We just open sourced GOfax.IP, a project i've been working on for the better part of the last two months.
It's a new (and I think best yet) way to bring "native" Fax over IP using T.38 or G711 to HylaFAX Fax servers by directly connecting HylaFAX to FreeSWITCH's mod_spandsp without any modem emulation layer.
We replaced the faxgetty and faxsend processes with versions that use FreeSWITCH to handle incoming and outgoing calls.
We wanted to have a solution that brings all the power of rxfax/tfax to HylaFax. FreeSWITCH's modem emulation has to be chained to t38_gateway to use T.38, and in my tests that didn't work as well as using txfax/rxfax, so I looked at how capi4hylafax hooks into HylaFax and implemented that approach for FreeSWITCH.
I'd love to hear thoughts/suggestions and am happy to accept bug reports and contributions.
Regards,