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Cocoa Iax Ping
Open source Mac app that will help you test your firewall against a Asterisk server...
Mirial Softphone
Professional HD and SD video conferencing on Windows and Mac...
Express Talk VoIP Softphone
Express Talk is a free VoIP SIP based softphone for Mac OS X....
Express Talk Free VoIP Softphone for Mac
Internet phone to make calls on your Mac OS X...