How to fix phone call audio not playing on AirPods Pro?

Re: "phone call audio not playing through airpods pro or other bluetooth headsets"

You may want to direct the call to the AirPods::

See Apple Support's onlin article: While on a call on iPhone - Apple Support

Eg: says:

When you’re on a phone call on iPhone, you can switch the audio to the speaker or a Bluetooth® device.

"Adjust the audio during a call

To change the volume, press the volume buttons on the side of iPhone.

Or swipe down on the call banner, then do any of the following:

• Mute: Tap the Mute button.
• Put the call on hold: Touch and hold the Mute button.
• Talk handsfree: Tap the Audio button, then choose an audio destination."

Else: You can: Route and automatically answer calls on iPhone - Apple Support