Archived from groups: comp.dcom.voice-over-ip (More info?
>Are there particular types of Voice Modems compatible with Asterisk?
Yes, the one that they sell as the old FXO card. Otherwise, no.
>Could one use a voice modem and patch it into the soundcard to use the
>analog modem over VoIP?
Seems like a tangle of hack to get away from pay $99 (or $25 if you
are cheap and don't want to pay Digium) to do it the right way and
just get a properly supported card.