Real-time distributed applications complexity is steadily increasing. A well-known technique used to manage such complexity consists in decomposing the whole system in different quasi-independent distributed subsystems. Inter-subsystem communication, when necessary, is performed via gateway nodes that filter in and outgoing traffic. For real-time systems, this architecture poses additional design challenges, since it becomes necessary to consider both intra and inter-network message exchanges with real-time constraints. In the work carried out so far, the FTT communication paradigm has been provided with tools for supporting flexible real-time communication on isolated networks. This work presents a first approach to incorporate multi-segment support into the FTT protocol family. Particularly, two approaches are presented, analyzed and compared, which allow breaking end-to-end deadlines into parameters that are local to each one of the interconnected networks.