Anyone know of any fax software/solution that will allow Filemaker to fax over a large number of lines? I'm looking to create a solution to automate up to 4,000 faxes to be sent and want to do it over at least 20 lines.

I'm guessing you are on a Windows platform. I've setup 4Sight Fax on the Mac platform with a 4 line setup. It will support as many lines as you can stuff 4 port serial cards in the box (that would be 24 lines for an old 9500-9600). I think Soft Solutions (which bought the 4-Sight product) now supports Windows as a client (don't know if you can use a windows server).

We've use 4-Sight together with a Applet connector for a client that sends about 600 faxes (2000 pages) a day. The server runs under OS 8.1 on an old 8500/120 and it works great, goes months without any hands-on. Price was about $6,000, a little pricey, but very reliable.

Take a look at www.4sightfax.com.

-bd