On Mon, 18 Nov 2002, Jere Retzer wrote:
Stephen Sprunk wrote:
Any point in the US is within 25ms RTT (or less) of a major exchange; eliminating this 25ms of latency will have no effect on VoIP unless you're already near the 250ms RTT limit for other reasons.<<<
25 MS is assuming that the only delay is due to the speed of light. Add equipment, especially routers or other gear that requires manipulating packets and the delays add up quickly. I once read that the most people wil tolerate on a regular basis is around 150-180 ms. I think that is much too high for regular use
this is well studied and the numbers are not guessed they are empirical.. off top of my head its -something like- local calls 80-100ms is fine and totally unnoticable at that level, long distance people expect a little delay and 100-200ms is ok and slightly noticable and for long haul (satellite) etc people will tolerate anything up to 600ms so as you say 25ms even with extra ms for switching is fine.. Steve