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After you create a link to a FaceTime call, you can , then click Join.
Let a caller join the FaceTime call
As the originator of the FaceTime link, you can let others in to the call immediately. After a participant with an Apple device has joined the call for 30 seconds, they can also let new callers in.
You know that a new caller is waiting when a badge appears on the Sidebar button 
.
Don’t allow the caller to join the call: Click the Decline Join Request button 
, then click Delete Link.