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DTMF Generate/Detect
Demo (UPD) --- Sample
code in VB6 or Delphi
This sample demonstrates how to generate/detect DTMF and
Gather digits using GatherDigits() or GatherDigitsEx().
Note:
GatherDigits()-- very usefully function.
It implements in the hardware level. It is device-dependent
and it only supports in a few voice boards. It will NOT
work in the common modem devices.
GatherDigitsEx() method implement in our
control, the same as GatherDigits() but
device-independent. It will work in all the devices which
support DTMF detection.
Requirement:
- GatherDigitsEx() need TAPIEx version
2.9.8.x or higher
- Voice modem, voice board or other telephony devices
that supports DTMF
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Telephony
Programming Controls 
