SDP
Short for Session Description Protocol, a protocol that defines a text-based format for describing streaming media sessions and multicast transmissions. SDP is not a transport protocol but a method of describing the details of the transmission. For example, an SDP file contains information about the format, timing and authorship of the transmission, name and purpose of the session, any media, protocols or codec formats, the version number, contact information and broadcast times.
In addition to being transport protocols, RTSP and Session Initiated Protocol also rely on SDP.
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