The role of service brokers for composed services in an open service environment

SOA principles have been used in telecommunications domains for many years. Today, Web Services-based APIs including emerging Web 2.0 interfaces represent the state-of-the-art in SOA-based telecommunications, which are going to be integrated with the emerging 3GPP IP Multimedia Subsystem and ETSI TISPAN NGN architecture. In this report we describe mechanisms of a service architecture on top of telecommunications networks based on SOA principles with special emphasis on service exposure and discovery and the possibility to compose complex services from basic service enablers for a growing open service market as it is currently implemented at the Open SOA Telco Playground at Fraunhofer FOKUS.