[MSDN Library June 1998] Supplementary Telephony Services (50.4320205539718%)

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

[MSDN Library June 1998] Supplementary Phone Services (46.6116412381656%)

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 (46.1855048745293%)

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

[MSDN Library June 1998] Supplementary Telephony Services (43.1149473832401%)

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 > Service Levels

[MSDN Library June 1998] Supplementary Line Functions (42.1077609720902%)

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