Have you done any performance testing? How many concurrent faxes can you do?
Yes, in Lua you can do transfer to FAX_DETECT extension. It's fairly simple. If you choose to go that route, I can help you to set it up.
Try api_hangup_hook for post call processing. It gives you whole lots of information. You can also save additional parameters in channel variables and access them there in hangup hook.
No, I haven't done any performance tests. I'm not sure how I would do that either :). I'm pretty new to FreeSWITCH and I've never used LUA before I started this project so all and all.. I'm mostly clueless. There's probably a number of best-practices I just haven't read or learned about yet.
Right now I'm just trying to get it to log everything and be as reliable as possible :) I am curious about how to do the extension transfer stuff in LUA. Everything I learn at this point is a big bonus to making this work best.
Right now all the post call processing is just happening in the same LUA script. I do call "hangup" after the fax is received though. Is there a big advantage to splitting the script up into two scripts? One for the call and another for post call stuff (logging, emailing, etc). ?