Toshiba Strata CT, Installation & Maintenance Manual

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Computer Telephony Integration
9-8
Strata CT I&M Manual October 2000
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 TAPI32.DLL. (TAPI.DLL on a 16
bit OS) 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 9-10 .
Figure 9-10 The Telephony API model and Strata CT
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.
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