[MSDN Library June 1998] Supplementary Telephony Services Reference (79.5795795795796%)

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 Phone Services Functions (70.6510081510081%)

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 (69.460531960532%)

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 Phone Services (32.0237725410139%)

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 Line Services (30.8332963505377%)

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