Session Announcement Protocol

What Does Session Announcement Protocol Mean?

Session Announcement Protocol (SAP) is used for multicast data session broadcasts and participant communication requirements. In 2000 it was published by the Internet Engineering Task Force (IETF) as Experimental Standard RFC 2974.


Techopedia Explains Session Announcement Protocol

SAP includes the following features:

  • Session Description Protocol (SDP) providing session format announcement details.
  • User Datagram Protocol (UDP) or Real-Time Transport Protocol (RTP) exchanging most multicast data sessions.
  • Scaling for unlimited receivers but not unlimited sessions.
  • It uses payload digital signature for optional announcement authentication header.

SAP has a slow announcement rate. It requires several minutes between repeated session announcements. However, this is resolved through caching at startup or local SAP proxies.


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Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…