An automatic method for adding an additional data stream, such as auxiliary teleconference data, to an existing media connection between two endpoints, such as a teleconference between teleconferencing systems. A first endpoint identifies the availability of a second data stream to a ...http://www.google.com.au/patents/US5854898?utm_source=gb-gplus-sharePatent US5854898 - System for automatically adding additional data stream to existing media connection between two end points upon exchange of notifying and confirmation messages therebetween 
