The Intelligent Gateway (IG) is a Research and Development (R&D) effort to design an algorithm to provide computer-aided routing of ACP-123/X.400 messages by a United States Coast Guard (USCG) Communications Area Master Station (CAMS). The algorithm is designed to be implementation independent; i.e. it is not dependent on a particular programming language, methodology, or hardware platform. The IG development is a proof-of-concept effort and is not intended to be fielded as a stand alone Defense Message System (DMS) component. Instead the USCG is working with the U.S. Navy and DMS product vendors to incorporate IG functionality into future Commercial Off-The-Shelf (COTS) DMS products.