Follow the steps below to manage calling with your headset: 

Answer a call: Press the Call button. 
Reject a call: Press and hold the Volume Up or Volume Down button until you hear a tone. 
Make a voice dial call: Press the Call button to activate voice recognition. 
Redial last call: Press and hold the Call button until you hear a tone. 
Mute or unmute a call: Press and hold the Volume Up and Volume Down buttons until you hear “mute on” or “mute off”.
End a call: Press the Call button. Change call volume: Press the Volume Up or Volume Down button. 
To quickly change volume, press and hold the Volume Up or Volume Down button. 
Answer second incoming call: Press the Call button. 
Reject second call: Press and hold the Volume Up or Volume Down button until you hear a tone. 
Note: Some features and phone/network dependent.