Patent ID: 8335187

Claim:
A mobile device-initiated call handover method for comprising: determining by a mobile device that the mobile device is in a service coverage area of a wireless local area data network, and based on a result of the determining, initiating from the mobile device an establishment of a packet data based leg for a call between the mobile device and a first component of a public mobile telephone network, wherein at least part of the packet data based leg is established over the wireless local area data network; while the call is in progress, sending by the mobile device a redirection request to initiate a handoff of the call to the public mobile telephone network based at least in part on an anticipated or actual movement of the mobile device out of the service coverage area of the wireless local area data network into a service coverage area of the public mobile telephone network; responsive to the redirection request, initiating from the first component of the telephone network a first circuit based leg for the call between the first component and the mobile device, wherein at least part of the first circuit based leg is established over the public mobile telephone network; and re-routing the call between the mobile device and the first component of the telephone network from the packet data based leg to the first circuit based leg.