Patent ID: 8897265

Claim:
A method comprising: hosting a communication session in a call server between a first communication device and a second communication device, the call server operable in an Internet Protocol (IP) based packet data network in which: (i) the call server functions as a bridge between the first communication device and the second communication device joining an original communication link between the first communication device and the call server with a second communication link between the second communication device and the call server to create a communication session between the first and second communication devices, and (ii) the first communication device includes at least two RF transceivers each capable of communicating with the call server over a separate network, wherein the original communication link between the first communication device and the call server is initially established over an original network and the IP based packet data network using a first telephone number associated with the first communication device; receiving an out of band signal from the first communication device, the out of band signal separate from the communication session and sent over an open data channel between the first communication device and the call server, the out of band signal comprising an instruction to handoff the original communication link to an alternate communication link between the first communication device and the call server; establishing the alternate communication link between the first communication device and the call server on an alternate network and the IP based packet data network using a second telephone number associated with the first communication device; and joining the alternate communication link between the first communication device and the call server on the alternate network with the second communication link between the second communication device and the call server to maintain the communication session between the first and second communication devices.