Are you using freeswitch to send & receive faxes? I've been using it for almost 6 months now and it feels much more robust than asterisk's system.

Hey, we're actually using Asterisk. Out of curiousity, what are you using your fax server for?

we use it to send & receive faxes because we don't want to buy a fax machine :-)

I have a small 50 line ruby script that converts attachments from emails into outgoing faxes, and a 10 line ruby script that converts incoming faxes into emails with a pdf attachment.

You should try freeswitch instead -- the rxfax thing from Asterisk would sometimes truncate incoming faxes. Not sure why.