Session Announcement Protocol
Encyclopedia
Session Announcement Protocol (SAP) is a protocol for broadcasting multicast
session information.
A SAP listening application can listen to the SAP multicast IP address
and construct a guide of all advertised multicast sessions. SAP was published by the IETF as experimental RFC 2974.
SAP typically uses Session Description Protocol
(SDP) as the format of the session descriptions, and the multicast
sessions typically stream data using User Datagram Protocol
(UDP) or Real-time Transport Protocol
(RTP).
Multicast
In computer networking, multicast is the delivery of a message or information to a group of destination computers simultaneously in a single transmission from the source creating copies automatically in other network elements, such as routers, only when the topology of the network requires...
session information.
A SAP listening application can listen to the SAP multicast IP address
Multicast address
A multicast address is a logical identifier for a group of hosts in a computer network, that are available to process datagrams or frames intended to be multicast for a designated network service...
and construct a guide of all advertised multicast sessions. SAP was published by the IETF as experimental RFC 2974.
SAP typically uses Session Description Protocol
Session Description Protocol
The Session Description Protocol is a format for describing streaming media initialization parameters. The IETF published the original specification as an IETF Proposed Standard in April 1998, and subsequently published a revised specification as an IETF Proposed Standard as RFC 4566 in July...
(SDP) as the format of the session descriptions, and the multicast
Multicast
In computer networking, multicast is the delivery of a message or information to a group of destination computers simultaneously in a single transmission from the source creating copies automatically in other network elements, such as routers, only when the topology of the network requires...
sessions typically stream data using User Datagram Protocol
User Datagram Protocol
The User Datagram Protocol is one of the core members of the Internet Protocol Suite, the set of network protocols used for the Internet. With UDP, computer applications can send messages, in this case referred to as datagrams, to other hosts on an Internet Protocol network without requiring...
(UDP) or Real-time Transport Protocol
Real-time Transport Protocol
The Real-time Transport Protocol defines a standardized packet format for delivering audio and video over IP networks. RTP is used extensively in communication and entertainment systems that involve streaming media, such as telephony, video teleconference applications, television services and...
(RTP).