[asterisk-users] Echo on Sangoma A400 and background noise

[cb]

On Sep 15, 2010, at 6:10 PM, Al lists wrote:

> we tried to use fxtune but looks like it wont work with Sangoma  
> card, ( please correct me if i'm wrong)
> Echo is really bad and also we have  background noise on all lines.
> We tried both mg2 and oslec echo canceler.


I've only used Sangoma with hardware echo cancelation, but I did find  
I had to manually tune my cards. In my case using a test tone number  
was of no help, rather I just listened in on calls in progress and  
used ztmonitor to see where the levels were and adjusted things until  
I had a good level and the sound quality was acceptable.

Until I did the manual tuning I had serious issues of static and  
background noise on several lines, but not all. I don't blame this on  
the Sangoma card, but rather on the line quality as I run Sangomas in  
other locations and have never had to do any tuning there, they have  
just worked.

-chris
<www.mythtech.net>