[MSDN Library June 1998] Supplementary Phone Services Functions (51.093610462939%)

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

[MSDN Library June 1998] Supplementary Line Services Functions (49.0488024970784%)

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

[MSDN Library June 1998] Supplementary Telephony Services Reference (42.2276956759715%)

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

[MSDN Library June 1998] Supplementary Line Functions (32.3023787334132%)

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

[MSDN Library June 1998] Supplementary Phone Services (32.1509933578899%)

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