<div dir="ltr">First of all:<br>CONGRATULATIONS to the OpenSIPS community !!!<br>(I believe this is the first step of a long and satisfying journey)<br><br>On the topic:<br>in addition to the CSCF component, I would like to see efforts on the AS (Application Server) component of the IMS infrastructure.<div><br></div><div>The AS is probably way the simplest of it all, it will probably require the least modifications/additions to OpenSIPS.</div><div><br></div><div>But I would say AS will be crucial to a lot of people/use cases.</div><div><br></div><div>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.</div><div><br></div><div>Also, AS is the correct and manageable way to provide additional services even if you build the core IMS infrastructure.</div><div><br></div><div>About HSS: this is the sancta sanctorum of a carrier/provider<br>Apart from the venerable fraunhofer java implementation, now we can count on the flexible java implementation in <a href="https://github.com/nickvsnetworking/pyhss">https://github.com/nickvsnetworking/pyhss</a> with a lot of features, good performances, and actually built for production.</div><div><br></div><div>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.<br><br>MGCF/MGW, if needed, will be a natural extension of our CSCF/AS architecture.</div><div><br></div><div>Just my two cents, to keep the ball rolling,</div><div><br>Congratulation again,<br><br></div><div>-giovanni<br><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Nov 28, 2023 at 2:02 PM Bogdan-Andrei Iancu <<a href="mailto:bogdan@opensips.org">bogdan@opensips.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
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<font face="monospace">Hi all,<br>
<br>
(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)<br>
<br>
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.<br>
<br>
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 <b>Call Session Control Function (CSCF)</b>.
And here we need to look into and address the specific
functionalities of each sub-component: <br>
* P-CSCF<br>
* I-CSCF<br>
* S-CSCF<br>
<br>
Again, these are the pretty obvious components, still may look
into and evaluate (if of an interest of the OpenSIPS IMS
implementation) areas as:<br>
* HSS </font><font face="monospace"> (from interconnection
perspective)<br>
</font><font face="monospace"> * MGCF / MGW (from
interconnection perspective)<br>
* SIP AS<br>
* others ?<br>
<br>
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<br>
<br>
<br>
Best regards,<br>
</font>
<pre cols="72">--
Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a href="https://www.opensips-solutions.com" target="_blank">https://www.opensips-solutions.com</a>
<a href="https://www.siphub.com" target="_blank">https://www.siphub.com</a></pre>
</div>
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</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature">Sincerely,<br><br>Giovanni Maruzzelli<br>OpenTelecom.IT<br>cell: +39 347 266 56 18<br><br></div>