Title: dial a telephone number using the Telephony API?
implementation
{$R *.DFM}
function tapiRequestMakeCall(DestAddress, AppName,
CalledParty, Comment: PChar): Longint; stdcall; external 'TAPI32.DLL';
procedure TForm1.Button1Click(Sender: TObject);
var
PhoneNumber, AppName: array[0..255] of Char;
begin
PhoneNumber := '1234567890';
StrPCopy(AppName, Application.Title);
tapiRequestMakeCall(PhoneNumber, AppName, '', '');
end;