Although modems have been around for a long time, unsupported modems and modem with improper configurations can cause them to underperform or just flat-out fail. Add the fact that many common modems (referred to as winmodems) either don't work in Linux at all or need special drivers, and just getting a modem to work can be difficult.
Once you have a working modem, the next trick is to get it to communicate by dialing out to the service provider. This chapter describes how to get a modem working in Fedora, and then troubleshoot your dial-up connection to the Internet.
Because dealing with winmodems is one of the most common issues related to modem problems in Linux, refer to the "Using winmodems" sidebar to see descriptions of winmodems and linmodems.