The TAPICLIENT_LineSetCallPrivilege function is called during a call to the lineSetCallPrivilege function.
LONG TAPICLIENT_LineSetCallPrivilege(
HMANAGEMENTCLIENT hmClient,
LPTAPIPERMANENTID lpPermanentID,
DWORD dwCallPrivilege
);
lineSetCallPrivilege, TAPICLIENT_ClientInitialize, TAPIPERMANENTID