[OpenSIPS-Users] [WG-IMS] Scope of IMS in OpenSIPS - RFC

Bogdan-Andrei Iancu bogdan at opensips.org
Wed Nov 29 15:38:13 UTC 2023

Hi Giovanni,

Thanks for the feedback here, a valuable one as usual :).

On the HSS, what you are saying aligns with the my own thoughts - that 
its functioning logic is somehow outside the our scope here, but we need 
to pay attention to the interfacing (DIAMETER or HTTP2.0).

Now, on the AS side - as I understand, it holds whatever custom logic 
the operator may have in routing and proving services (included VAS's). 
So to say, I see it as a highly programmable component. And if so, what 
we need to provide here is probably a very high level interface / API to 
allow call manipulation in a very abstract way... :-/ ??

Best Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer

On 29.11.2023 11:11, Giovanni Maruzzelli wrote:
> First of all:
> CONGRATULATIONS to the OpenSIPS community !!!
> (I believe this is the first step of a long and satisfying journey)
> On the topic:
> in addition to the CSCF component, I would like to see efforts on the 
> AS (Application Server) component of the IMS infrastructure.
> The AS is probably way the simplest of it all, it will probably 
> require the least modifications/additions to OpenSIPS.
> But I would say AS will be crucial to a lot of people/use cases.
> While for sure there will be a lot of cases for our community to build 
> the voice/video complete IMS infrastructure on top of private 5G 
> networks in enterprises and public administrations, I see as very much 
> relevant also the use case of building infrastructure to provide 
> additional third party services to big carriers, and to big carriers 
> partners.
> Also, AS is the correct and manageable way to provide additional 
> services even if you build the core IMS infrastructure.
> About HSS: this is the sancta sanctorum of a carrier/provider
> Apart from the venerable fraunhofer java implementation, now we can 
> count on the flexible java implementation in 
> https://github.com/nickvsnetworking/pyhss with a lot of features, good 
> performances, and actually built for production.
> I would say better we concentrate on accessing the various different 
> protocols of HSS (diameter/http2) from the various components (each 
> component in IMS access HSS with a different interface with 
> different vocabularies and actions.
> MGCF/MGW, if needed, will be a natural extension of our CSCF/AS 
> architecture.
> Just my two cents, to keep the ball rolling,
> Congratulation again,
> -giovanni
> On Tue, Nov 28, 2023 at 2:02 PM Bogdan-Andrei Iancu 
> <bogdan at opensips.org> wrote:
>     Hi all,
>     (disclaimer : cross lists posting is not a good practice - we will
>     do this only to catch the attention and get momentum with this
>     initial topic)
>     As a first step here, is to work out the scope of the IMS
>     implementation in OpenSIPS. IMS is a vast concept, with SIP and
>     non-SIP components, and we want to understand and agree on which
>     components of IMS may be subject of work from the OpenSIPS
>     perspective. For example, we do consider the CSCF as a must here,
>     but we may explore the HSS, AS, MGW or other components.
>     From the OpenSIPS perspective, we look for IMS components which
>     are SIP related. At least as a starting point. So, the first
>     obvious candidate is the *Call Session Control Function (CSCF)*.
>     And here we need to look into and address the specific
>     functionalities of each sub-component:
>         * P-CSCF
>         * I-CSCF
>         * S-CSCF
>     Again, these are the pretty obvious components, still may look
>     into and evaluate (if of an interest of the OpenSIPS IMS
>     implementation) areas as:
>         * HSS (from interconnection perspective)
>         * MGCF / MGW  (from interconnection perspective)
>         * SIP AS
>         * others ?
>     Any feedback (with explanations and arguments) about what we
>     should consider for our IMS implementation is more the welcome. I
>     set here just a simple starting point, with no limitations or so.
>     Feel free to contribute to the topic
>     Best regards,
>     -- 
>     Bogdan-Andrei Iancu
>     OpenSIPS Founder and Developer
>        https://www.opensips-solutions.com
>        https://www.siphub.com
>     _______________________________________________
>     Wg-ims mailing list
>     Wg-ims at lists.opensips.org
>     http://lists.opensips.org/cgi-bin/mailman/listinfo/wg-ims
> -- 
> Sincerely,
> Giovanni Maruzzelli
> OpenTelecom.IT
> cell: +39 347 266 56 18
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