Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions

The information below is for an old version of the document
Document Type Expired Internet-Draft (avtcore WG)
Last updated 2015-09-24 (latest revision 2015-03-23)
Replaces draft-perkins-avtcore-rtp-circuit-breakers
Stream IETF
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
Document shepherd Magnus Westerlund
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Real-time Transport Protocol (RTP) is widely used in telephony, video conferencing, and telepresence applications. Such applications are often run on best-effort UDP/IP networks. If congestion control is not implemented in the applications, then network congestion will deteriorate the user's multimedia experience. This document does not propose a congestion control algorithm; instead, it defines a minimal set of RTP "circuit-breakers". Circuit-breakers are conditions under which an RTP sender needs to stop transmitting media data in order to protect the network from excessive congestion. It is expected that, in the absence of severe congestion, all RTP applications running on best-effort IP networks will be able to run without triggering these circuit breakers. Any future RTP congestion control specification will be expected to operate within the constraints defined by these circuit breakers.


Colin Perkins (
Varun Singh (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)