[SR-Users] DMQ and DIALOG

[Alex Balashov]

Agree. There is a general need for transaction-associated replies and dialog-associated in-dialog requests (and their replies) to all go to the same node. There are Via and Record-Route attributes you can set to make this happen, assuming you're opposed to the load balancer keeping state based on a hash over the Call-ID or something. 

The LB role is extremely natural for a proxy like Kamailio, BTW, since it follows Via and Route anyway just by definition. Dumb (that is, protocol-unaware) load balancers which just generically round-robin UDP messages won't work with SIP, because this method assumes that no UDP message is related to any other. In SIP that is a completely invalid assumption and the relationships are manifold.

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-----Original Message-----
From: Brandon Armstead <brandon at cryy.com>
To: "Kamailio (SER) - Users Mailing List" <sr-users at lists.kamailio.org>
Sent: Wed, 24 Oct 2018 12:01 PM
Subject: Re: [SR-Users] DMQ and DIALOG

Set a cookie and relay those subsequent transactions down to proper
endpoint that they initially went over.

On Wed, Oct 24, 2018 at 1:56 AM Phillman25 Kyriacou <phillman25 at gmail.com>
wrote:

> Hi List!
>
> I currently have 3 Kamailio's (Version 5.1) in an ACTIVE-ACTIVE-ACTIVE
> scenario behind a load balancer all 3 nodes are listening and advertising
> the same virtual ip of the load balancer. Im using dmq module together with
> dialogue module to sync the state of the dialog to all 3 nodes. Is there a
> way or module that i can use to also sync every transaction?
>
> Problem that im facing right now is that an INVITE will come to Kamailio1
> and the 100 TRYING or 183 RINGING or  200OK will go to Kamailio2 and since
> Kamailio1 hasn't received a response will retransmit the INVITE. Or is
> there a way with dmq to also update the other nodes for responses like 100
> ,183 or 200 OK so that Kamailio1 knows not to retransmit?
>
> Maybe im going down the wrong path? :)
>
> Any assistance would be greatly appreciated
>
> My config for dmq and dialog:
>
> #=====================DIALOG====================================
> modparam("dialog", "enable_dmq", 1)
>
> #=====================DMQ=======================================
> modparam("dmq", "server_address", "sip:x.x.x.x:5080")
> modparam("dmq", "notification_address", "sip:y.y.y.y:5080")
> modparam("dmq", "multi_notify", 1)
> modparam("dmq", "num_workers", 4)
> modparam("dmq", "ping_interval", 30)
>
> request_route {
>
>     # MANAGE ALL DIALOGS
>        dlg_manage();
>
> if(is_method("KDMQ"))
>         {
>                 dmq_handle_message();
>         }
>
> Thanks!
> Phillip
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