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<H1><A NAME="_tapi2_tapi_device_classes"></A>TAPI Device Classes</H1>
<P>A <I>device class</I> is a group of related physical devices or device drivers through which applications send and receive the information or data that makes up a call. Every device class has a <I>device class name</I> that uniquely identifies the class, and provides information about the programming interface and commands that can be used to open and communicate with the devices in the class. </P>
<P>The Telephony Application Programming Interface (TAPI) associates devices from one or more device classes to each line or phone device. You access one of these devices by retrieving the device identifier for the device using the <A HREF="func1_2gf8.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_2gf8.htm"><B>lineGetID</B></A> or <A HREF="func2_1qxw.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_1qxw.htm"><B>phoneGetID</B></A> function. You supply the device class name, and the function returns the specific port name, device name, device handle, or device identifier that you need to open and access the device. The format of the information returned depends on the device class and is described in subsequent topics of this section. </P>
<P class=note><B>Note</B> The device identifier definitions apply to 16-bit and 32-bit TAPI. In some cases, the datatype of a media handle in the device identifier definition may be different from that specified by the Microsoft⌨️ 快捷键说明
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