IaxComm is an Open Source VOIP softphone that operates on the iax protocol.
One of the most convenient features of iaxComm is that it has been developed with an open source license, meaning that you can access and modify the source code as you see fit. If you want to look under the hood and fine-tune things for your specific purposes, then this is definitely a selling point.
Those who are interested in iaxComm can navigate to the simpleclient/iaxcomm subdirectory, which is contained within the iaxclient source code. And if you're having trouble getting started, there are plenty of resources available online to help you out. In terms of convenience and accessibility, iaxComm is definitely worth considering if you're in need of a reliable softphone.
Version 1.2.0: N/A