MS has released a new KB for Office Communicator 2007:
On a computer that has Communicator 2007 installed, you do not hear Dual Tone Multi-Frequency tones when you use a device’s dial pad to enter a telephone number.
See more here: http://support.microsoft.com/default.aspx?scid=kb;en-us;945858&sd=rss&spid=11402
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