Change the Mac Ringtone Sound for Incoming iPhone & FaceTime Calls
Now that the Continuity feature allows the Mac to receive incoming calls from your associated iPhone, in addition to standard FaceTime video and audio chat, you may want to take a moment to customize the ringtone that sounds when a call is coming to a particular Mac. This is particularly helpful with multiple-Mac environments with different users, or even with multiple Macs and iOS devices using the same ID that may ring at the same time, since it will differentiate each machine.