Thanks for reply.

What made me think the last scenario may work(e.g. the one with 200OK on peer dmq node) was beacause I am seeing DMQ dialog state updates e.g. state 4 for 200 OK (and state 5 for BYE) if same kamailio that received the INVITE, also receives 200 OK (and BYE).


---
Stefan

From: Alex Balashov via sr-users <sr-users@lists.kamailio.org>
Sent: Friday, January 26, 2024 2:11:29 PM
To: Kamailio (SER) - Users Mailing List
Cc: Alex Balashov
Subject: [SR-Users] Re: DMQ dialog sync question
 
I'm not sure of the internals, and am just speculating here, but I suspect that dialog replication through DMQ is about synchronising profile membership/counts only, and will not deliver the entire dialog state machine life cycle to all cluster members.

To fully deserialise the dialog state into runtime on every DMQ node would require instantiating TM callbacks into dialog state as well, which ultimately requires replicating TM state, which is not supported. Even if it were supported, it would be problematic, e.g. in Anycast scenarios where timers from Kam1 are now expiring on Kam2, even though Kam2 is not expected to receive any dialog updates directly, etc.

-- Alex

> On 26 Jan 2024, at 06:50, Stefan-Cristian Mititelu via sr-users <sr-users@lists.kamailio.org> wrote:
>
> Hi,
>
> I'm trying a DMQ dialog sync up setup with 2 x Kamailios. I have this scenario:
>     • Kamailio1 receives INVITE and sends KDQM to Kamailio2 to sync up dialog => OK
>     • Kamailio2 receives 200OK
>     • Kamailio2 does not send anything back to Kamailio1 to update dialog state => not OK, i expected a KDMQ to be send back to Kamailio1 to update dialog state
>
> I was wondering if DMQ module supports the above? I am using 5.6 version of kamailio, and I am curios if this might be implemented in later branches?
>
> Thank you,
> Stefan
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--
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800

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