asterisk users - Dec 2005 - Long and variable echo

Hi all,

Yep, I have really bad echo. I've measured it (recording in Asterisk and 
then measuring in Audacity), and it varies from 160ms to 250ms, which is far 
above what normal echo cancellation deals with. Additionally, I don't have 
Zaptel hardware, so I can't use ztmonitor as described in 
http://lists.digium.com/pipermail/asterisk-users/2004-November/071301.html 
to set my gains, not that I know of a milliwat line in Australia anyway. The 
problem has been consistent from 1.0 through CVS to 1.2, and across 
different machines and distributions. Does anyone have any suggestions on 
how I can deal with this? I have had echo cancellation happening, but 
half-duplex speech is not acceptable.

TIA,

-- 
James Andrewartha
Systems Administrator
Data Analysis Australia Pty Ltd

> The problem has been consistent from 1.0 through CVS to 1.2, and across 
> different machines and distributions. Does anyone have any suggestions 
> on how I can deal with this? I have had echo cancellation happening, but 
> half-duplex speech is not acceptable.
You're not using zaptel, what are you using to connect to the outside? 
(and is it PSTN/ISDN ?)

Can you advice on what hardware you're running, that would help..

Regards,
Kristof

We have had terrible echo when calling brisbane....where are you calling
from/to?

PaulH
Melb

----- Original Message ----- 
From: "James Andrewartha" <jamesa@daa.com.au>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users@lists.digium.com>
Sent: Monday, December 12, 2005 6:15 PM
Subject: [Asterisk-Users] Long and variable echo

> Hi all,
>
> Yep, I have really bad echo. I've measured it (recording in Asterisk
and
> then measuring in Audacity), and it varies from 160ms to 250ms, which is
far
> above what normal echo cancellation deals with. Additionally, I don't
have
> Zaptel hardware, so I can't use ztmonitor as described in
> http://lists.digium.com/pipermail/asterisk-users/2004-November/071301.html
> to set my gains, not that I know of a milliwat line in Australia anyway.
The
> problem has been consistent from 1.0 through CVS to 1.2, and across
> different machines and distributions. Does anyone have any suggestions on
> how I can deal with this? I have had echo cancellation happening, but
> half-duplex speech is not acceptable.
>
> TIA,
>
> -- 
> James Andrewartha
> Systems Administrator
> Data Analysis Australia Pty Ltd
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