Most BT headsets will Idle to save power if not on an active call, then the phone will "Wake" it up when its time to work, some headsets are a little more difficult to wake up and I've noticed on a few headsets you'll have to press the send/end button to make it realize there is an incoming call. But if it is connected I havent seen a headest that doesn't play the ringtone over the headset itself.
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