Why your Bluetooth headphones sound so much worse on calls (and how to fix it)

If you have noticed that your Bluetooth headphones' audio quality degrades when on a call, you're not alone. Here's how to ...
Ars Technica

What is the true state of using Bluetooth in desktop OSes for calls?

So I use Linux, with distributions which are not particularly known for their multimedia focus (EL8/EL9). With EL8, I discovered that USB Bluetooth audio adapters solved nearly perfectly all problems ...