Thanks Steve, it is good to know that going to the digium card is likely
to reduce the echo.
As you say, it is much cheaper than Sagoma. Here in Canada the Digium
FXO board is just under $100 but a suitable Sagoma with FXO, FXS and
hardware echo can is about $650 !
Mike
Steve Jones wrote:
I went through the same thing on my home system a couple months ago, and
asked similar questions.. The "conventional wisdom" is that "it
depends"... It depends on your local loop length, quality, taps on the
line, etc..
It seems that most people who have the sangoma cards with hardware echo
cancellation are happy, but I didn't have that kind of money to spend on
my home system, so I bought the TDM400 card. In my case, I bought two
FXO and one FXS.... Also just "in my case", the difference was huge -
All of a sudden my echo problems were gone. So, although I probably
would have been better off with the hardware echo, in my particular
case, the Digium works great, and did make a huge difference over the
voice modem I had been using.
Just for comparisons sake, my two FXOs are connected to: 1 Vonage ATA
(Motorola), and one Verizon pots line. I am about 2.5 miles from the
CO, but I don't know the path that the cable takes, or if there's a SLC
somewhere, so I don't know how long the loop is. The line is DSL
qualified, so I don't think there's a SLC, but I'm not positive..
Since you've already got the card, you'd probably be able to get the FXO
for around $65, right? I'd say that is your best bet, with very little
money risked..
Good luck!!
-Steve
-----Original Message-----
From: M.Hockings [mailto:[EMAIL PROTECTED]
Sent: Saturday, June 17, 2006 1:23 AM
To: [email protected]
Subject: [Asterisk-Users] Echo and crackle
We are running asterisk with a single POTS line for local calls and a
voip line for long distance. Whenever we receive a call on the POTS
line it is more than likely, but not always, going to have significant
distracting echo. In addition to that there is occasional heavy crackle
or static. I have tried to follow the guidelines at :
http://www.voip-info.org/wiki/view/Asterisk+echo+cancellation
but it does not seem to have made much difference.
Currently we are using a X101P for the POTS line and a TDM401B (TDM400P
with one FXS port) for the conventional telephones. From what I have
read, it may help to use an FXO port on the TDM400P rather than the
X101P for the POTS line.
What is the "conventional wisdom" about the echo in this configuration
and what causes the crackle and how should I tackle that? I have tried
rebooting/power-cycling the machine to reset the hardware but it really
hasn't noticeably helped.
Is there anything else that I can try?
Thanks, Mike
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