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RTSP Short for Real Time Streaming Protocol, a proposed standard for controlling streaming data over the World Wide Web. RTSP grew out of work done by Columbia University, Netscape and RealNetworks and has been submitted to the IETF for standardization.

Like H.323, RTSP uses RTP (Real-Time Transport Protocol) to format packets of multimedia content. But whereas H.323 is designed for videoconferencing of moderately-sized groups, RTSP is designed to efficiently broadcast audio-visual data to large groups.