BIS,
I am currently using Hylafax at 4 different locations. Great software using Fedora Core 2 with multiple Zoom external modems. When I first set up I was using USR external modems and had issues with dropped faxes. After a couple weeks of play with setting, I decided to try a driverent external modem and settled on the Zoom. The Zoom modems cleared up all the issues. We receive about 750 pages a day on the Hylafax servers.