FaceTime for Mac (Yosemite): Block calls
You can block all calls by turning FaceTime off or by signing out of FaceTime. If you turn FaceTime off, you can turn it on again without having to sign in. You can also block individual callers.
By turning on Do Not Disturb, you can block all calls, messages, and other notifications during a specific time period or when you’re mirroring to a TV or projector. This prevents notifications from waking you up or interrupting a presentation.
When someone calls you while you’re blocking calls, you’re not notified, and to the caller, it looks like you’re not answering the call.
If you’re blocking individual callers, you can still call them without unblocking them.
To block all calls, do one of the following:
-
Turn FaceTime off: Choose FaceTime > Turn FaceTime Off.
To receive calls again, choose FaceTime > Turn FaceTime On.
-
Sign out: Choose FaceTime > Preferences, then click Sign Out.
To receive calls again, sign back in.
To block all FaceTime calls on your iOS devices, turn FaceTime off or sign out of FaceTime on each device. (People who are on your blocked list are also blocked on all of your devices signed in to FaceTime with the same Apple ID.)
To block an individual caller, choose FaceTime > Preferences, click Blocked, click Add 
, then select a name in the list.
To unblock someone, select a name, then click Remove 
.