If you are calling 911 from a land line, the service address of the phone you are calling on is used to locate the origin of your call. This is handled by the phone service provider, not LINK-GIS. In the case of a cell phone, the location of your 911 call is determined using GPS, if your phone has this capability, or by triangulating your location using all the cell towers that can pick up the signal from your phone. The origin of your 911 phone call is handled by the phone carrier or dispatch center, and LINK-GIS does not have this capability, nor does it have any involvement in active calls to 911 dispatch centers. LINK-GIS does provide addressing data to several dispatch centers that handle 911 calls, which they use internally to assist with managing their addressing data.