Patent ID: 8761721

Claim:
A method, comprising: receiving, by a computing device, an emergency call via a session initiation protocol (SIP) invite that includes a cell identification (ID) and a service or device type associated with a user equipment (UE); determining, by the computing device and based on the service or device type, whether the UE is a fixed device or a wireless device; using, by the computing device, a cell database stored in the computing device to route the emergency call to a public safety answering point (PSAP) in response to determining that the UE is a fixed device or a wireless device, wherein using the cell database comprises: comparing, by the computing device, the cell ID provided in the SIP invite with the cell database to determine the PSAP; and wherein in response to determining that the UE is a fixed device: routing the emergency call to the PSAP based on a registered civic address of the UE.