[OpenSIPS-Users] Need to understand the seral forking logic of opensips .

Ben Newlin Ben.Newlin at genesys.com
Mon Oct 9 14:07:58 UTC 2023


I think the relevant piece here is not the call to “serialize_branches”, but how the branches are being created to begin with. Are you using drouting, dispatcher, registrar, etc? It seems like what is happening is that whatever mechanism you are using to track the contacts is considering the 486 response to mean that URI should not be tried again and it is removed from routing. This behavior is likely configurable in that module.

Ben Newlin

From: Users <users-bounces at lists.opensips.org> on behalf of Sasmita Panda <spanda at 3clogic.com>
Date: Monday, October 9, 2023 at 8:47 AM
To: OpenSIPS users mailling list <users at lists.opensips.org>
Subject: [OpenSIPS-Users] Need to understand the seral forking logic of opensips .
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Hi ,

I know this is a very basic question . Still I need some clarification .

I have 2 contact for same number , When I place a call Openips give that to 1st if 1st contact reject the call with 486 busy , then opensips try the same call to the 2nd contact without rejecting the call .

In the next call for same number , opensips tries to 2nd contact if that rejects the call with 486 it wont try to the 1st contact again . Why is this happening ?


                        if (!serialize_branches(1)){
                                sl_send_reply("500","Unable to load contacts");
                                if (next_branches()){

failure_route[1] {

   if ( t_check_status("404|477|480|481|408|486|50[234]")){
         if (next_branches())


This is in my config file . i have gone through the doc  https://www.opensips.org/Documentation/Script-CoreFunctions-1-11#toc44<https://www.opensips.org/Documentation/Script-CoreFunctions-1-11#toc44>
but not able to understand properly .

How can I print the internally stored branches on avp ?

Thanks & Regards
Sasmita Panda
Senior Network Testing and Software Engineer
3CLogic , ph:07827611765
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