[MSDN Library June 1998] Supplementary Phone Services (58.7914023960536%)

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

[MSDN Library June 1998] Supplementary Phone Services (57.9625322997416%)

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

[MSDN Library June 1998] Supplementary Line Services (50.4636994332617%)

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

[MSDN Library June 1998] Supplementary Line Services (50.3436001982514%)

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

[MSDN Library June 1998] Supplementary Line Functions (40.4148990544339%)

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