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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 4`) 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.
NOTE: The digit after the -i option is the digit that will break dialtone on the line.
As always, if you have any questions, you can email me at creslin@NOSPAMdigium.com
Matthew Fredrickson
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