[asterisk-users] fxotune vs rxgain/txgain

[Noah Miller]

Hi Matt -

> In short, fxotune adjusts line impedance, where as adjusting gains I believe
> is essentially adjusting the amplification / deamplification of the signal.
>
> http://www.voip-info.org/wiki/view/Asterisk+fxotune


Well, that clears it up a little.  I think where I get confused is
that sometimes using fxotune is called balancing the hybrid and some
times using ztmonitor and adjusting the txgain/rgain settings is
called balancing the hybrid.  Perhaps they both try to achieve the
same goal, but through different means?

This leads me to my other question - Are these two techniques mutually
exclusive?  In some posts from Matthew Frederickson, it seems that
they are, and that if you use fxotune, you should set your gains back
to zero.  Some other people seem to suggest using both fxotune and
adjusting gain levels.  I note that Stephen Bosch asked just this
question some time back, and nobody was able to answer him.

Does anybody know?

Thanks,
Noah