IaxComm is an Open Source softphone (VoIP) using the IAX protocol. iaxComm runs under Win32, Linux and Mac OS X (Panther) systems.The source code is in the subdirectory simpleclient / iaxcomm tree iaxclient source code, which is available via SVN. Here are some key features of "iaxcomm": • Support iLBC support speex · · Music on hold. Blind Transfer ·. · Custom Ringtones by CallerID Speakerphone mode ·. · Register with multiple servers (enterprise server and iaxtel IE). · Multiple call appearances. · User selectable audio devices. · User-defined rings. · Autoanswer intercom calls (with password protection). Registration · with an asterisk server prior to dialing is no longer necessary. · Simplified Directory dialogs. · Incoming calls automatically added to the directory.