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You use a device that has a dial pad and display on a computer that has Microsoft Office Communicator 2007 installed. You enter a telephone number in the dial pad of the device, and you then dial the number. However, when you enter the telephone number, you do not hear the Dual Tone Multi-Frequency (DTMF) tones for the number keys when you use the device dial pad on the computer.
To resolve this issue, install the update that is described in the following Microsoft Knowledge Base article:
943083 Description of the update for Communicator 2007: December 17, 2007
Microsoft has confirmed that this is a problem in Microsoft Office Communicator 2007.