<div dir="auto">Yes, actually there is a difference between 5g and 4g infrastructure, that actually often involve different interfacing from IMS to it, particularly pcscf and icscf, eg: the way they interact with hss and pcf/pcrf.<div dir="auto">Problem is that 4g infrastructure is different from 5g. When they implement 4g+5g, they implement actually both (so, no problem)</div><div dir="auto"><br></div><div dir="auto">4g+5g is called NSA (not stand alone)</div><div dir="auto"><br></div><div dir="auto">A pure 5g is SA (stand alone) and offer different interfaces from the ones provided by 4g.</div><div dir="auto"><br></div><div dir="auto">In NSA you (IMS) can behave like it's pure 4g (you use 4g interfaces to do all things, even for the 5g part)</div><div dir="auto"><br></div><div dir="auto">In SA not at all, you must interface to 5g</div><div dir="auto"><br></div><div dir="auto">The main difference for what ims is concerned is pcf vs pcrf</div><div dir="auto"><br></div><div dir="auto">Let's note that most private networks (enterprise, etc) will be SA</div><div dir="auto"><br></div><div dir="auto">Most carriers will obviously be NSA</div><div dir="auto"><br></div><div dir="auto"><br><br><div data-smartmail="gmail_signature" dir="auto">answered from mobile, please pardon terseness and typos,<br>-giovanni</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Nov 29, 2023, 18:25 Bogdan-Andrei Iancu <<a href="mailto:bogdan@opensips.org">bogdan@opensips.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div>
<font face="monospace">Hi Johan,<br>
<br>
The lowest point we should address in the whole IMS arch is the
P-CSCF, so we are agnostic to the actual transport layer below us
(like the xG stuff). Or am I saying here something wrong and there
are some implications to the upper layers ?<br>
<br>
Regards,<br>
</font>
<pre cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a href="https://www.opensips-solutions.com" target="_blank" rel="noreferrer">https://www.opensips-solutions.com</a>
<a href="https://www.siphub.com" target="_blank" rel="noreferrer">https://www.siphub.com</a></pre>
<div>On 29.11.2023 18:07, Johan De Clercq
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">In addition, the IMS should be able to handle 4G
and 5G calls.
<div>In my opinion, we should no longer about 2 and 3 G as they
are being phased out everywhere. </div>
<div><br>
</div>
<div>wkr, </div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Op wo 29 nov 2023 om 16:39
schreef Bogdan-Andrei Iancu <<a href="mailto:bogdan@opensips.org" target="_blank" rel="noreferrer">bogdan@opensips.org</a>>:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> <font face="monospace">Hi Giovanni,<br>
<br>
Thanks for the feedback here, a valuable one as usual :).<br>
<br>
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).<br>
<br>
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... :-/ ??<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" rel="noreferrer">https://www.opensips-solutions.com</a>
<a href="https://www.siphub.com" target="_blank" rel="noreferrer">https://www.siphub.com</a></pre>
<div>On 29.11.2023 11:11, Giovanni Maruzzelli wrote:<br>
</div>
<blockquote type="cite">
<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" target="_blank" rel="noreferrer">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" target="_blank" rel="noreferrer">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">
<div> <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" rel="noreferrer">https://www.opensips-solutions.com</a>
<a href="https://www.siphub.com" target="_blank" rel="noreferrer">https://www.siphub.com</a></pre>
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<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>
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