asterisk users - Oct 2003 - Echo on remote end when using NuFone

I'm testing out my SNOM 200 phone by trying to call out through NuFone. 
When I do so, I don't hear an echo at all (in fact I can't hear myself 
through the phone) but the callee can hear an echo when she speaks. NuFone 
tells me their network is totally digital and so can't be involved in an 
echo. This is all well and good, but the echo is still there. Any suggestions?

As a separate issue, I am hearing a bad echo when using my Digium X100P to 
connect to the PSTN. I've tried tweaking the tx/rx gain to no real effect. 
I've also tried changing the volume on the SNOM phone, changing the codec 
to g711u, and decreasing the packet size. Any other things to try?

Thanks,
--Ernest

I have the same problem and it was solved setting:

# Uncomment for aggressive residual echo supression under
# MARK2 echo canceller
#
KFLAGS+=-DAGGRESSIVE_SUPPRESSOR

 in the makefile of zaptel and recompiling.

miklos


----- Original Message ----- 
From: "Ernest W. Lessenger" <ernest@oacys.com>
To: <asterisk-users@lists.digium.com>
Sent: Friday, October 31, 2003 4:21 PM
Subject: [Asterisk-Users] Echo on remote end when using NuFone

> I'm testing out my SNOM 200 phone by trying to call out through NuFone.
> When I do so, I don't hear an echo at all (in fact I can't hear
myself
> through the phone) but the callee can hear an echo when she speaks. NuFone
> tells me their network is totally digital and so can't be involved in
an
> echo. This is all well and good, but the echo is still there. Any
suggestions?
>
> As a separate issue, I am hearing a bad echo when using my Digium X100P to
> connect to the PSTN. I've tried tweaking the tx/rx gain to no real
effect.
> I've also tried changing the volume on the SNOM phone, changing the
codec
> to g711u, and decreasing the packet size. Any other things to try?
>
> Thanks,
> --Ernest
>
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>