End current call and answer new call
When a new call rings during a call, press the multifunction
button to answer new call and end current call simultaneously.
On hold current call and answer new call
When a new call rings during a call, double-press the
multifunction button to hold current call and answer new
call. To switch between held call and active call, double-
press the multifunction button.
Switch between the headphone and phone
Press the multifunction button for about 2 seconds to
switch between headphone and phone during a call.
Mute on/off
Press the volume button "-" for about 2 seconds to mute
on/off.
Voice dial (phone feature)
Press the volume button "+" and "-" for about 2 seconds