So this is supposed to be for severe situations only, i.e. we want to avoid a false positive... the draft says: The congestion circuit breaker is therefore: when RTCP RR packets are received, estimate the TCP throughput using the above equation and the measured R, p (approximated by the loss fraction), and s. Compare this with the actual sending rate. If the actual sending rate has been more than an order of magnitude greater than the throughput equation estimate for two or more RTCP reporting intervals, stop transmitting. (where "the above equation" is the TCP throughput equation) but in the presentation today, a statement about reacting when you have reached 10 * that value was made. This means that the stream would stop sending when it's as aggressive as 10 TCP flows... on a host where there can easily be many more flows than that active in parallel with the RTP stream, I wouldn't judge that as a "circuit breaker" condition. My simple suggestion is to pick a much higher value, say 100? Cheers, Michael