[OpenSIPS-Users] uac_registrant : Is there any way to de register particular registrant ?

[Donat Zenichev]

Good day Sagar!
Following the RFC 3261 requirements, which is the mostly used version of
the RFC for the SIP protocol, we have the following ways to do that:
- send a registration from behalf of a currently registered subscriber,
with the "Expires:" header set to "0" value ;
- send a registration from behalf of a currently registered subscriber,
with the ";expires=" parameter of the "Contact:" header set to "0" value ;
- send a registration from behalf of a currently registered subscriber,
with the "Contact:" header set to "*" value ;

I should mention that the last definition, with a "Contact:" header set to
"*" might be a non-working solution.
I haven't ever tested this with OpenSIPS. So better to stick to the first
two options.

Other than that, I'm not sure if the location record can be deleted
manually without an impact on the subscriber's experience.
What I mean to say by that, is that even though you delete a location
record from mysql, the subscriber still expects that the location is modern
and inbound calls are available.
So this method looks a bit harsh.

On the other hand, the way how the OpenSIPS treats your location records,
in terms of using the backend, depends on which "db_mode" you have picked
out for "usrloc.so":
https://opensips.org/html/docs/modules/3.0.x/usrloc.html#param_db_mode

So in case, if you just want to strictly delete certain location record of
certain subscriber, and by doing that, you expect the user to drift away,
this will not work out if your "db_mode" of the "usrloc.so" is set to
"single-instance-sql-write-back". As the general source here would be the
cache and not sql backend.

Still I might be mistaken at some point, and I would first of all advise
you to read this articles:
- Section "Registrations" in the RFC 3261 -
https://tools.ietf.org/html/rfc3261#section-10
- Documentation for the "usrloc.so" module of OpenSIPS -
https://opensips.org/html/docs/modules/3.0.x/usrloc.html
- Documentation for the "registrar.so" module of OpenSIPS -
https://opensips.org/docs/modules/3.0.x/registrar.html

And also there might be a sense to read about MI functionality (as this can
have somehow help to achieve your goal):
https://www.opensips.org/Documentation/Interface-MI-3-0

I hope my answer was useful for you.

On Thu, Dec 10, 2020 at 2:56 PM sagar malam <sagarmalam at gmail.com> wrote:

> Hello,
>
> I am using uac registrant module to register with Remote SIP server(RSS) .
> I would like to have a way to tell opensips to de
> register  particular registrant from RSS. Is there a way to do it ?
>
> I tried to remove the registrant entry  from the database and reload list
> via MI command but that does not work.
> --
> Thanks,
>
> Sagar
> _______________________________________________
> Users mailing list
> Users at lists.opensips.org
> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>


-- 

Best regards,
Donat Zenichev
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