Your audio device is causing poor audio quality, try using another audio advice.
If the problem persists, transfer the call to a landline. To transfer a call, in the Lync 2010 conversation window, click the Transfer button, and do one following:
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Click one of your other numbers (such as your mobile phone number).
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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.