True, especially if it’s oriented at a consumer and not commercial.

Edge AI inference is very valuable, just not in this context.

If I’m using Bluetooth earbuds I can receive a call from Signal or WhatsApp. So it stands to reason it’s possible a Bluetooth device exists to act like earbuds but for a landline phone. I found a few (cell2jack and XLink BT HD) but could not verify if they’d work for anything other than normal phone calls.