US Patent 7397775 Method and apparatus for routing calls

A communication unit (CU) (109, 111) network controller (113) and corresponding methods (603-609) are described that facilitate selectively routing calls. The CU includes a transceiver (403) suitable to support an air interface with a local area network (LAN) (101) and with a wide area network (WAN) (105) and a controller (405) that is coupled to and controlling the transceiver. These are each and collectively configured to determine when a bearer leg within the WLAN will not support a call attempt over the bearer leg and responsive to so determining, initiate the call over another bearer leg, e.g. within the LAN or the WAN. The determining includes, for example, receiving a message (703, 707, 713) that indicates or implies that the call can not be supported.