Patent ID: 8280342

Claim:
A method of operating a visited access gateway to provide an emergency communication service to a visiting mobile unit, the method comprising: transferring a user registration from the visiting mobile unit to a home communication network; receiving the user registration in the home communication network and transferring a home internet protocol address from the home communication network to the visiting mobile unit; in the visited access gateway: receiving an emergency call request having the home internet protocol address from the visiting mobile unit; transferring the emergency call request having the home internet protocol address over a signaling tunnel from the visiting mobile unit to a visited call processing system; receiving routing instructions from the visited call processing system, wherein the routing instructions include an internet protocol address for a visited emergency service node and an identity of a bearer tunnel between the visiting mobile unit and the visited emergency service node; and in accordance with the routing instructions, exchanging emergency communications having the home internet protocol address over the bearer tunnel between the visiting mobile unit and the visited emergency service node.