[SR-Users] How to drop 200 OK in onreply_route ?

[Denys Pozniak]

> I do not understand what is difficult, to configure the next hop
application to send 100 trying? Or maybe you can provide a diagram of how
sip traffic is routed on your case.

1) Diagram below is the case I described in the initial email. Here you can
see incoming SIP PUBLISH and 3 forked legs towards Presence Servers.
As soon as Kamailio Proxy receives SIP PUBLISH it sends 200 Ok back.
The Presence Server that has active subscription answers with 200 OK
otherwise 404 Not Found.
So the question was how to drop sending 200 OK (and any other replies) from
Proxy to the left side.

[image: image.png]

2) When I drop 200 OK in *reply_route*, Kamailio Proxy retransmits SIP
PUBLISH to Presence Server.

[image: image.png]

чт, 4 февр. 2021 г. в 14:55, David Villasmil <david.villasmil.work at gmail.com
>:

> I think he’s trying to reply to the client immediately with a 200 and
> consume and not forward the 200 coming from the presence servers.
>
> On Thu, 4 Feb 2021 at 12:43, Daniel-Constantin Mierla <miconda at gmail.com>
> wrote:
>
>>
>> On 04.02.21 12:59, Denys Pozniak wrote:
>>
>> > If you need to stop the retransmission, a 100 trying should be sent
>> instead of 200ok. Can you reconfigure the next hop to do that? Or is it out
>> of your control?
>> Looks it is difficult to do this as Kamailio Proxy forks via
>> append_branch() incoming SIP PUBLISH to all Presence Servers.
>>
>>
>> I do not understand what is difficult, to configure the next hop
>> application to send 100 trying? Or maybe you can provide a diagram of how
>> sip traffic is routed on your case.
>>
>>
>> And even if Presence Server answers 200 OK, the Kamailio Proxy still
>> sends a repeated SIP PUBLISH there within the fr timer.
>>
>>
>> This remark is also not clear, is the 200ok handled by Kamailio, sent
>> upstream, but then Kamailio still resends the PUBLISH?
>>
>> Cheers,
>> Daniel
>>
>>
>>
>> чт, 4 февр. 2021 г. в 13:04, Daniel-Constantin Mierla <miconda at gmail.com
>> >:
>>
>>> Hello,
>>>
>>> if the 200ok is consumed by tm, it will destroy the transaction very
>>> soon. I am not sure this is a good path to go.
>>>
>>> If you need to stop the retransmission, a 100 trying should be sent
>>> instead of 200ok. Can you reconfigure the next hop to do that? Or is it out
>>> of your control?
>>>
>>> Cheers,
>>> Daniel
>>> On 04.02.21 11:47, Denys Pozniak wrote:
>>>
>>> Hello!
>>>
>>> In the configuration below Kamailio Proxy creates a transaction for the
>>> SIP PUBLISH to get info from the HTTP server in async mode.
>>> But before creating a transaction, a synthetic 200 OK is sent, so that I
>>> need somehow to drop the real 200 OK from the upstream Presence Server.
>>> If drop 200 OK in *reply_route*, tm module starts to retransmit.
>>> Those it is necessary that the 200 OK be consumed by the tm module, but
>>> does not go further.
>>>
>>>
>>> *if ( !is_method("PUBLISH") ) { *
>>>
>>>
>>> *        sl_send_reply("200", "Ok");         t_newtran(); *
>>>
>>>
>>> *        $http_req(suspend) = 1;          http_async_query("$var(url)",
>>> "CALLBACK"); *
>>> *}*
>>>
>>>
>>> *route[CALLBACK] { *
>>> *        <some header manipulation>*
>>>
>>>
>>>
>>> *        t_on_reply("PUBLISH_REPLY");         route(RELAY);
>>> exit; *
>>> *}*
>>>
>>>
>>>
>>>
>>>
>>>
>>> *onreply_route[PUBLISH_REPLY] {         if ( t_check_status("200") ) {
>>>               drop; # Does not work!!!         } } *
>>>
>>> Any advice is appreciated
>>>
>>> --
>>>
>>> BR,
>>> Denys Pozniak
>>>
>>>
>>>
>>> _______________________________________________
>>> Kamailio (SER) - Users Mailing Listsr-users at lists.kamailio.orghttps://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>
>>> --
>>> Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda
>>> Funding: https://www.paypal.me/dcmierla
>>>
>>>
>>
>> --
>>
>> BR,
>> Denys Pozniak
>>
>>
>> --
>> Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda
>> Funding: https://www.paypal.me/dcmierla
>>
>> _______________________________________________
>> Kamailio (SER) - Users Mailing List
>> sr-users at lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
> --
> Regards,
>
> David Villasmil
> email: david.villasmil.work at gmail.com
> phone: +34669448337
>


-- 

BR,
Denys Pozniak
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.kamailio.org/pipermail/sr-users/attachments/20210204/75dccc44/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 33009 bytes
Desc: not available
URL: <http://lists.kamailio.org/pipermail/sr-users/attachments/20210204/75dccc44/attachment.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 39122 bytes
Desc: not available
URL: <http://lists.kamailio.org/pipermail/sr-users/attachments/20210204/75dccc44/attachment-0001.png>