Patent ID: 8509786
Filing Date: 2013-08-13
Classification: H04W

Abstract:
1. A communications system, comprising: a wireless enabled private branch exchange for routing and managing telephone calls to terminals in the communications system including a mobile telephone; an interface unit coupled to the wireless enabled private branch exchange for issuing a location request query to an element of a public wireless communications network to which the mobile telephone is subscribed for receiving a location request response from the element indicative of a status of the mobile telephone on the public wireless communications network, and configured to provide the location request response to the private branch exchange wherein the private branch exchange, upon receipt of the location request response, to forwards a call directed to the mobile telephone to a voicemail mailbox in the private branch exchange associated with the mobile telephone if the location request response indicating that the mobile telephone is not available to receive a call on the public wireless communications network wherein the interface unit further sends a provisioning request establishing a secondary call handling protocol in the public wireless communications network for the mobile telephone before transferring the call directed to the mobile telephone to the public wireless communications network, the secondary call handling protocol defining a call handling protocol for handling calls to the mobile telephone in response one of a busy and a no answer condition of the mobile telephone, in response to the location request response indicating that the mobile telephone is available to receive the call on the public wireless communications network.