A convergent service is defined as a service that exploits the convergence of
communication networks and at the same time takes advantage of features of
the Web. Nowadays, building up a convergent service is not trivial, because
although there are significant approaches that aim to automate the service
composition at different levels in the Web and Telecom domains, selecting
the most appropriate approach for specific case studies is complex due to
the big amount of involved information and the lack of technical considerations.
Thus, in this paper, we identify the relevant phases for convergent
service composition and explore the existing approaches and their associated
technologies for automating each phase. For each technology, the maturity
and results are analysed, as well as the elements that must be considered
prior to their application in real scenarios. Furthermore, we provide research
directions related to the convergent service composition phases