Modeling and verification of a telecommunication application using live sequence charts and the play-engine tool

We apply the language of live sequence charts (LSCs) and the Play-Engine tool to a real-world complex telecommunication service. The service, called Depannage, allows a user to make a phone call and ask for help from a doctor, the fire brigade, a car maintenance service, etc. This kind of service is built on top of an embedded platform, using both new and existing service components. The complexity of such applications stems from their distributed architecture, the various time constraints they entail, and the fact the underlying systems are rapidly evolving, introducing new components, protocols and associated hardware constraints, all of which must be taken into account. We present the results of our work on the specification, animation and formal verification of the Depannage service, and draw some initial conclusions as to an appropriate methodology for using a scenario-based approach in the telecommunication domain. The complete specification of the Depannage application in LSCs and some animations showing simulation and verification results are made available as supplementary material.