Hello!

> the 200ok for PUBLISH contains some additional headers (e.g., relate to ETag) that must be used in follow-up PUBLISH requests, are you sure that replying from intermediary proxy, not the presence server is resulting in what you want to have?
Yes, in our current logic the fields SIP-ETag, SIP-If-Match, Expires are not needed yet.

> If the first 200ok is to stop retransmission, then I said, try with 100 trying response from intermediary proxy.
Added 100 Trying from Intermediate Proxy to Upstream direction, but nothing has changed (Intermediate Proxy ignores 200ok from Presence and sends PUBLISH again).


image.png


пт, 5 февр. 2021 г. в 11:57, Daniel-Constantin Mierla <miconda@gmail.com>:

Hello,

the 200ok for PUBLISH contains some additional headers (e.g., relate to ETag) that must be used in follow-up PUBLISH requests, are you sure that replying from intermediary proxy, not the presence server is resulting in what you want to have?

If the first 200ok is to stop retransmission, then I said, try with 100 trying response from intermediary proxy.

Cheers,
Daniel

On 04.02.21 14:33, Denys Pozniak wrote:
> 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.png

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

image.png

чт, 4 февр. 2021 г. в 14:55, David Villasmil <david.villasmil.work@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@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@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



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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Funding: https://www.paypal.me/dcmierla


--

BR,
Denys Pozniak


-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Funding: https://www.paypal.me/dcmierla
_______________________________________________
Kamailio (SER) - Users Mailing List
sr-users@lists.kamailio.org
https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
--
Regards,

David Villasmil
phone: +34669448337


--

BR,
Denys Pozniak


-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Funding: https://www.paypal.me/dcmierla


--

BR,
Denys Pozniak