[sr-dev] uac dialog callback and kamailio restarts

[Daniel-Constantin Mierla]

Hello,

well, to be clear, I do not know if it should work for uac, I haven't
used replace from/to with dialog so far. But I remember I saw in the
past some code/discussions related to callbacks at startup when loading
database records from dialog table.

Cheers,
Daniel

On 10.04.19 09:05, Henning Westerholt wrote:
> Hi Daniel,
>
> thank you, will have a look to the cnxcc module, good hint. Good to know 
> that it should working even after a restart.
>
> Cheers,
>
> Henning
>
> Am 10.04.19 um 08:56 schrieb Daniel-Constantin Mierla:
>> Hello,
>>
>> I had in mind to check the code and be sure, but I forgot about it ...
>> so, I think there is already a callback function that is executed by
>> dialog module when loading records from database. Maybe uac module is
>> not registering itself for it, or does it too late. Just look at what
>> callbacks dialog exports, eventually see cnxcc module to see if it does
>> something on this regard -- it depends on dialog and I expect it works
>> also after restarting.
>>
>> Cheers,
>> Daniel
>>
>> On 10.04.19 08:41, Henning Westerholt wrote:
>>> Hello,
>>>
>>> any comments on this?
>>>
>>> Thanks and regards,
>>>
>>> Henning
>>>
>>> Am 05.04.19 um 17:03 schrieb Henning Westerholt:
>>>> Hello,
>>>>
>>>> I am working right now on another difficult topic related to the usage
>>>> of uac dialog callbacks for the usual replace from/to header logic
>>>> after a kamailio restart.
>>>>
>>>> The uac/dialog module combination works just fine - but after a
>>>> kamailio restart the dialog callback information is lost. So this
>>>> means that for already established dialogs no from/to replacement
>>>> operations are done. This causes errors later on during BYE or
>>>> Re-INVITE signalization.
>>>>
>>>> I verified this with debug logging and can easily test this on a test
>>>> system.
>>>>
>>>> One obvious workaround is of course not use the dialog module to store
>>>> the data inside dialog variables.
>>>>
>>>> An approach to work on this problem would be to store the uac callback
>>>> in the dialog table(s) as well, and then during kamailio startup use
>>>> this to re-install the uac callback.
>>>>
>>>> Does this approach sounds feasible? Any other ideas how to tackle this
>>>> issue?

-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio World Conference - May 6-8, 2019 -- www.kamailioworld.com