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Q3100070: When I open a port, I get the following error: 30203 ("TAPI Device Manager failed to respond"). What does it mean?

The Windows Telephony device name is valid,. There can be two reasons for this error:

  • The Windows Telephony device is already in use by another application;
  • The port speed is wrong; Windows is able to open the port, but is not able to initialize the device properly because of the wrong speed. Make sure that the port speed of the device and the port settings of the Telephony device in the Control Panel both match.
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