iaxComm 1.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The program lies within Internet & Network Tools, more precisely General.
From the developer:
iaxComm is an Open Source softphone for the Asterisk PBX.