Your device is causing poor audio quality

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Lync 2010 More...Less

Lync 2010 handles a wide range of devices while still maintaining high quality audio and video. However, certain devices may cause echo in the call. To reduce echo for a problematic device, Lync triggers a voice switching mode, which limits the ability for talkers to speak at the same time.

Make sure that the device you are using is optimized for Lync 2010. For a list of optimized devices, see Phones and Devices for Microsoft Office Communicator.
In some cases, a third-party driver or software might interfere with Lync 2010. Make sure that your drivers are up-to-date.