I can't seem to get this modem working with RedHat 7.2 running 2.4.10 kernel on COM1. wvdial recognizes it and tries to dial, but can't get a dial tone. Minicom does not think it is there. I know the IRQ (4) and I/O Address (03F8) are correct. Where do I go from here? Do I need a driver for an external modem?