Patent ID: 8180393

Claim:
A method comprising: receiving into a cellular radio access network (RAN) a call request seeking to set up a call for a cellular wireless communication device (WCD) that is operating in a wireless coverage area of the RAN; responsively (i) requesting setup of a first leg of the call between the RAN and a media gateway system, and (ii) sending call setup signaling from the media gateway system to a call session control function (CSCF); making a determination of whether a location of the WCD satisfies at least one condition; if the determination is that the location of the WCD satisfies the at least one condition, then passing the call setup signaling from the CSCF to an IP PBX server that serves the WCD, to request setup of a second leg of the call from the media gateway system to the IP PBX server; and if the determination is that the location of the WCD does not satisfy the at least one condition, then signaling back from the CSCF to the media gateway system to request setup of the call back from the media gateway system to the RAN.