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Change FaceTime ringtones on Mac
You can set a default ringtone for all incoming FaceTime calls on your Mac.
In the FaceTime app
on your Mac, make sure you’re signed in, choose FaceTime > Settings, then click General.
Click the Ringtone pop-up menu, then choose a new ringtone.
When you select a new ringtone or text tone, a preview of it plays unless your Mac is muted.
To change the ringtone or text tone for a specific caller, edit the caller’s contact card in Contacts. See Update contact information.