Purpose; Introduction - Toshiba Strata DK40 Installation & Maintenance Manual

Computer Telephony Integration
TSPI Description

Purpose

The following technical material can be used by software engineers and programmers
developing third party TAPI applications for use with Toshiba telephone systems.

Introduction

Microsoft "Windows" Telephony is a component of Windows Open Services Architecture.
This architecture provides for the operation of telephony services when connected to many
different telephone switches. Therefore, an application needs to know only the definition of
the API and not its implementation.
The telephony model supplies a DLL component, called TAPI.DLL. this component resides
between the Telephony API called by applications and the Telephony SPI implemented for
the specific switch to which the PC is connected. The software applications call TAPI
functions that are managed by TAPI.DLL and routed to the Service Provider interface (e.g.
Toshiba's DKT SPI) for execution. The relationship between these components is shown in
Figure 8-10.
Strata DKT
2046
Figure 8-10 The Telephony API model and Strata DK
The Telephone Applications Programming Interface (TAPI) was a joint development of
Microsoft and Intel to provide a standard method of connecting Windows based PCs to all
types of telephone systems. The standard allows software developers to create applications
without having to worry about how the telephone network interface functions. This interface
provides three levels of service: Basic, Supplementary and extended Levels of Service.
8-8
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
Microsoft Windows PC
RS-232 Link
RPCI to COM Port
TAPI TAPI
Service DLL
Provider (Windows)
TAPI
Application # 1
TAPI
Application # 2
Strata DK40 I&M Manual Spring 1999
Purpose