How to Make FaceTime Audio Calls from Mac to Mac or iOS
The Mac can now make outbound voice calls to other Apple users that have an iPhone, iPad, iPod touch, or another Mac, using nothing but the native FaceTime Audio service. Built into Mac OS X, FaceTime Audio can be used to call any other FaceTime user, free, anywhere in the world, and it provides excellent audio quality for the voice conversation.
Using FaceTime Audio in Mac OS requires MacOS or OS X 10.9.2 or later to be installed on the Mac, both on the caller and recipients end. If calling an iOS device, the iPhone or iPad will need to be running iOS 7.0 or newer to receive the call.
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