Audio doesn't route via bluetooth headset - android java

[abdurdp]

Describe the bug
A clear and concise description of what the bug is.
After joining the call user cant hear with Bluetooth head set.

Expected behavior
user should hear with Bluetooth head set after joining call.

[plutoless]

1. please ensure you have all your needed permission in android manifest file
2. please ensure your bluetooth head set support SCO protocol. You may call AudioManmager.isBluetoothScoAvailableOffCall to tell if it supports SCO protocol or not.