asterisk users - May 2006 - Running down an echo problem on outgoing calls

Hi

I am having some echo on outgoing calls on a pstn line (made from a  
sip phone)
and am looking into some fixes involving rxgain and txgain, but
before I go down that road, I want to make sure I have everything
setup correctly.

My zapata.conf has
  cat /etc/asterisk/zapata.conf
[trunkgroups]
; define trunk groups

[channels]
; hardware channels

; default
usecallerid=yes
hidecallerid=no
callwaiting=no
threewaycalling=yes
transfer=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
signalling=fxs_ks

; define channels
context=pstn-incoming
channel => 1-4


But, when I run asterisk and ask it about the zap channels, I get  
that echo cancellation
is OFF.

zap show channel 2
Echo Cancellation: 128 taps, currently OFF

Can someone please explain this?

Thanks

Jim Freeze



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<snip>
> echocancel=yes
> echocancelwhenbridged=yes
You probably want that off, since when you bridge 2 ZAP channels you
should not have any echo.
> echotraining=yes
<snip>
> But, when I run asterisk and ask it about the zap channels, I get that echo
> cancellation is OFF.
>
> zap show channel 2Echo Cancellation: 128 taps, currently OFF
>
> Can someone please explain this?
If you check while there is no call going on on that channel, it will
of course be OFF. Better check it while there is a call going on.

hth