Echo is fairly common on analogue lines. You generally don't hear it
because a) the carriers echo cancel long distance circuits, or b) the
echo is coming from an end point that is local to you, and thus has no
noticeable latency. Add a VoIP phone, and you'll always have some
latency. (there are more factors to echo than this, and the stranger it
gets the harder it is to get rid of).
The software echo can in asterisk will handle a certain amount of echo,
but not everything. Unfortunately, if you get echo that the software
can't handle, you are not going to get rid of it easily.
Keep in mind that most of your echo problems are caused by the quality
of the gear at the far end. You can't control the far end, so you want
to have gear that can handle whatever is thrown at it.
It all comes down to what your users are willing to tolerate. For me,
it's just not an option. We use echo cans on all PSTN circuits, all the
time. We don't even give the customer the choice. It's really not that
expensive. If you look at the life of the card, and the price of the
echo can, you are looking at a few bucks a month to all but eliminate
echo. It's pretty cheap insurance.
Jim
Bruce Nik wrote:
Hello,
I have a quick question to ask. Has Sangoma A200 or A400 ever failed you that you have to jump A200d or A400d?
Thanks,
Bruce
_________________________________________________________________
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Jim Van Meggelen
[email protected]
http://www.oreillynet.com/pub/au/2177
"A child is the ultimate startup, and I have three.
This makes me rich."
Guy Kawasaki
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