When you are wearing either AirPod and a call comes in, Siri can report the call. How to respond to or reject calls is as follows: 1) To reply with AirPods Pro or AirPods, press the power sensor (third generation). 2) Tap an AirPod twice to respond with an AirPod (first or second generation). 3) To reject an incoming call and send it straight to voicemail, double-press the power sensor.