[OpenSIPS-Users] YNT: Re: YNT: Re: YNT: Re: RFC3261 transaction matching failed error for the second 401 Unauthorized - Challenging the UE

[Bogdan-Andrei Iancu]

Hi Kaan,

I'm glad the first part is properly working now.

Your ACK (as it is for a 200 OK) should be routed based on Route headers 
(record route  and loose route mechanism). TO better understand this, 
please take a look to this webinar:
     http://www.opensips.org/Documentation/Webinars#toc12   ( chapter 5.5 )

At INVITE time you should do record_route() and the ACK should carry the 
Route headers in order to follow the same path as the INVITE.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 15.10.2014 07:27, Kaan Dandin wrote:
> Hi Bogdan,
> Thanks a lot for your response. My aim is to register to both IMS 
> nodes(.3 and .5) in the same time ,then able to make load balancing to 
> any of them.
> With your support ,now I better understand how t_relay and paralel 
> forking is working.
> I have managed the problem by sending to different IMS registration 
> scenario (.3 and .5) from IMS bench (.11) instead of parallel forking 
> in OpenSIPS.
> Now the registrations are successuly completed.
> But I have another problem in the IMS call scenario.
> ACK messages are always going to .5 IMS node in t_relay instead of the 
> related node. In the logs it seems that related transaction not found 
> and address is found with DNS lookup and always sent to .5 node.
> For that reason only half of the calls are successful.
> Below I am sharing related part of the script , call flow and trace.
> Kind regards,
> Kaan
> } else {
>                         if ( is_method("ACK") ) {
>                                 xlog("xlog_ack_method");
>                                 if ( t_check_trans() ) {
>
>                                  # non loose-route, but stateful ACK; 
> must be an ACK after
>                                         # a 487 or e.g. 404 from 
> upstream server
> xlog("xlog_nonlooseroutestatefulack");
>                                         t_relay();
>                                         exit;
>                                 } else {
>                                         # ACK without matching 
> transaction ->
>                                         # ignore and discard
>                                         t_relay();
> xlog("xlog_nonlooseroutenonstatefulack");
>                                         exit;
>                                 }
>                         }
>

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