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Session Announcement Protocol
Session Announcement Protocol (SAP) is an experimental protocol for broadcasting multicast session information. SAP was published by the IETF as RFC 2974.
SAP typically uses Session Description Protocol (SDP) as the format for Real-time Transport Protocol session descriptions. Announcement data is sent using IP multicast and User Datagram Protocol.
Under SAP, senders periodically broadcast SDP descriptions to a well-known multicast address and port.〔(【引用サイトリンク】title=SAP (v1 & v2): Session Announcement Protocol )〕 A SAP listening application can listen to the SAP multicasts and construct a guide of all advertised multicast sessions.
==Announcement interval==
The announcement interval is cooperatively modulated such that all SAP announcements in the multicast delivery scope, by default, consume 4000 bits per second. Regardless, the maximum announce interval is 300 seconds (5 minutes). Announcements automatically expire after 10 times the announcement interval or one hour, whichever is greater. Announcements may also be explicitly withdrawn by the original issuer.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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