[Asterisk-Users] Zap channels ringing too loudly

[Wilson Pickett]

>  I could be way off here, but I thought FXS ringing was signaled only
> by a change in voltage on the pair, so I'm not sure how zaptel could
> instruct the hardware device to send a different voltage? I think its
> only capability with FXS is to fluctuate the voltage to support
> distinctive rings.

There may be cadences to adjust. It depends too on the country.