Sony WI-C600N Help Manual page 121

Help Guide
Wireless Noise Canceling Stereo Headset
WI-C600N
Cannot hear a person on a call.
Check that both the headset and the connected device (i.e., smartphone) are turned on.
Turn up the volume of the connected device and the volume of the headset if they are too low.
Check the audio settings of the Bluetooth device to make sure the sound comes from the headset during a call.
Use the Bluetooth device to reestablish the connection. Select HFP or HSP for the profile.
While listening to music with the headset, stop playback and press the
Related Topic
How to make a wireless connection to Bluetooth devices
Receiving a call
Making a call
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button to respond to an incoming call.