Programming Internet telephony services

Internet telephony enables new service possibilities. With a wide range of services possible, it becomes critical to provide means for rapidly conceiving, developing, and deploying them. This critical problem is analyzed. These services are realized through Internet telephony signaling protocols. The design decisions necessary in developing a programming mechanism and the two solutions required to solve the problem are discussed. The first solution requires service creation by trusted users, the common gateway interface, while the second requires service creation by untrusted users, the call processing language.