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Session Description Protocol

Session Description Protocol

SDP provides a format for describing the session information such as interfaces where the media must terminate and the type of media formats that can be supported. SDP is normally transported as the message body in the SIP methods already discussed. The structure of the protocol is based around the session and media streams that will be supported in the session. Consequently some of the SDP information relates to the overall session, and is known as session level parameters. This information may include the originator of the session and the time it will commence. The media level parameters on the other hand relate to the individual media streams and include information such as media types, transport protocols and port numbers.

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