[SR-Users] event_route tm:branch-failure and onreply_route shared variables

[Володимир Іванець]

Hello,

I'll try to break down my scenario as detailed as I can :)

Following happens when Kamailio receives INVITE from Asterisk:
1. It decides if Asterisk reaches out to registered UAC.
2. *lookup("location")* is executed. AoR can have multiple Contacts.
3. Processing reaches branch_route[MANAGE_BRANCH]. String with
rtpengine_offer parameters is being formed here. It can have different
settings based on each Contact. *rtpengine_offer* is called.
4. Some phones will respond with 415 or 488. These responces are processed
in event_route[tm:branch-failure:FAILURE].
5. Alternative rtpengine_offer parameters are compiled. This time *call-id* is
set to value from *Call-ID* plus a *suffix*. This information is stored in
Htable. *rtpengine_offer* is called.
6. *$du* is set from apropriate Contact's data from
*reg_fetch_contacts("location",
"$ru", "callee")* and *t_relay()* is called.
7. Responce 200 for this branch will be processed in *onreply_route[REPLY]*.
rtpengine_answer parameters are formed including *call-id* and
*rtpengine_answer* is executed.

The problem is that that I was not able to rely responce on step 7 to new
request from steps 4-6. I figured that *$(ulc(callee=>addr)[$var(i)])* in
*event_route[tm:branch-failure:FAILURE]* will be the same as *$T(ruid)* in
*t_on_reply("REPLY").* At this point I need to perform comparison of
*$T(ruid)* to saved values from Htable.

These values have few dozens of characters and operation of comparison does
not look to be efficient.

It also looks like *$T_branch(uri)* variable (which could be perfect to use
on step 7) is not available in responce to new branch because how I set
*$du* and called *t_relay()*. I was trying to call *lookup("location")*
 before *t_relay()* and *$T_branch(uri)* would be available but since each
AoR can have multiple Contacts this will not work.

Please let me know if I need to provide any clarifications. I will really
appreciate any suggestions on improvements that cam be made here.

Thanks a lot!

пн, 18 бер. 2019 о 22:51 Alex Balashov <abalashov at evaristesys.com> пише:

> On Mon, Mar 18, 2019 at 12:43:25PM +0200, Володимир Іванець wrote:
>
> > I found much better description of the problem here
> > https://lists.kamailio.org/pipermail/users/2008-August/019070.html.
>
> Wow. That is some rather ancient history. And I think reflects a
> different place in the evolution of my own understanding of
> Kamailio/OpenSER; it was 11 years ago. I don't know if the question is
> very pertinent today as formulated there.
>
> --
> Alex Balashov | Principal | Evariste Systems LLC
>
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>
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