And that is that your NT server may have locked up for some reason. It didn't happen to us. The fax software locked up but NT ran fine. That means another phone line or extension, of course. Put several fax boards in both servers.
Load sharing makes troubleshooting easier, too.
Be prepared to grow. As soon as our Pennsylvania office heard about our new FaxFacts system, they started sending us their jobs, though they have their own fax blaster. Luckily, Copia's FaxFacts could handle the additional board with virtually no alteration. All we did was add eight lines of text to a .CFG file and we had the additional four lines ready to fax. Boards make a real difference.