Your computer is running slow and it is causing poor audio quality. You may 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 current.
Also, make sure the device you are using is optimized for Lync 2010. For a list of optimized devices, see Phones and Devices for Microsoft Office Communicator.
Click one of your other numbers (such as your mobile phone number).
Click Another Person or Number, and then in the dialog box that is displayed, type the phone number you want to transfer the call to, and then click OK.