[SR-Users] Time elapsed since previous message.

[David Villasmil]

Some providers have other providers which many times just answer the call
and try to keep it there. It’s a known strategy some scammers use. Getting
a 180/3 in say; 500ms (to a real-life hard line, is probably one such call.


On Wed, 10 Feb 2021 at 18:52, Raúl Alexis Betancor Santana <
rbetancor at serlink.es> wrote:

> What is the point of refusing a call that answer with a 100/183 "too
> quickly" ? ... I don't get the point on that.
>
> Saludos
> --
> *Raúl Alexis Betancor Santana*
> Serlink Telecom S.R.L.U.
>
> ------------------------------
> *De: *"David Villasmil" <david.villasmil.work at gmail.com>
> *Para: *"Kamailio (SER) - Users Mailing List" <sr-users at lists.kamailio.org
> >
> *Enviados: *Miércoles, 10 de Febrero 2021 9:57:35
> *Asunto: *Re: [SR-Users] Time elapsed since previous message.
>
> Hello Alex,
> Again thanks.
>
> I'm using that calculation to, when receiving a 180/3, if it comes in too
> quickly (i.e. 100ms) i cancel that call, and send a 480 the the A leg.
> I haven't found way of doing this, is this possible at all? I trired
> setting a very low t_set_fr(10,10) (0 means set the default), but that's
> not working...
>
> Is there a way of doing this?
>
> Thanks!
> Regards,
>
> David Villasmil
> email: david.villasmil.work at gmail.com
> phone: +34669448337
>
>
> On Tue, Feb 9, 2021 at 3:31 PM David Villasmil <
> david.villasmil.work at gmail.com> wrote:
>
>> Thanks Alex,
>>
>> Exactly what I was thinking. Just wondering whether there was a better
>> way.
>>
>> Again THANKS!
>>
>> David
>>
>> On Tue, 9 Feb 2021 at 14:56, Alex Balashov <abalashov at evaristesys.com>
>> wrote:
>>
>>> Hi,
>>> You can store the timestamp of the last message of interest in a
>>> transaction-persistent variable - that is, an AVP or XAVP - using $TV():
>>>
>>> https://www.kamailio.org/wiki/cookbooks/5.4.x/pseudovariables#tv_name
>>>
>>> Then, you can do some arithmetic like this to turn the difference
>>> between two timestamps into milliseconds. This is stolen straight from CSRP
>>> so adapt to your needs. :-)
>>>
>>> 	# Log request processing time.
>>>
>>> 	$var(cur_time) = $TV(Sn);
>>>
>>> 	$var(proc_diff) = (
>>> 		(((
>>> 		  $(var(cur_time){s.select,0,.}{s.int}) -
>>> 		  $(avp(proc_start){s.select,0,.}{s.int})
>>> 		) * 1000000)
>>> 		+
>>> 		(
>>> 		 $(var(cur_time){s.select,1,.}{s.int}) -
>>> 		 $(avp(proc_start){s.select,1,.}{s.int})
>>> 		) / 1000) mod 1000
>>> 	);
>>>
>>>
>>> — Alex
>>>
>>> —
>>> Sent from my iPad
>>>
>>> On Feb 9, 2021, at 9:40 AM, David Villasmil <
>>> david.villasmil.work at gmail.com> wrote:
>>>
>>> Hello all,
>>>
>>>
>>> Is it possible to know the elapsed time since the previously received
>>> message?
>>>
>>> On outgoing calls, I.e: when i get a 180, how long did the 100 arrived?
>>> Or the INVITE...
>>>
>>> Thanks
>>>
>>> David
>>> --
>>> 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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>>> Kamailio (SER) - Users Mailing List
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>>>
>> --
>> Regards,
>>
>> David Villasmil
>> email: david.villasmil.work at gmail.com
>> phone: +34669448337
>>
>
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>
-- 
Regards,

David Villasmil
email: david.villasmil.work at gmail.com
phone: +34669448337
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