....they have info that can help you determine what type of modem you have.
Here's quick ideas:
1. If you have Windows running on that machine you can check under Device Manager.
2. Under linux "lspci -v" will list all devices attached to your PCI bus and will tell you what you have. I have a winmodem in both my laptop (Thinkpad 600X) and my desktop and both are listed with lspci.
3. Failing that turn it off, open the case, and look at the modem.
4.Your final option is to hit the support site for whoever built your machine and see if your machine's specs are listed there.
Once you know your modem manufacturer go to linmodems.org and see if they have anything to help you get yours going. My laptop uses some sort of Lucent modem and my desktop is some sort of PCTel chip modem, and that site had the software and info to help me get both online.