Research And Realization On IP Multicast Videoconference System Based On TAPI3.0

With the rapid development of the network technology and multimedia technology, study and application of video conferencing system have become one of the world focuses. At present, the video conferencing system demonstrates two main development trends. First, the mode of video conferencing based on private Network is developing into that based on Internet. Second, the solution of video conferencing is developing from hardware towards software. In addition, IP multicast technology is ripe, and the range of application based on multicast is more and more extensive. So it is increasingly importance for the development of the application based on multicast. The study of video conferencing system adopting Microsoft TAPI3.0 is seldom inside. And there is not a solution which aims at IE Browser. Under the background, this paper discusses how to adopt the TAPI3.0 of Microsoft to construct a set of multicast videoconferencing system based on IE Browser.This paper introduces the system construction and TAPI3.0 (Telephony Application Program Interface) Object Model of Microsoft, communication of H.323 and the service system of IP multicast conferencing in detail. And the technologies used for implementing the system are introduced, such as Windows 2000 Active Directory, DirectShow, Site Server ILS Service, etc. On these foundations, according to the project request, it describes the functions of system, network structure and the setting-up of system.The most important part of the article is to explain in detail how to utilize abundant interface functions of TAPI3.0 API COM components. With the help of them, we have realized three important modules, which are conferencing management, multicast conferencing and peer-to-peer conferencing. Finally, we provide the experimental result after finishing the test of the system. The test includes the security of system, communication capabilities and communication results. And "the attribute of depending on Mbone" and "prospect of the system" are discussed.This paper aims to provide a kind of solution to the small or middle videoconferencing system based on IE Browser, and precede the development of the application according to the desired design. Nowadays the multicast communication is in the ascendant and the study of video conferencing system based on IP is hot. So the present research work has both practical and investigative values.