An application compositor enables the creation a sequence of SIP and HTTP servlets that comprises a converged multi-protocol application. Applications are constructed based on rules that declaratively specify a multi-protocol sequence of servlets and the transitions between the servlets, minimizing programmer effort. The application compositor works with a servlet container within an application server to determine the sequence of servlets to be executed by the servlet container when running the application, and is called by the servlet container to perform transitions between servlets.