1. A method of operating a communication system comprising a routing system and a call processing system that is configured to communicate with more than one call manager systems, the method comprising: in the routing system, receiving signaling for a call wherein the signaling indicates a called number including an international country code; processing the international country code to transfer a first query including the international country code from the routing system to the call processing system; in the call processing system, processing the international country code to select one of the call manager systems from the more than one call manager systems; transferring a second query to the one call manager system; receiving a response from the one call manager system; and processing the remote processor response to transfer a routing instruction for the call.