GeoLynx Spatial Router determines the correct 9-1-1 PSAP a call should be routed to based on the location of the calling device. Caller locations can be geodetic coordinates such as lat/long point, polygon, circle, ellipse, arcband, or a civic address. The service information returned includes the service uniform Resource Identifier (URI) information for the service requested, which indicates which PSAP to route the call. i3 PSAPs can query the GeoLynx Spatial Router directly using LoST to obtain emergency service zone information to determine selective call transfer options for live 9-1-1 calls. Other 9-1-1 elements such as other ESRPs and ECRFs, LIS, and even calling devices can query GeoLynx Spatial Router with routing or validation queries, or to discover services.