RTSP

Short for Real Time Streaming Protocol, a standard for controlling streaming data over the World Wide Web.

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.

RTSP grew out of work done by Columbia University, Netscape and RealNetworks.