In the December 2016 timeframe, I started experiencing this issue with my bluetooth headset with no sound during phone calls. At first, a simple restart of my phone solved the issue. Then that stopped working. I thought my bluetooth headset was broken, so I bought a new pair. My new bluetooth headset didn't have audio either so I started exploring online forums. I tried disabling "Okay Google" from any screen and disabled S Voice, and it worked for about a week, then the problem came back again. The most frustrating part of this is that the audio will connect every once in a while and I can use my bluetooth headset for a few calls, but then the issue comes back. I know it's not my headset because I experience the same issue when I connect my phone to my bluetooth speakers through my car.
When I make a call, I hear a beep as the call is initiated, but then there is no sound. If I turn the bluetooth off during the call, I can hear the other person and they can hear me. When I turn the bluetooth back on, I can't hear the other person and they can't hear me. I can listen to music and use "OK Google" with no problem, but the moment I go to make a phone call, the audio does not connect.
Like I said, sometimes it works, but mostly it doesn't and it seems to be random when it does start working. I have not seen any other satisfactory answer on how to solve this issue on any forum other than disable OK Google from any screen. Is there anyone out there who is experience this same frustration and more importantly, does anyone have a solution on how to fix this issue once and for all? I have been patiently searching for a solution, but my patience is running out and I will be purchasing an iPhone soon if I can't find a solution.
Thanks, ~M