Talking Dialpad with this application when you press on ur dialpad to dial a number and hold a key for instance 1-9 including * and # that the phone will actually say the number out loud and also when you have a call waiting it could play an mp3 in your own ear instead of beeping. It basically just adds keys to the registry to play an mp3 when u press and hold a key.
The keys that needs modification are
HKCU\ControlPanel\Sounds\Dtmf#
HKCU\ControlPanel\Sounds\Dtmf*
HKCU\ControlPanel\Sounds\Dtmf0
…..
…..
HKCU\ControlPanel\Sounds\Dtmf9
will have to change the key for each of them
“Sound” (string) = %CE19%\Sounds\1.wav
the sounds should be in .wav/.mp3 format and should be placed in
\Application Data\Sounds
Please make a backup of the Registry before you make these changes or install the .cab file posted here, so if any thing goes wrong you can restore the Registry Keys.
Source : 
xda-developers.com
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