Microsoft Telephony Programming Model - Win32 apps | Microsoft Learn
What is TAPI? - Grutzeck Software
Commercial Communications - TAPI Protocol TAPI (Telephony Applications Programming Interface) is a protocol developed by Microsoft for use with its Windows operating system to enable integration between Windows applications and telephony devices.
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TAPI Configuration
Amazon.com: Tadiran FlexSet PEX/APA-F TAPI Interface and Peripheral Expansion Module : Office Products