The TAPICLIENT_LineAddToConference function is called during a call to the lineAddToConference function.
LONG TAPICLIENT_LineAddToConference(
HMANAGEMENTCLIENT hmClient,
LPTAPIPERMANENTID lpPermanentID,
LPLINECALLINFO const lpConsultCallCallInfo
);
The lpConsultCallCallInfo parameter is passed in to give the TAPI Client Management DLL information about the call being added to the conference.
lineAddToConference, TAPICLIENT_ClientInitialize, TAPIPERMANENTID