The U on iTunes U - Terms

RTP (Real-Time Streaming Protocol)

The Real Time Streaming Protocol (RTSP) is a protocol for use in streaming media systems which allows a client to remotely control a streaming media server, issuing VCR-like commands such as "play" and "pause", and allowing time-based access to files on a server.

Most RTSP servers use the standards-based RTP as the transport protocol for the actual audio/video data. The protocol is similar in syntax and operation to HTTP but RTSP adds new requests. While HTTP is stateless, RTSP is a stateful protocol. A session ID is used to keep track of sessions when needed. This way, no permanent TCP connection is needed. RTSP messages are sent from client to server, although some exceptions exist where the server will send to the client.

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