Hardware

Hi all,

My question is two-fold.  Firstly, can I use a USB ISDN TA with m0n0wall to dial on demand?  I have a Chronos branded adaptor.

Secondly, how can I tell m0n0wall to dial only when the primary link is down?  I don't want the ISDN to be connected all the time, since the connect charges are hefty!   Of course, once the primary link is up again, the ISDN bust disconnect automatically.   

thanks