[newbie] Modem Problems

[sinx]

I just installed Madrake 6.0, running KDE, I used kdeppp and tried to setup my modem, which is a U.S. Robotics 56k Internal Fax Modem, on COM3, but I couldn't seem to set it up right, I always got errors like "modem is busy" or "can't open modem" Does anyone know what settings I should use for the modem? Or if I have to download some linux drivers for it? Thanks.