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Q. I have echo problems on my FXO modules and I've tried the different
echo cancellation algorithms in zconfig.h, tried tweaking the gains, and
still nothing works. What can I do?
A. Use the fxotune utility.
To use:
Just run the fxotune utility with the -i option. (`fxotune -i`) It should
discover which zap channels are FXO modules and tune them accordingly. Be warned
however, it takes a significant amount of time for EACH module to test, I would
say somewhere around 2-3 minutes. But you only have to initialize it once for
the line. It will write a configuration file to /etc/fxotune.conf. You will
need to have your system run fxotune with the -s flag (`fxotune -s`) to set the
module with the previously discovered values from fxotune.conf for it to take
affect, so essentially if each time you reboot the machine you need to run
`fxotune -s`. You might consider putting it in your startup scripts some time
after the module loads and before asterisk runs.
As always, if you have any questions, you can email me at creslin@NOSPAMdigium.com
Matthew Fredrickson
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