[Asterisk-Users] POTS fail-over?

[Andrew Kohlsmith]

> Breaking out my trusty PIC programmer, I could probably do line-voltage
> detection and automatically latch the relay once the incoming line is
> idle... But like I said, overkill for my app :)

Yes, using a microcontroller is WAY overkill -- especially when a simple LM324 
comparator and a handful of discretes would do it for you.  :-)

-A.