Patent ID: 7986665

Claim:
A method in a mobile communication device for use in routing a voice call between the mobile device operating in a wireless local area network (WLAN) and a communication device connected in a local area network (LAN) which includes the WLAN, with use of a conferencing gateway which combines media streams of connection legs of the voice call, the method comprising the acts of: causing the voice call to be established, via a WLAN interface of the mobile device, with the communication device connected in the LAN using a session initiation protocol (SIP), so that the voice call is maintained within the LAN without being routed via a conferencing gateway; in response to identifying, at the mobile device, a handover indication for the voice call: sending, during the voice call via a WWAN interface of the mobile device, a request message to the conferencing gateway, for establishing a first connection leg through the WWAN between the mobile device and a conference room of the conferencing gateway via the WWAN interface; and sending, during the voice call via a WLAN interface of the mobile device, a SIP REFER message to the communication device, so as to establish a second connection leg between the communication device and the conference room of the conferencing gateway.