Lesson 4: Microsoft Windows Telephony

Windows Telephony Architecture

Before you continue with the lesson, run the Chap11.exe animation located on the CD-ROM that accompanies this book. This animation explains how TAPI and TSPI are used to implement telephony support in an application.

In Windows Telephony, an application can call telephony functions to request telephony services. The telephony API accesses the appropriate service provider DLL that communicates with telephony hardware devices such as PBX, Cellular, ISDN, or regular telephone service.

Figure 11.4 How applications use Windows Telephony