[SR-Users] Drop calls with response 200 without previous 180/183 reponses

[Julien Chavanton]

You could use an htable and wait for the ACK to dlg_bye the caller.

Or you could try rewriting the response and sending dlg_bye to the callee,
just seems less predictable in terms of what can happen.


On Mon, Oct 5, 2020 at 2:47 PM Julien Chavanton <jchavanton at gmail.com>
wrote:

> Indeed, the call must be disconnected properly.
> I would not rewrite the code unless absolutely necessary to avoid edge
> cases.
> Kamailio can do some in the middle UAC tasks, in this case maybe you could
> look at :
> dialog module dlg_bye(side)
>
> On Mon, Oct 5, 2020 at 6:05 AM Valter Nogueira <valter at fastway.com.br>
> wrote:
>
>> Thank you people. It seems an easy approach using htable.
>>
>> I was wondering that this is not compliant with RFC 3261, since a proxy
>> should not change sip responses.
>>
>> In fact not only I should change the sip response but I should send a BYE
>> on behalf of the UAC. It seems like a B2BUA
>>
>>
>> Em sáb, 3 de out de 2020 12:45, David Villasmil <
>> david.villasmil.work at gmail.com> escreveu:
>>
>>> Kamailio is so cool, you could even do it without the dialog module. You
>>> could simply use a hash table (htable module) and when/if a 183/180 is
>>> received store the callid in the table (with an expiration). Anytime a 200
>>> is received check the table (it’s in memory, so really fast), if not found,
>>> reject.
>>> Super simple.
>>>
>>>
>>> On Sat, 3 Oct 2020 at 13:51, Valentin Christoph <
>>> Christoph.Valentin at kontron.com> wrote:
>>>
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>>>> I am not quite sure, but I would try to store a long-term flag with the
>>>> help of the dialog module.
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>>>> [...]The dialog module provides dialog awareness for the Kamailio
>>>> proxy. It's functionality is to keep track of the current dialogs, to offer
>>>> information about them (e.g. how many dialogs are active), and to manage
>>>> various characteristics of dialogs. The module
>>>>
>>>> exports several functions that can be used directly from the
>>>> configuration route script as well as functions for the RPC interface. [...]
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>>>> [...]10.6. $dlg_var(key)
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>>>> This is a read/write variable that can be used to store custom values
>>>> assigned with a dialog (e.g. the URI of a billing-server, an assigned
>>>> emergency-server). This pseudo-variable will be available only for
>>>> subsequential requests after doing loose_route().
>>>>
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>>>> Note: You will receive "NULL", if there is no dialog for this
>>>> request.[...]
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>>>> Hint: ACK is a subsequential request
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>>>> Anyway, I am wondering if your approach would be compliant to RFC 3261.
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>>>> KR
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>>>> ------------------------------
>>>>
>>>>
>>>> *Von:* sr-users <sr-users-bounces at lists.kamailio.org> im Auftrag von
>>>> Valter Nogueira <valter at fastway.com.br>
>>>>
>>>>
>>>> *Gesendet:* Freitag, 2. Oktober 2020 17:01
>>>>
>>>>
>>>> *An:* Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
>>>>
>>>>
>>>> *Betreff:* [SR-Users] Drop calls with response 200 without previous
>>>> 180/183 reponses
>>>>
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>>>> I would like to use Kamailio to drop every call that is answered with
>>>> no previous 180 / 183 responses or with 180 / 183 responses with no media
>>>> attached (no SDP?).
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>>>> Is it possible? How could I accomplish this?
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>>>> Thanks,
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>>>> Valter
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>>>> _______________________________________________
>>>>
>>>> Kamailio (SER) - Users Mailing List
>>>>
>>>> sr-users at lists.kamailio.org
>>>>
>>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>>
>>>> --
>>> Regards,
>>>
>>> David Villasmil
>>> email: david.villasmil.work at gmail.com
>>> phone: +34669448337
>>> _______________________________________________
>>> Kamailio (SER) - Users Mailing List
>>> sr-users at lists.kamailio.org
>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>
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>
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