RTSP is an application-level protocol used for control over the delivery of data with real-time properties, such as audio and video streams. As defined in Internet Engineering Task Force (IETF) RFC 2326, RTSP may run over UDP, multicast UDP, or TCP. Currently, CBAC supports only TCP-based RTSP, which is supported by a variety of multimedia vendor products, including Cisco IP/TV, RealAudio G2 Player, Apple QuickTime 4 software, and RealNetworks.

RTSP may use many different data transport modes. CBAC supports the following data transport modes:

• RealNetworks Real Data Transport (RDT) RDT is a proprietary protocol developed by RealNetworks for data transport. It uses RTSP for communications control and RDT for data connection and retransmission of lost packets.

• Interleaved (tunnel mode) RTSP uses the control channel to tunnel RTP or RDT traffic.

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