[MSDN Library June 1998] Phone Device (41.9194177915108%)

MSDN Library Visual Studio 6.0 > Platform SDK > Networking and Distributed Services > Telephony Application Programming Interface (TAPI) > TSPI Version 2.1 > Overviews > The Telephony Model > Device Classes

[MSDN Library June 1998] Phone Devices (39.2914023960536%)

MSDN Library Visual Studio 6.0 > Platform SDK > Networking and Distributed Services > Telephony Application Programming Interface (TAPI) > TSPI Version 2.1 > Overviews

[MSDN Library June 1998] Phone Buttons (36.5499810267252%)

MSDN Library Visual Studio 6.0 > Platform SDK > Networking and Distributed Services > Telephony Application Programming Interface (TAPI) > TAPI Version 2.1 > Overviews > Phone Devices Overview

[MSDN Library June 1998] Phone Device Class (36.3716232088325%)

MSDN Library Visual Studio 6.0 > Specifications > Platforms > Telephony Application Programming Interface (TAPI) > Chapter 3

[MSDN Library June 1998] Phone Device Messages (33.737289841941%)

MSDN Library Visual Studio 6.0 > Platform SDK > Networking and Distributed Services > Telephony Application Programming Interface (TAPI) > TAPI Version 2.1 > TAPI Reference > TAPI Messages