Your Device Is Causing Poor Audio. This causes timing issues in combination with the Skype for Business audio. You will also see the Call Quality indicator when there is an issue.
Intel provides the USB 30 driver stack. Audio streaming to one ear only. Open the Sound window and select your audio interface in the Playback and Recording tabs.
This causes some confusion with our users such as when a near-end hardwired user on a dedicated high quality network connection sees this pop-up and Im thinking it could be caused by the far end having a poor quality connection not the near end.
This issue occurs because Windows 7 doesnt provide native USB 30 driver support. Your internet connection or your friends is the most likely culprit. If something is red its a significant problem and its likely the main cause of the poor call quality for this session. Make sure that the device you are using is optimized for Lync.