CarPlay call continuation on disconnection

Hi, We are developing an infotainment system that includes a wireless CarPlay. Can someone confirm the expected behavior when a device connected via wireless car play should do in the below scenario.

  1. iPhone connected through wireless car play and projection is active
  2. in he CarPlay projection a call is going on.
  3. Car play gets disconnected when user switches off the WiFi.

After these steps , should the call only continue on the phone or should the connected get transitioned to HFP ( Hands free profile) and call continue though the head unit in the car.

Do note, WiFi is switched OFF in phone so CarPlay can't restart without user switching it back ON