FaceTime requirements
What you need to make FaceTime calls
To make FaceTime audio and video calls on your Mac, you must:
Be connected to the Internet
Be signed in to FaceTime with your Apple ID
If you don’t have an Apple ID, go to the Apple ID account website to sign up for one for free.
Have a built-in or connected microphone; for FaceTime video calls, you also need a built-in or connected camera
What your friends need to receive your FaceTime calls
The person you’re making a FaceTime video call to must be signed in to FaceTime and have any of the following:
A Mac with FaceTime installed, and a built-in or connected camera and microphone
iPhone 4 or iPod touch (4th generation) with iOS 4.1 or later
iPhone 4S or later
iPad 2 or later
The person you’re making a FaceTime audio call to must be signed in to FaceTime and have any of the following:
A Mac with OS X 10.9.2 or later, and a built-in or connected microphone
An iOS device with iOS 7 or later
What you need to make and receive phone calls on your Mac
To make and receive phone calls on your Mac, make sure of the following:
Your iPhone has iOS 8 or later installed. For more information, see the Apple Support article Update the iOS software on your iPhone, iPad, or iPod touch.
Your Mac and iPhone are on the same Wi-Fi network. For more information, see Connect to the Internet using Wi-Fi.
Your Mac and iPhone are signed in to iCloud and FaceTime using a single Apple ID. For more information, see Set up iCloud on your Mac, Sign in to or out of FaceTime, and the Apple Support article Use Continuity to connect your Mac, iPhone, iPad, iPod touch, and Apple Watch.
Your Mac and iPhone have Wi-Fi calls turned on.
For more information, see Make and receive phone calls on your Mac.