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

[Julien Chavanton]

Maybe a $dlg_var instead of an htable
...

On Mon, Oct 5, 2020 at 2:50 PM Julien Chavanton <jchavanton at gmail.com>
wrote:

> 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:
>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> I am not quite sure, but I would try to store a long-term flag with
>>>>> the help of the dialog module.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> [...]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. [...]
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> [...]10.6. $dlg_var(key)
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> 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().
>>>>>
>>>>>
>>>>>
>>>>> Note: You will receive "NULL", if there is no dialog for this
>>>>> request.[...]
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Hint: ACK is a subsequential request
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Anyway, I am wondering if your approach would be compliant to RFC 3261.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> KR
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> ------------------------------
>>>>>
>>>>>
>>>>> *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
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> 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?).
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Is it possible? How could I accomplish this?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Thanks,
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Valter
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>>
>>>>> 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
>>>>
>>> _______________________________________________
>>> Kamailio (SER) - Users Mailing List
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>>>
>>
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