# -------------------------------------------
  # - Loose Route Section  
  # -------------------------------------------
  if (loose_route()) {
    if ((method=="INVITE" || method=="REFER") && !has_totag()) {
      sl_send_reply("403", "Forbidden");
      exit;
  };

  if (method=="INVITE") {
    if (!allow_trusted()) {
      if (!proxy_authorize("", "subscriber")) {
        proxy_challenge("", "0");
        exit;
      } else if (!check_from()) {
        sl_send_reply("403", "Use From=ID");
        exit;
      }; 
        force_rtp_proxy();      
      consume_credentials();
    };            

    if (nat_uac_test("19")) {
      setflag(6);
     }; 
    };
    route(4); 
    route(1);
    exit;
  };