No voice from callers
- Check that both the headset and the connected device (i.e., smartphone) are turned on.
- Turn up the volume of the connected device (i.e., smartphone).
- Check that output of the BLUETOOTH device is set for the headset.
- Select an HFP or HSP BLUETOOTH connection by operating the BLUETOOTH device.
- If you are listening to music using the headset, stop playback, press the button on the left or right unit and talk.