Method and System for Selective Application of Cellular-PBX Integration Service

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, wherein the call is a call to a called party;
• receiving together with the call request a directive of whether or not to apply cellular-PBX integration service for the call;
• responsively making a determination of whether the WCD is currently checked-into a cellular-PBX integration service to which the WCD subscribes, wherein if the directive is to apply cellular-PBX integration service for the call, then the determination is that the WCD is checked into the cellular-PBX integration service, and if the directive is to not apply cellular-PBX integration service for the call, then the determination is that the WCD is not currently checked-into the cellular-PBX integration service;
• if the determination is that the WCD is currently checked-into the cellular-PBX integration service, then setting up the call to an IP PBX server that serves the WCD;
• and
• if the determination is that the WCD is not currently checked-into the cellular-PBX integration service, then setting up the call to the called party without setting up the call to the IP PBX server.

A system comprising:

• a cellular radio access network (RAN) comprising a base station that radiates to produce a wireless coverage area;
• subscriber profile data indicating whether a cellular wireless communication device (WCD) is currently checked-into or checked-out of a cellular-PBX integration service to which the WCD subscribes;
• a media gateway system;
• a call session control function (CSCF) arranged to engage in signaling communication with the media gateway system;
• and
• an IP PBX server arranged to serve a plurality of enterprise telephone stations that are situated on an enterprise packet-switched network, the IP PBX server being further arranged to engage in signaling communication with the CSCF and bearer communication with the media gateway system,
• wherein the RAN receives a request to set up a call for the WCD when the WCD is operating in the wireless coverage area and, responsive to the profile data indicating that WCD is currently checked-into the cellular-PBX integration service, the RAN sets up the call to the media gateway system for connection of the call in turn to the IP PBX server.