[Serusers] Forwarding - why append_branch() ?

[benaudi at gmx.de]

Hello,

perhaps somebody can explain for me why first example works without
append_branch() and second example NEED append_branch() to work?

In 1. example i rewrite Request-URI in main-route-block. SER calls the new
URI successfully. If i make append_branch() here, SER craches.

In 2. example i rewrite Request-URI in failure-block. If i do not make
append_branch() here, SER does not call the new URI. With append_branch()
everything is all right, SER calls successfully the new URI.



1. example
-------------------------
modparam("tm", "fr_inv_timer", 10)	# set fr_inv_timer to 10 seconds
...
route{
  ...
  if (lookup("location"))
  {
    ...
    route(1);
    break;
  }
  else if (method == "INVITE" )
  {
    revert_uri();
    avp_db_load("$ruri","s:redirect_number01");
    t_on_failure("2");
    attr2uri("redirect_number01");
    t_relay();
    break;
  }
}
-------------------------





2. example (same ser.cfg)
-------------------------
failure_route[1]  # entered when fr_inv_timer hits, 408 Timeout
{
    revert_uri();
    avp_db_load("$ruri","s:redirect_number01");
    t_on_failure("2");
    attr2uri("redirect_number01");
    append_branch();  # why necessary?
    t_relay();
    break;
  }
}
-------------------------


Alex

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