Plantronics Blackwire 435-M - Manual (Page 13)

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Problem Solution
I cannot hear. Ensure that the C435-M is set as the audio device in Microsoft Lync/
Communicator (refer to Microsoft for instructions on changing the audio
output).
Ensure that the C435-M is set as the default listening device in Windows.
Make sure that the volume settings on the headset, Windows and
Lync/Communicator are not turned down.
I cannot be heard. Ensure that the C435-M is set as the audio device in Microsoft Lync/
Communicator (refer to Microsoft for instructions on changing the audio
output).
Ensure that the C435-M is set as the default microphone device in
Windows.
Make sure that the softphone and headset are not muted.
I cannot answer a call with
the headset. Ensure that the C435-M is set as the audio device in Microsoft Lync/
Communicator (refer to Microsoft for instructions on changing the audio
output).
The volume control on the
headset does not adjust
Windows volume. The headset volume is local unless you have installed Plantronics
software. With the software, the headset volume is synchronised to
Windows.
http://www.plantronics.com/businesssoftware
Troubleshooting