Patent ID: 8112545

Claim:
A private communications network comprising: an end system configured to communicate with a remote system via a network separate from the private communications network, the end system configured to communicate in at least a voice stream mode and a data stream mode; a first network application server configured to receive a voice stream request sent by the end system, the first network application server including a first pool of addresses stored in a first address mapping table, and configured to generate a first address mapping responsive to the voice stream request; a second network application server configured to receive a data stream request sent by the end system, the second network application server including a second pool of addresses stored in a second address mapping table, and configured to generate a second address mapping responsive to the data stream request, wherein the second pool of addresses differs from the first pool of addresses; and a packet modifier device, separate from the first and second network application servers and configured to receive the first address mapping from the first network application server when the end system sends the voice stream request and the second address mapping from the second network application server when the end system sends the data stream request, and to use the received address mapping to map communication packets from the end system for transmission on the separate network, wherein the first network application server and the second network application server are not in a path of the communication packets.