A SIP-Based Programming Framework for Advanced Telephony Applications

Abstract. The scope of telephony is significantly broadening, providing users with a variety of communication modes, including presence sta-tus, instant messaging and videoconferencing. Furthermore, telephony is being increasingly combined with a number of non-telephony, heteroge-neous resources, consisting of software entities, such as Web services, and hardware entities, such as location-tracking devices. This heterogeneity, compounded with the intricacies of underlying technologies, make the programming of new telephony applications a daunting task. This paper proposes an approach to supporting the development of ad-vanced telephony applications. To do so, we introduce a declarative lan-guage over Java to define the entities of a target telephony application area. This definition is passed to a generator to produce a Java program-ming framework, dedicated to the application area. The generated frame-works provide service discovery and high-level communication mecha-nisms. These mechanisms are automatically mapped into SIP, making our approach compatible with existing SIP infrastructures and entities. Our work is implemented and has been validated on various advanced telephony applications.