No audio in phone calls over bluetooth headsets

[happyuser01]

I have a OnePlus 3T. When I connect to it with a bluetooth headset, there is no audio in phone calls in either way.

I can listen to music or videos without issues.

I have searched around on different websites, and unfortunately none of the solutions worked. What I tried (and hasn't worked) so far is:
- Disabling the "Ok, Google" feature (Google Now)
- Disabling Google Assistant entirely
- Disabling Bluetooth scanning in location service
- Force stopping the Bluetooth app
- Deleting the Bluetooth app's data
- Setting the phone to forget the headset and re-pairing again
- Restarting the phone

I have tested with two different headsets from two different manufacturers. Also, the same headsets work fine with other phones. So it is definitely my phone that is causing the issue.

The "phone call" option is checked in the pairing settings for the headset.

Android version: 9 (Oxygen OS 9.0.6)

 

[B. Diddy]

Welcome to Android Central! Interesting -- sounds like the same issue here, but on an S8: https://forums.androidcentral.com/a...s-but-call-audio-doesnt-work.html#post6767150. (Sorry, but we haven't figured out a solution in that thread either.)