[MSDN Library June 1998] Supplementary Line Services Functions (51.0758295241054%)

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 (49.1199262524126%)

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 (41.0372194854953%)

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 (34.1792556102901%)

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 Line Services (31.3868363437329%)

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