Patent ID: 7406330
Filing Date: 2008-07-29
Classification: H04M,H04W

Abstract:
1. 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 cellular RAN includes a base station that radiates to define the wireless coverage area and a mobile switching center (MSC) that is communicatively linked with the base station; responsively (a) engaging in first call setup signaling between the cellular RAN and a media gateway system to set up a first leg of the call between the cellular RAN and the media gateway system, (b) identifying an IP PBX system that serves the cellular WCD, and (c) engaging in second call setup signaling between the media gateway system and the IP PBX system to set up a second leg of the call between the media gateway system and the IP PBX system; and setting up the call from the IP PBX system for the cellular WCD wherein the media gateway system includes a media gateway (MGW) and a media gateway controller (MGC), where engaging in the first call setup signaling between the cellular RAN and the media gateway system to set up the first leg of the call comprises engaging in the first call setup signaling between the MSC and the MGC to set up the first leg of the call between the MSC and the MGW, and wherein engaging in the second call setup signaling between the media gateway system and the IP PBX system to set up the second leg of the call comprises engaging in the second call setup signaling between the MGC and the IP PBX system to set up the second leg of the call.