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[This is preliminary documentation and subject to change.]
Requirement (Designed for Microsoft® Windows® Logo)
If a telephony-centric application is performing extended control functions on a serial device that is also accessible through TAPI (such as a fax application issuing Class 1 or 2 fax AT commands to a fax modem), the application must use LINEBEARERMODE_PASSTHROUGH as defined in TAPI rather than opening the serial device directly. This enables the device to be properly shared with other TAPI applications when not in use.
Your application must not open the serial device directly with the CreateFile function.