[Serusers] About the failure route problem

[AR.]

Hi all
    I have a problme about the failure route
    
    My scenario is that:
    If voice gateway 1 is busy then forward the call to the voice gateway 2

   My config is :
   route[5] {
      rewritehostport("voice_gateway_1:5060");
      forward(uri:host, uri:port);
      t_on_failure("2");
      if(isflagset(1))
         append_branch();
      setflag(1);
      t_relay();
      break;
}
 failure_route[2] {
        route(6);
}
route[6] {
      rewritehostport("voice_gateway_2:5060");
      forward(uri:host, uri:port);
      break;
}

 But it still doesn't work
 anyone help?

Best Regards
AR.
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