Hi
On Thu, Jul 10, 2008 at 01:45:02AM +0200, Udo Schacht-Wiegand wrote:
> Hi,
>
> we have a strong echo on an Astribank running on
> Asterisk 1.2.29-BRIstuffed-0.3.0-PRE-1y-s
> The echo is on the opposite site of the analogue phones
> connected to the Astribank.
So this is an FXS module.
>
> I tried to use fxotune. It is a production system, so I cannot
> shutdown Asterisk for long, I did:
>
> CLI> zap destroy channel 120
>
> and then:
>
> # fxotune -vvv -i -b 120 -e 120
> Tuning module /dev/zap/120
> Unable to set impedance on fd 4
> Failure!
> Unable to tune 1 devices, even though those devices are present
>
> What can I do to use fxotune?
fxotune only works with FXO modules. It helps reducing the generated
echo by tuning some knobs on the analog/digital conversion chip of the
FXO port. Those knobs are rather specific to that chip.
For starters, do you have echo cancellation enabled?
asterisk -rx 'zap show channel 120' | grep 'Echo'
--
Tzafrir Cohen
icq#16849755 jabber:[EMAIL PROTECTED]
+972-50-7952406 mailto:[EMAIL PROTECTED]
http://www.xorcom.com iax:[EMAIL PROTECTED]/tzafrir
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