Telephony API (Compact 2013)
3/26/2014
The Telephony API implementation is a subset of the Microsoft Telephony Application Programming Interface (TAPI) version 2.0 and some parts of TAPI version 2.1. TAPI provides an application programming interface (API) that simplifies and abstracts the details of making telephony connections between two or more devices. TAPI abstracts call-control functionality to allow different, and seemingly incompatible, communication protocols to expose a common interface to applications through its support of telephony service providers (TSPs).
To add this feature to your OS, see TAPI Catalog Items and Sysgen Variables.
For reference information, see TAPI Reference.