Linux

The modem is one of the so called softmodems
there are a few. Try to look for linmodems.org
(chances are it is a connexant chipset)
than linuxant might have a driver for you. Mind
you connexant chooses to ignore linux and you
have to pay extra for getting the drivers from
linuxant. (The do provide a cripled driver that
can't do faxes. and high speed).

HIH,
Kind regards,
Nico Baggus

or try the tools at:
http://linmodems.org/

they have a scan tool that will grab the data to get exactly the right drivers for your modem.