A communication network comprising a plurality of border controllers, a first packet voice network, a second packet voice network coupled to the first packet network by the plurality of border controllers, and a master border controller coupled to the plurality of border controllers and coupled to the first packet voice network and the second packet voice network. The master border controller, responsive to receiving a query from a switch in the first packet voice network for a call between the first and second packet voice networks, processes the query to determine a first border controller for the call of the plurality of border controllers, and transfers a response to the switch in the first packet network wherein the response indicates the first border controller.