Andrew Kohlsmith wrote:
On Friday 16 December 2005 08:12, Florian Overkamp wrote:
Although it's a bit unclear how things evolved exactly (since no-one
ever tells us), a number of interconnection points throughout the
country were consolidated, significantly increasing the chance that
delay exceeded 128 taps.
I need to do some investigation of bringing the tap count WELL above that...
I'd like to see what kind of performance we can get with 128 MILLISECOND
tail... 128 taps is only 16ms... and 16ms of echo cancel is damn near
useless, as it's fast enough that you'd likely not even hear the echo as
anything more than a sidetone anyway.
I imagine it's deathly hard on the CPU though. :-)
Actually, the problem is different. If you receive an echo on the PSTN
gateway that has a 16ms echo, the problem would not be noticeable there,
but if you then add a VoIP connection the delay added would make the
echo audible.
Florian
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