Patent ID: 7142857
Filing Date: 2006-11-28
Classification: H04W,Y10S

Abstract:
1. A method for maintaining call control at a gateway mobile switching: center for a roaming mobile unit utilizing a packet network for bearer traffic transport, the method comprising: (a) receiving an incoming call leg at the gateway mobile switching center for the roaming mobile unit; (b) determining a data link connection identifier for a protocol handler for voice at the gateway mobile switching center; (c) providing the data link connection identifier to a serving mobile switching center and to a base station, and obtaining from the serving mobile switching center a packet address of the base station for communication with the roaming mobile unit to create a packet link between the gateway mobile switching center and the base station; (d) providing an alert to the roaming mobile unit; and (e) when an answer has been received from the roaming mobile unit, providing a connection between the roaming mobile unit and the incoming call leg utilizing the packet link between the gateway mobile switching center and the base station.