If the line is available (not busy) and the connection is established, the
data can be sent. The application accomplishes this by giving control back to the
user, who, using a dialog box, specifies the file to send and initiates data
transmission. Though TAPI functions continue to manage the opened line and the
call in progress, actual transmission is started and controlled by non-TAPI
functions. In this case, for example, the Comm API of the Win32 SDK could be used to
control the media stream.
If the application were setting up a speech call, its actions would be
similar. Once the call is established, the duty of data transmission is transferred
outside of TAPI to the people who wish to speak, although the line and call
continue to be monitored by the application using TAPI functions.
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