Teodor is partially correct in that you can use a gatekeeper, softswitch or the Quintum call relay to route calls to the individual Tenors, however, each will still need its own IP address. The difference is that with a gatekeeper, softswitch or call relay that has the correct features, you can assign the tenors private IP and the above units can translate the incoming public IP to one of the 2 private IP addresses of the Tenors.