Samsung HM6450 - Manual (Page 26)

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Ending a call
Press the Talk button to end a call.
Rejecting a call*
Press and hold the Talk button to reject a call when a call comes in.
You can also say
“Ignore” when you hear “Call from [Phone number]. Say
Answer or Ignore.”
If you receive calls on both connected devices at the same time you can only
reject the call on the primary phone.
Options available during a call
You can use the following functions during a call.
Adjusting the volume
Press the Volume up or down button to adjust the volume.
You will hear a beep when the volume level of the headset reaches it’s
lowest or highest level.
Muting the microphone
Press and hold the Volume up or down button to turn the microphone off