An Intelligent Signaling Transfer Point (ISTP) of the common channel interoffice signaling (CCIS) network provides high level control of signaling message routing and of processing of calls relating to telephone services, broadcast services, interactive broadband services and packet switched data services....http://www.google.es/patents/US5592477?utm_source=gb-gplus-sharePatente US5592477 - Video and TELCO network control functionality
