Assume that you make a call by using Lync for Mac 2011. In this situation, you cannot use the dual tone multi-frequency (DTMF) functions in the dial pad during the call. Additionally, you may encounter the following issues:
You cannot use mouse to enter digits in the dial pad.
You cannot use keyboard to delete the digits you enter in the dial pad.
To work around the DTMF issue, you must use an external DTMF pad or use another dial pad for Lync to send a DTMF signal.
To resolve these issues, install the following cumulative update:
2909662 Description of the Microsoft Lync for Mac 2011 14.0.7 update
Article ID: 2913468 - Last Review: 12 Dec 2013 - Revision: 1