Comment 3 for bug 1578176

I also experienced this since OTA 9 with my Parrot 9200 bluetooth handsfree, it would pair and connect, provide ringing alert, but no voice on both sides. Also no music streaming from the phone app.

When I go to the Parrot menu under "Bluetooth Audio" and manually choose to connect with the (already paird and connected) phone, all was working well, multiple calls, music, audio and GPS sounds.
So maybe it's not presenting itself as an audio capable bluetooth device anymore in the auto-negotiation?