Sony MDR-1000X 사용자 매뉴얼

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 your finger to the touch sensor until the device is switched or by using your smartphone or mobile phone.

If you adjust the volume on the headset when not talking, the music playback volume is adjusted.

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.