Example Illustrating the Programming Model
Consider a Win32-based application that can make either voice or data (modem)
calls. Although these calls could be made simultaneously if a telephone line
were in place for each device (the telephone and the modem), assume that there is
only one line, so calls are placed one at a time.
For this discussion, a line is defined as a physical telephone line leading
from the wall to the telephone company's switch, and a line device (such as a fax
or modem) is a local device on the telephone line. Also, this example is
restricted to POTS; the telephone line is a standard, two-wire twisted-pair cable
that carries an analog signal and constitutes a single channel.
The line devices attached to the computer are visible to the application as
instances of the line device class, which is defined by TAPI. The physical
telephone is visible to the application as an instance of the phone device class.
This application therefore must be able to execute two types of calls: voice and
data. One strength of the TAPI programming model is the way its abstraction into
classes exploits the similarities between these different types of calls.
For a more in-depth discussion of this process and related ones, see TAPI Applications
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