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Using Your Headset
Headset setup
Microsoft Windows Your headset may NOT be set as the default device for Microsoft
Windows sounds and audio. To change this in Microsoft Windows, refer to Control
Panel>Sounds and Audio Devices.
Microsoft Office Communicator Your headset may NOT be set up in Microsoft Office
Communicator as the default for speakerphone or system sounds. If you wish to change the
audio setup in Microsoft Office Communicator, refer to the Microsoft user guide.
For compatibility with additional UC applications, download Plantronics software at
plantronics.com/software.
Answering/Ending/Making Calls with Microsoft Office Communicator
To make a call, select a contact or dial the number via Microsoft Office Communicator.
To answer or end a call, simply press the call answer end button.
Adjusting Volume
To increase listening volume, press the upper end (+) of the volume button. To decrease
listening volume, press the lower end (–).
To adjust the listen or speak volume of the Microsoft Office Communicator,
please refer to the softphone user documentation.
To adjust the speak volume of the audio device on the computer, use the Sound
and Audio Device section on the Control Panel. It is recommended that the volume is
adjusted on the inline control and not the Windows volume control.
Muting a Call
To mute the microphone during a call, briefly press the mute button. When muted, the
Mute LED will be lit.
To unmute press the button again.
Problem Solution
I cannot hear caller. • The USB headset is not set as the
default audio device. To change audio
setup, refer to the Microsoft Office
Communicator user guide.
• Listening volume is too low. Press the
volume up button on the headset.
Callers cannot hear me. • Headset is muted. Press the mute
button on headset to unmute the
microphone.
• Headset microphone boom aligned
incorrectly. Align the headset boom with
your mouth.
• The USB headset is not set as the
default Voice device. Use the Voice
settings in Windows under Sounds
and Audio Devices to select “Blackwire
C420-M” as the voice device.
Sound in headset is distorted.
I can hear echo in headset.
• Lower the listen volume on your
softphone until the distortion disappears.
• Adjust volume on headset.
The other headset I was using to
listen to music does not work any
more.
• Use the Audio settings in Windows
under Sounds and Audio Devices to
change the device used for audio.
My headset stops responding
to button presses.
• When a PC goes into standby or
hibernation, the USB headset no longer
is powered on. Be sure your PC is in an
active state.
Putting a call on hold
If your softphone supports this feature, holding down the answer/end button for 2 seconds
will place the call on hold. Refer to your softphone’s user guide for additional features
available while on hold. Pressing the answer/end button again will take the call off hold.
Troubleshooting
