If you indeed have one of these messy Winmodems, you will have to buy a fully functioning modem to use it with Linux. Winmodems require software to do some of the work that most modems normally do themselves. You can pick a good one for under $100 U.S.
<snip> | one of debian documents winmodem is not supported by linux ppp. I use US | Robotics 56 K VoiceWin modem? is it true? Eric G. Miller Powered by the <A HREF="http://www.debian.org">POTATO</A>!