Session Announcement Protocol
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The Session Announcement Protocol (SAP) is a protocol for broadcasting multicast session information.
A SAP listening application can listen to the well-known SAP multicast address and construct a guide of all advertised multicast sessions. SAP was published by the IETF as RFC 2974 (http://www.ietf.org/rfc/rfc2974.txt).
SAP typically uses session description protocol (SDP) as the format of the session descriptions, and the multicast sessions typically use Real-time Transport Protocol (RTP).