A system and method is provided that includes a communication system for handling Session Initiation Protocol (SIP) messages. The system includes a plurality of first servers for processing a first and a second message. The system also includes a plurality of second servers, which may include a mapping/correlating function for receiving the first message from a client and sending the first message to the plurality of first servers based on associating the first message with a resource. The second message received from the plurality of first servers is sent to the client based on stored routing information associated with the client, whereby the stored routing information resides within the plurality of second servers.