Patent ID: 8050395

Claim:
A system comprising: an analog telephone adapter (ATA) which comprises a dial tone generator, control logic, a memory, and a packet generator, the dial tone generator to generate a dial tone when the ATA is in an unregistered state, the control logic to process a dial-out request to a target phone number made by an external device when the ATA is in the unregistered state, the control logic to direct the packet generator to generate an invite packet for an emergency proxy to handle the dial-out request on behalf of the ATA when the ATA is in the unregistered state, wherein the invite packet encodes location data and cause data, wherein the cause data indicates one of a plurality of emergency situations, wherein the memory stores a list of phone numbers that are permitted to be called when the ATA is in the unregistered state, and wherein the control logic directs the packet generator to generate the invite packet upon determining that the target phone number is included in the list of phone numbers.