User guide

August 2001 3

Reviewing the Key System Components

A PC-based computer telephony system consists of the following

basic components as shown in Figure 1:

One or more computer telephony boards

Firmware on the board

Device drivers

RealCT Direct API (Application Programming Interface)

files

Application source code

During installation, download the firmware to the digital signal

processor (DSP) on the board and load the device drivers. Your

application makes a call to the device driver through the

Brooktrout DirectDM library. In turn, the device driver

communicates with the firmware on the DSP.

Figure 1. Basic Components of a Computer Telephony

System

Brooktrout DirectDM DLL

Application Program

Application

Source Code

Brooktrout DirectDM

Header File and Library

Compiler

Device Drivers

Firmware

Computer Telephony Boards