As part of the DECOS architecture, this paper presents a generic framework for gateways, which enable message ex- changes across application subsystem boundaries in order to exploit redundancy and to coordinate the behavior of ap- plication subsystems. In the DECOS architecture, networks of different application subsystem can exhibit property mis- matches, such as different protocols (e.g., CAN protocol vs. time-triggered communication), divergent syntax, and incoherent naming. Gateways provide a systematic solu- tion for resolving these property mismatches. Within a gate- way, a real-time database separates the application sub- systems and stores temporally accurate real-time images. Controlled by a formal gateway specification based on an extension of timed automata, a gateway acquires messages from one gateway side to update these real-time images and recombines the real-time images into messages for the other gateway sides. In a prototype implementation, development tools use such a formal gateway specification expressed as a UML model as an input and automatically generate a con- figuration module for the parameterization of a generic ar- chitectural gateway service to a specific application.1