Express Talk VoIP Softphone for Mac 4.04
Express Talk is software that works like a telephone to let you make calls on your Mac OS X.
With Express Talk you can call anyone on the internet who has installed Express Talk (or any other SIP voip softphone). Calls are free. You can also call ordinary telephone numbers anywhere in the world if you sign up to a gateway service. It uses the SIP protocol and is compatible with most major VoIP SIP service providers.