Abstract: A system that processes telecommunications calls from a switch to provide call services. The system supports transactional and conversational protocols. For conversational protocols, call context is maintained at a service control point during call processing. Transactional and conversational messages are mapped to and from a generic message structure to simplify the input and output interfaces of supported service applications. Service control points comprise Communications Servers and Transaction Servers. Communications Servers are coupled by a WAN to provide distributed processing and enhance reliability and load balancing. A method processes conversational protocol messages while maintaining call context at a Communications Server. A method supports multiple-service calls by redirecting processing from one Service Application executing on an original service control point to another Service Application without communicating with the originating switch between services.