[SR-Users] [DMQ] Sync DLG_STATE_CONFIRMED_NA dialog state ?

[Daniel-Constantin Mierla]

Hello,
I haven't worked on the dmq replication for dialogs, so not sure why that
state is not replicated, but I think that would be the right solution if
the lack of replication creates issues.

Cheers,
Daniel

On Mon, Jul 1, 2019 at 12:34 PM Mathieu Bodjikian <
mathieu.bodjikian at corp.ovh.com> wrote:

> Hello,
>
> We are using DMQ module to sync dialogs between 3 Kamailio boxes.
>
> We are using last Kamailio version (5.2.3).
>
> From our understanding, the state  DLG_STATE_CONFIRMED_NA is not synced
> over DMQ (
> https://github.com/kamailio/kamailio/blob/a84a3ea618f0e602a8892c37fce7f4e72ab7371c/src/modules/dialog/dlg_dmq.c#L464
> )
>
> With containerized environement, the ACK's can go to any Kamailio
> instance, which lead to :
>
> On first box :
>     -> INVITE    received   -> Dialog created + KDMQ sent (state
> DLG_STATE_UNCONFIRMED)
>     -> 180 | 183 received   -> Dialog updated + KDMQ sent (state
> DLG_STATE_EARLY)
>     -> 200       received   -> Dialog updated + KDMQ NOT sent
> (DLG_STATE_CONFIRMED_NA)
>
> On second box :
>     -> ACK received :
>         - next_state_dlg(): bogus event 6 in state 2 for dlg
>         - dialog not updated
>         - KDMQ with state DLG_STATE_CONFIRMED not sent
>
>
> On first box, after timeout :
>    -> After timeout :
>         - dialg with incorrect timeouts (since box2 didn't send dialog
> update)
>         - tm sends BYE in both ways
>         - bye_reply_cb(): inconsitent dlg timer data on dlg
>
>
>
> We see two solutions :
>     - We add DLG_STATE_CONFIRMED_NA to states we sync on
> dlg_dmq_replicate_action
>
>     - We manage to route the ACK on the same instance that received first
> INVITE (could be tricky)
>
>
> Which one is preferable ?
>
>
> Kind regards,
> Mathieu Bodjikian
>
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-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
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