How to send DTMF without the beeps

I know it's possible... but how can I send DTMF digits after the call answers without the tones being audible?

Windows Mobile 5 or 6

Is there an API call for this?
LVL 30
Mike LazarusAct! Evangelist - CRM ConsultantAsked:
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Mike LazarusConnect With a Mentor Act! Evangelist - CRM ConsultantAuthor Commented:
Just a thought... if you have any ideas on this:
http://msdn.microsoft.com/en-us/library/bb416506.aspx
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Peter HartCommented:
I don't think so.   the DTMF (Dual-tone multi-frequency) are audible  - do you mean send other commands but not using DTMF ?
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Mike LazarusAct! Evangelist - CRM ConsultantAuthor Commented:
I know it can be done. I have an app (Handheld Contact - ACT! of WinMob) that dials a number:
           xxxxxxxxxx
Then, sends the DTMF string:
          *#xxxxxxxxx

The 2nd part was audible, but the developer made a change and suppressed it
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Peter HartConnect With a Mentor Commented:
this may be sometihng close to what you want, I haven't tried it.
 NULL value for lpszDigits aborts any digit generation currently in progress

http://msdn.microsoft.com/en-us/library/ms894152.aspx
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Mike LazarusAct! Evangelist - CRM ConsultantAuthor Commented:
Ta... I'll get my code monkey to give it a try :-)
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