asterisk users - Mar 2017 - Asterisk/FFA version upgrade recommendation

Hi all,

I'm needing to upgrade Asterisk from 10.x to whatever the recommended
version
is that will allow me to continue to use Fax For Asterisk.

I don't have many upgrade windows, I'd like to get the most bang for my
buck,
but I can't afford to be a beta tester on this server.

The FFA site says that it's supported by Asterisk version 12 and lower, but 
version 12 doesn't seem to be supported.  Perhaps my information is 
outdated....?

Anyway, I can't go with the spandsp route because my system listens for AMA 
events that spandsp doesn't seem to produce and I can't emulate easily.

Any recommendations would be very welcome.

-- 
Mike Diehl