[Cabanyaler]

Ja està, sol cal ficar-li el temporizador, però aquestes son les funcions principals.

Código Delphi [-]
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
  function tapiRequestMakeCall(lpszDestAddress,lpszAppName,lpszCalledParty,lpszComment: LPCSTR): DWORD;
  stdcall;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
  function tapiRequestMakeCall; external 'TAPI32.DLL' name 'tapiRequestMakeCall';

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
     PhoneNumber: array [0..255] of char;
     AQuien: array [0..255] of char;
begin
     StrPCopy(PhoneNumber,'963134455');
     StrPCopy(AQuien,'To me');
     tapiRequestMakeCall(PhoneNumber,'',AQuien,'');
end;

end.