[SR-Users] Final reply code is wrong in case of 302 and 486 busy

[Marco Capetta]

Hello,

we have a problem of final reply code in case of 302 and then 486 busy.


This is our scenario:

A, B and C are subscribers.

A ----------> Kamailio ----------> B
               Kamailio <---302---- B
               Kamailio -----------------------> C
               Kamailio <---486----------------- C
A <---302---- Kamailio

Expected behavior: Kamailio should reply to A with 486, as C was busy, 
and not 302.



We have kamailio v5.1.4

In the call to B we set both failure and branch_failure:
     t_on_failure("failure_route");
     t_on_branch_failure("failure_redirect");

in order to handle the 302 redirect per branch with:
     event_route[tm:branch-failure:failure_redirect]
     {
         if($T_reply_code == 301 || $T_reply_code == 302)
         {
             do redirect ...
         }
     }

and the final failure with:
     failure_route[FAILURE_ROUTE_LOCAL]
     {
do something ...
     }

Since we have 'modparam("tm", "failure_reply_mode", 3)' my expectation 
is to get the winning reply from the branch of last step.



Is there any configuration I'm missing?
Since we manage the redirect with a branch-failure, is the winning reply 
calculated in a different way?


Thanks
Marco