[This is preliminary documentation and subject to change.]
Generates the DTMFs in pDTMFs. Synchronous — returns when the DTMFs have been generated.
Valid DTMFs are '0'-'9', 'A','B','C','D','#','*'.
Use the ITCallTonesNotification interface to monitor for incoming tones.
HRESULT GenerateDTMFs(
BSTR pDTMFs
);
TBD