Patent ID: 7200400
Filing Date: 2007-04-03
Classification: H04W

Abstract:
1. A method of roaming between a mobile network and a wireless network comprising the steps of: receiving, over the wireless network, an invite from a user agent disposed within a mobile communications device, wherein the mobile communications device is engaged in a call over a voice channel in the mobile network; selecting one of a plurality of gateways having an affinity with the user agent, wherein each gateway is an interface between at least one mobile network and the wireless network, and wherein the step of selecting one of the plurality of gateways comprises determining a network location of the selected gateway; and handing off the call from the mobile network so that at least a portion of the call is conducted over the wireless network using the selected gateway, wherein the step of handing off the call comprises sending a reply to the user agent via the wireless network, the reply specifing the network location of the gateway selected.