponding to the user device is determined based on the ANI for the given emergency service call originating from the user device at the home location in the fixed access network.