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Session Description Protocol (SDP) is used to describe multimedia sessions in a format understood by the participants over a network. Depending on this description, a party decides whether to join a conference or when or how to join a conference.

1. SDP is normally contained in the body part of Session Initiation Protocol mostly called SIP.

2. The owner of a conference publicizes it over the network by sending multicast messages which contain description of the session e.g. the name of the owner, the name of the session, the coding, the timing etc. Depending on these information the recipients of the advertisement take a decision about participation in the session.

3. SDP is defined in RFC 2327. An SDP message is composed of a series of lines, called fields, whose names are shortened by a single lower-case letter, and are in a required order to simplify parsing.

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