When on a phone call, the voice of the other party is low or can't be heard

1.  If the following symptoms occur during a hands-free call, updating the headphone software version to 2.1.0 or higher may resolve the issue.

• It is hard for the other party to hear your voice when you whisper.
• The other party hears unpleasant noise when there are loud or irregular background sounds (like a vehicle or train) in your area.

Visit the model page on the Sony Support website and use the Sony | Headphones Connect app to update your headphones.

For your reference, you can make a hands-free call using a smartphone or mobile phone that supports the Bluetooth profile HFP (Hands-free Profile) or HSP (Headset Profile), via a Bluetooth connection.
 

2. If the issue still occurs after updating the software, or if your issue is something other than what is listed above, check the following:

• Make sure both the headphones and the connected device are on
• Turn up the volume of the connected device
• Disconnect then reconnect the Bluetooth device
• Select HFP or HSP for the profile. If your smartphone or mobile phone supports both HFP and HSP, set it to HFP
• When you receive a call while listening to music with the headphones, follow these steps according to your model.
  • For WF-1000XM3:
    Stop the music playback, and then tap the touch sensor twice quickly on the left or right unit to answer the incoming call.
  • For WF-H800 / WF-XB700:
    Stop the music playback, and then press the button on the left or right unit of the headset and receive the call.