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
https://www.opensips-solutions.com
https://www.siphub.com
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
<[email protected]> 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
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--
Sincerely,
Giovanni Maruzzelli
OpenTelecom.IT
cell: +39 347 266 56 18
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