I have a company computer to receive fax with internal modem. Since many years now I have the same problem. When I receive some fax, the PC or the modem often freeze and worse of all, it don't hang and stay silent until someone calls back to tell me that it's impossible to send me a fax. The only thing I can do then is to reboot the computer. Here is the hardware history since now: I had a PC with Win98 + USR internal modem working with Symantec Delrina WinFax Pro. Symantec software freeze until complete reboot. I changed for a Dell PC with a Dell internal modem using Windows XP Enterprise Ed. with fax capabilities. PC completely freezes until reset (no reboot possible). Then I changed the internal modem with another USR internal modem. PC doesn't freeze completely but a reboot is necessary. The PC is connected via a powersurge bar with telephone protection. So I don't think it's an overvoltage problem. Could it be some incompatibilities between fax machines that are unefficiently trying to exchange datas? Any sggestions are welcomed Thank you Nicolas Poirier