IAXmodem is a software modem written in C that uses an IAX channel (commonly provided by an Asterisk PBX system) instead of a traditional phone line and uses a DSP library instead of DSP hardware chipsets.

IAXmodem was originally conceived to function as a fax modem usable with HylaFAX, and it does that well. However IAXmodem also has been known to function with mgetty+sendfax and efax.

IAXmodem News

Feb 6 2016:Announcing IAXmodem 1.3.0 release
Feb 21 2009:Announcing IAXmodem 1.2.0 release
Jul 19 2008:Announcing IAXmodem 1.1.1 release
Feb 11 2008:Announcing IAXmodem 1.1.0 release
Dec 7 2007:Announcing IAXmodem 1.0.0 release
Oct 11 2007:Announcing IAXmodem 0.3.2 release
Aug 2 2007:Announcing IAXmodem 0.3.1 release
May 15 2007:Announcing IAXmodem 0.3.0 release
Feb 22 2007:Announcing IAXmodem 0.2.1 release
Jan 1 2007:Announcing IAXmodem 0.2.0 release