[OpenSER-Users] Why can't I "append_branch()" in FAILURE_ROUTE if reply is 6XX ??

[Iñaki Baz Castillo]

Hi, when I receive a 480 or 603 from a local user I run "on_failure_route" and 
create new branch to forward the INVITE to a media server in which I reply an 
early-media "The number you are calling is not available now...".

It works perfectly if the error is 4XX but it doesn't work if it's a 6XX. I 
get this error:

---------------------
  ## onreply_route[ON_REPLY_TO_USER]:
  603: Decline

  ## failure_route[ON_FAILURE_TO_USER]
  --- TO_MEDIA_SERVER: Destino user_not_available
  May 21 12:25:25 [8502] ERROR:tm:t_forward_nonack: discarding fwd for a
  cancelled/6xx transaction
  May 21 12:25:25 [8502] ERROR:tm:w_t_relay: t_forward_nonack failed
----------------------


My code is very simple:

----------------------
failure_route[ON_FAILURE_TO_USER] {

	if (t_check_status("480|603")) {
		$rU = "user_not_available";
		route(ROUTE_TO_MEDIA_SERVER);
		exit;
	}
}


route[ROUTE_TO_MEDIA_SERVER] {
	rewritehostport("MEDIA_SERVER_IP:MEDIA_SERVER_PORT");
	append_branch();
	t_relay();
}
---------------------



It seems that if the reply is a 6XX then OpenSer can't generate a new_branch 
in failure_route.
  May 21 12:25:25 [8502] ERROR:tm:t_forward_nonack: discarding fwd for a
  cancelled/6xx transaction

Why? doesn't it make sense to forward to some destination even if the negative 
reply is a 4XX or 6XX?

Thanks a lot for any help.



-- 
Iñaki Baz Castillo
ibc at in.ilimit.es