Maximum Delay for an IPT Solution

Unanswered Question
jgross Thu, 02/08/2007 - 02:50


One-way transmit delay should not exceed 150 ms (per G.114 recommendation).



Paolo Bevilacqua Thu, 02/08/2007 - 03:43

Do not take the 150ms as an hard limit all the time.

I was on a skype conversation yesterday that had an average roundtrip of about 1 sec, plus the peer-to-peer routing by skype that I'm unable to evaluate. We were able keep an almost normal conversation after all, altought at the same time the delay was noticeable. I routinely call across the Ocean with a cisco solution and you cannot tell the difference with calling next room

I think that the time the recommendations were written, no advantaged de-jitter and echo cancellation algorithms were largely available as today. I find that they do an excellent job at concealing delay, packet loss, etc.


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