Session Announcement Protocol (SAP) is a protocol for broadcasting multicast session information. For other senses of this word, see protocol. ... Routing Schemes anycast broadcast multicast unicast Multicast is sometimes also used to refer to a multiplexed broadcast, although that is a very different thing and should not be confused. ...
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 IEF as RFC 2974. This article needs to be cleaned up to conform to a higher standard of quality. ...
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). Session Description Protocol (SDP), is a format for describing streaming media initialization parameters. ... Routing Schemes anycast broadcast multicast unicast Multicast is sometimes also used to refer to a multiplexed broadcast, although that is a very different thing and should not be confused. ... The Real-time Transport Protocol (or RTP) defines a standardized packet format for delivering audio and video over the Internet. ...
The announcement is multicast with the same scope as the session it is announcing, ensuring that the recipients of the announcement are within the scope of the session the announcement describes (bandwidth and other such constraints permitting).
A SAPannouncement is multicast with the same scope as the session it is announcing, ensuring that the recipients of the announcement are within the scope of the session the announcement describes.
Sessionannouncements that are encrypted with a symmetric algorithm may allow a degree of privacy in the announcement of a session, but it should be recognized that a user in possession of such a key can pass it on to other users who should not be in possession of such a key.
SessionAnnouncement A sessionannouncement is a mechanism by which a session description is conveyed to users in a proactive fashion, i.e., the session description was not explicitly requested by the user.
SAP provides both encryption and authentication mechanisms but due to the nature of sessionannouncements it is likely that there are many occasions where the originator of a sessionannouncement cannot be authenticated because they are previously unknown to the receiver of the announcement and because no common public key infrastructure is available.
Session descriptions may be parsed at intermediate systems such as firewalls for the purposes of opening a hole in the firewall to allow the participation in multimedia sessions.
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