Announce and answer calls
You can use the Announce calls option to announce incoming calls through your headphones and answer them using voice control.
The option Announce calls is supported with the following headphones:
*AirPods Max
*AirPods Pro
*AirPods (2. Generation)
*Powerbeats Pro
To have calls announced and answered 
1 On your homescreen, tap .
2 Tap Siri & Search| Announce Calls.
3 Select the desired option:
*Always
*Headphones and car
*Headphones only.
If your iPhone is connected to headphones that support this option and a call comes in for you, Siri recognizes the party and asks if you want to answer it.
4 Say "Yes" to accept the call or "No" to reject the call.
*You are connected to the subscriber or the call is rejected.