Sony WI-C600N Help Manual page 89

Hint
Some smartphones or mobile phones receive calls with the phone instead of the headset by default. With an HFP or HSP
connection, switch the call to the headset by holding the
phone.
Volume for a call can be adjusted during a telephone conversation only.
The headset volume during a call and during music playback can be independently adjusted. 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 smartphone or mobile phone
are too close to the headset.
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 for about 2 seconds or by using your smartphone or mobile
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