Sony WH-CH700N Help Manual page 76

Hint
Some smartphones or mobile phones by default receive calls with the phone instead of the headset. With an HFP or HSP
connection, switch the call device to the headset by holding the
or mobile phone.
Volume for a call can be adjusted during a telephone conversation only.
Volume during a call and volume during music playback can be adjusted independently. Changing the call volume does not
change the volume of music playback, and vice versa.
Note
Depending on the smartphone or mobile phone, playback may not resume automatically even if you finish the call.
Use a smartphone or mobile phone at least 50 cm away from the headset. Noise may result if the headset and the smartphone or
mobile phone are too close.
Related Topic
How to make a wireless connection to Bluetooth devices
Making a call
Functions for a phone call
What you can do with "Sony | Headphones Connect" app
button down for about 2 seconds or by using your smartphone
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