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dtmf detection problem after closing wave device.

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hello friends
I am writing an IVR application in which I have to detect the dtmf using linemonitordigits api. it works fine but when if call the waveoutunprepareheader and waveoutclose functions it stops giving me dtmf signals however if I do not call the above function it sends the dtmf however it is then unable to play the file.

other sample applications works file
win98SE,TAPI 2.1,vc++ 6.0 SP4

 
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