Package request: t38modem
From your application view point it’s a fax/voice modem pool.
From IP network view point it’s a H.323/SIP endpoint with T.38 fax
support.
From your view point it’s a gateway between an application and IP
network. Works with HylaFAX.
http://t38modem.sourceforge.net
(from redmine: issue id 1753, created on 2013-04-02)