[asterisk-users] Snom 300 Echo

[Brent Davidson]

I thought I had the echo out of the system, but it keeps coming back...  
What I'm being told is that when the users call out from their snom 
phones they hear their own voice.  There's no delay, but it's extremely 
loud.  If I cut their mic volume down to the point where the sidetone is 
not a problem the person on the other end can't hear them, or tells them 
they sound like they are "down in a well".  They say the problem is not 
there on incoming calls.  I spent half a day navigating the maze of 
Verizon phone numbers and finally got to someone who gave me the Type 
102 test line numbers and I calibrated the gains as close to 14844 as 
possible and it still does not seem to have any effect on the echo.  Is 
there a setting in the Snom phone that I am missing?  These phones are 
running Firmware version 7.1.30, and I've been through them forward and 
backwards and can't seem to find anything to adjust the echo 
suppression.  The thing that makes this even worse is that I have tried 
many many tests of my own and can't seem to replicate the echo 
conditions.  They always seem to show up when I am at a different 
office.  My test Snom 300 phone that I keep here at my desk and connect 
to each of the branch office servers as needed never seems to have the 
echo/sidetone problem.  I need some help figuring this out.

Thanks,
Brent Davidson



Brent Davidson wrote:
> We're deploying an asterisk-based phone system at all of our branch 
> offices in an effort to eliminate long-distance costs incurred from the 
> constant branch to branch calls.  We're using the Snom 300's at all 
> offices for the desk phones and X100P cards to interface to 2 analog 
> lines.  I'm having a problem tuning all the echo out of the system.  So 
> far two branches are using the new system and they are both reporting 
> echo on both incoming and outgoing calls.  The echo seems to be confined 
> to the Snom 300 phones and is not heard by the person on the zap line.  
> The echo is only the voice of the person using the Snom phone.  There 
> doesn't seem to be any echo of the analog line audio.  I have tried 
> adjusting the gain of the lines, turning on echo cancellation, Turning 
> on echo training and nothing seems to work.  At one of the branches, I 
> re-compiled asterisk and zaptel using the OSLEC drivers and that doesn't 
> seem to have had any effect either.  What am I missing?
>
> Thanks,
> Brent Davidson
>
> _______________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
>
>
>