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Knowledge Base / Installation / What is fxotune and how do I use it?

What is fxotune and how do I use it?
Views: 10108, Votes: 2

Posted:
08 Nov, 2006 - Support D.

Updated:
08 Nov, 2006 - Support D.
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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.
Basically make sure asterisk isnt running and that zaptel and wctdm modules are loaded as fxotune needs direct access to the zap channel

CLI>stop now (just Asterisk)
followed by
#modprobe zaptel
#modprobe wctdm
#/usr/src/zaptel/fxotune -i 4
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