head telephone
4.This paper deals with a construction of a visual component for telephone application programming interface (TAPI) in a visual software designing kit (SDK),Delphi,which is one of the most adaptable to development of an application for monitoring system. By means of the adaptation of the head-file on TAPI (TAPI.H) into the unit-file (TAPI.PAS)adapted to Delphi SDK,exported functions of TAPI's DLL can be called in Delphi.

