When this issue occurs, check the following.
- Check that both the headset and the connected device are turned on.
- Turn up the volume of the connected device.
- Disconnect then reconnect the Bluetooth device.
NOTE: Select HFP or HSP for the profile.
- While listening to music with the headset, when you receive a call, first stop the music playback and then tap the touch sensor twice quickly on the left or right unit to answer the incoming call.