Your computer is running slow and it is causing poor audio quality. You might have too many applications running at the same time on your computer. Try closing a few unnecessary applications. Also, make sure your computer’s device drivers are up-to-date.
If the problem persists, transfer the call to a regular landline.
To transfer a call, in the Lync conversation window, do one of the following:
Click the Transfer button.
Click Another Person or Number, and then in the dialog box that is displayed, type in the phone number you want to transfer the call to, and then click OK.