Problem Solution
I cannot hear caller. • The USB adapter is not set as the
default audio device. Use the Audio
settings in Windows under Sounds and
Audio Devices to select “Plantronics
Blackwire C610-M/C620-M” as the
audio device.
• 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 adapter is not set as the
default voice device. Use the Voice
settings in Windows under Sounds and
Voice Devices to select “Plantronics
Blackwire C610-M/C620-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.
• The USB adapter will set itself as the
default audio device in Windows. 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 adapter no longer
is powered on. Be sure your PC is in an
active state.
To make a call, select a contact or dial the number via Office Communicator.
To answer or end a call, simply press the call answer end button.
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.
During a call, briefly press the mute button to mute the microphone. When muted, the Mute
LED will be lit.
To unmute press the button again.

Adjusting Volume

Muting a Call

USING YOUR HEADSET

Answering/Ending/Making Calls with Microsoft Office Communicator

TROUBLESHOOTING

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