The IESG has approved the following document: - 'Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions' (draft-ietf-avtcore-rtp-circuit-breakers-18.txt) as Proposed Standard This document is the product of the Audio/Video Transport Core Maintenance Working Group. The IESG contact persons are Alexey Melnikov, Ben Campbell and Alissa Cooper. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-ietf-avtcore-rtp-circuit-breakers/ Technical Summary 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 acts as a safety measure to prevent starvation of network resources denying other flows from access to the Internet, such measures are essential for an Internet that is heterogeneous and for traffic that is hard to predict in advance. 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. Working Group Summary The WG has been quite diligent in working on this. There has been discussion if the specification addresses the right issue, and if the perimeter behavior it establish is the appropriate one. That consensus is definitely a rough consensus. A very good number of people have commented on the specification. Document Quality There has been significant input, including simulations both for wired and wireless networks, the result of these simulations are referenced by the specification. Simon Perreault at JIVE did a trial deployment in their service. All of this has helped improving the solution and its definition significantly and helped verifying the behavior of the circuit breakers. Personnel Magnus Westerlund is the document shepherd. Responsible AD is Ben Campbell
