The telephony/iaxmodem port
iaxmodem-1.3.4p0 – a software fax modem that uses an IAX channel (cvsweb github mirror)
Description
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.WWW: https://iaxmodem.sourceforge.net/
Maintainer
The OpenBSD ports mailing-list