Found it:

https://github.com/kamailio/kamailio/issues/1591#issuecomment-409205552

On Tue, Oct 1, 2019 at 07:15 Joel Serrano <j...@textplus.com> wrote:

> Just a note, I would suggest to use htable+dmq to  do such limits,
> dialog+dmq has some issues when handling dialog expiration when a node for
> whatever reason is restarted.. (search GH issues and you will find one with
> a long thread where Charles explains the reasons: TL;DR: You could  end up
> having inconsistent dialog information with dialog+dmq)
>
> Hope it helps!
> Joel.
>
> On Tue, Oct 1, 2019 at 01:02 Daniel-Constantin Mierla <mico...@gmail.com>
> wrote:
>
>>
>> On 30.09.19 14:55, Daniel Tryba wrote:
>> > On Sun, Sep 29, 2019 at 11:03:47AM +0300, Olli Attila wrote:
>> >> modparam("dialog", "profiles_with_value", "concurrent_calls")
>> >> modparam("dialog", "dlg_flag", 4)
>> >> modparam("dialog", "db_url", DBURL)
>> >> modparam("dialog", "db_mode", 1)
>> >
>> > Have you tested with a lower value of
>> >
>> https://kamailio.org/docs/modules/5.1.x/modules/dialog.html#dialog.p.update_period
>>
>>
>> The update_period should have no impact when db_mode=1 -- in this case
>> the records are written to database immediately. I think update_period
>> is intended only for db_mode=2.
>>
>> Cheers,
>> Daniel
>>
>>
>> > I have it set to 5, but for some reason I'm not using get_profile_size
>> >
>> > For inbound:
>> > $var(maxchannels) = 0;
>> > sql_xquery("ca", "select count(id) as c from dialog where xdata like
>> '%maxchannels%$rU%' and timeout>unix_timestamp()", "ra");
>> > $var(maxchannels)=$xavp(ra=>c);
>> > sql_result_free("ra");
>> >
>> > For outbound:
>> > sql_xquery("ca", "select count(id) as c from dialog where xdata like
>> '%maxchannels%$au%' and timeout>unix_timestamp()", "ra");
>> > $var(maxchannels)=$xavp(ra=>c);
>> > sql_result_free("ra");
>> >
>> > Pasting the code here I see this isn't that secure since a user foo also
>> > gets the number of calls for foobar counted against him! Off to put a "
>> > before/after the username.
>> >
>> >
>> > _______________________________________________
>> > Kamailio (SER) - Users Mailing List
>> > sr-users@lists.kamailio.org
>> > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
>> --
>> Daniel-Constantin Mierla -- www.asipto.com
>> www.twitter.com/miconda -- www.linkedin.com/in/miconda
>> Kamailio Advanced Training, Oct 21-23, 2019, Berlin, Germany --
>> https://asipto.com/u/kat
>>
>>
>> _______________________________________________
>> Kamailio (SER) - Users Mailing List
>> sr-users@lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
>
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