[asterisk-users] fxotune: Unable to set impedance

[Udo Schacht-Wiegand]

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.

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?

Udo