Abstract: A method and system for selectively applying a cellular-PBX integration service. When a radio access network (RAN) receives a call request for a served wireless communication device (WCD), call setup signaling passes to a call session control function (CSCF), and a determination is made as to whether the WCD is currently checked-into or checked-out of the cellular-PBX integration service. If the WCD is checked-in, the call is set up to an IPPBX server for handling. If the WCD is checked-out, the call is set up back to the RAN for handling. Similarly, the CSCF may receive call setup signaling in response to a call dialed to an IPPBX extension associated with the WCD, and the check-in/check-out status of the WCD may be used as a basis to decide whether to send the call to the RAN for handling or whether to return the call to the IPPBX server for handling.

Abstract: A method and system for selectively applying a cellular-PBX integration service. When a radio access network (RAN) receives a call request seeking to set up a call for a cellular wireless communication device (WCD) that is operating in the coverage area of the RAN, a determination is made as to whether the WCD is currently checked-into a cellular-PBX integration service. A service control point (SCP), for instance, may make the determination. If the determination is that the WCD is currently checked-in, then the call is set up to an IP PBX server that services the WCD, and the IP PBX server may then handle the call as it would handle a call placed to any IP PBX extension. Further, differential billing can be applied, charging an enterprise billing-account for the call if the WCD is checked-in, and charging a WCD billing-account for the call if the WCD is not checked-in.

Abstract: A method and system for using location of a cellular wireless communication device (WCD) as a basis to restrict application of a cellular-PBX integration service. In one embodiment, a radio access network (RAN) serving the WCD receives a call request for the WCD, and, based on the WCD's location, a determination is made as to whether the call should be set up to an IP PBX server that serves the WCD, to allow the IP PBX server to handle the call. In another embodiment, an IP PBX server serving a WCD receives a call request and responsively signals to a call session control function (CSCF), and the CSCF or a policy server decides based on the WCD's location whether the call should be set up to the RAN that serves the WCD, to allow the RAN to handle the call.

Abstract: A method for dynamically selecting a voice mail system to receive a call on behalf of a cellular wireless subscriber. A radio access network (RAN) receives a voice mail call request, and a policy server determines which of a plurality of voice mail systems should receive the call from the media gateway system. The policy server can make this determination based on user profile logic and/or by voice interaction with the caller. In one embodiment, the determination may be whether to set up the call to a voice mail system provided by the subscriber's wireless carrier or rather whether to set up the call to a voice mail system provided by an enterprise that serves the subscriber.

Abstract: A method for using an account balance to limit application of cellular-PBX integration service. A cellular wireless communication device (WCD) will be allotted a quantity of cellular-PBX integration service, such as a number of minutes of use per month for instance. The quantity will be decremented a the WCD uses the service, and the WCD may be precluded from benefiting from the cellular-PBX integration service upon exhaustion of the balance. In one embodiment, for instance, when a radio access network (RAN) that serves the WCD receives a call request for the WCD, the account balance can be used as a basis to decide whether to pass the call to an IP PBX server that serves the WCD or whether to have the RAN handle the call.