Patent ID: 7228414

Claim:
A method of seamlessly transferring an ongoing communication session between a first device and a correspondent device on an IP network from the first device to a second device, the method comprising: initiating a communication session between the correspondent device and the first device having a first device IP address, and being configured to allow a user to receive or send the communication session therefrom, whereby the correspondent device is configured to communicate with the first device during the communication session; negotiating to transfer the communication session from the first device to a second device, the second, device being configured to allow a user to receive or send the communication session therefrom; and transferring the first device IP address away from the first device to the second device so that data transferred from the correspondent device to the first device via the address thereof will be received by the second device, wherein the transferring of the first device IP address comprises: transferring the first device IP address from the first device to a Session Agent so that data transferred from the correspondent device to the first device via the address thereof will be received by the Session Agent and routed to the second device.