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<font face="monospace">agreed, we can look into the UPDATE stuff,
but let's take it one at a time (as they are not related)... First
the PRACK :)<br>
<br>
Regards,<br>
</font>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="https://www.opensips-solutions.com">https://www.opensips-solutions.com</a>
<a class="moz-txt-link-freetext" href="https://www.siphub.com">https://www.siphub.com</a></pre>
<div class="moz-cite-prefix">On 12.01.2026 18:17, Johan De Clercq
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:AM9PR10MB42953264815F1C5762BE4441A781A@AM9PR10MB4295.EURPRD10.PROD.OUTLOOK.COM">
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<div>I think that 200 ok’ing UPDATE also should be added. This
seems useful when opensips is used as sbc/b2bua (maybe this
can go in topology_hiding.so).</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">For the rest, I think that your approach is
complete.</div>
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Verzonden vanuit <a href="https://aka.ms/o0ukef"
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<div id="divRplyFwdMsg" dir="ltr"><font
face="Calibri, sans-serif"><b>Van:</b> Users
<a class="moz-txt-link-rfc2396E" href="mailto:users-bounces@lists.opensips.org"><users-bounces@lists.opensips.org></a> namens
Bogdan-Andrei Iancu <a class="moz-txt-link-rfc2396E" href="mailto:bogdan@opensips.org"><bogdan@opensips.org></a><br>
<b>Verzonden:</b> maandag, januari 12, 2026 5:06 PM<br>
<b>Aan:</b> <a class="moz-txt-link-abbreviated" href="mailto:gmaruzz@opentelecom.it">gmaruzz@opentelecom.it</a>
<a class="moz-txt-link-rfc2396E" href="mailto:gmaruzz@opentelecom.it"><gmaruzz@opentelecom.it></a><br>
<b>CC:</b> OpenSIPS users mailling list
<a class="moz-txt-link-rfc2396E" href="mailto:users@lists.opensips.org"><users@lists.opensips.org></a><br>
<b>Onderwerp:</b> Re: [OpenSIPS-Users] PRACK
interworking requirements
<div> </div>
</font></div>
<font face="monospace">Hey all and A Happy New Year !<br>
<br>
Pocking again the topic.... based on the discussion, I see
two approached (they do not exclude one each other):<br>
<br>
a) manual - to generate the PRACK explicitly from script,
when handling a reply. As Vlad mentioned, maybe something
based on dlg_send_sequential() (but tricky when handling
multiple branches / to-tags from upstream). Answering to a
PRACK can be done even now, so not a problem. Also
inserting the related Supported / Requires hdrs, again,
can be done from script.<br>
<br>
b) auto-mode - to be transparently provided by the dialog
module. To be activated by a create_dialog() flag,
resulting in auto generating the PRACKs (based on the
hdr's in the reply). The module should be also responsible
of replying to the PRACK requests and to adjust the hdrs
too.<br>
<br>
Does this sound like a plan ?<br>
<br>
Regards,<br>
</font>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext"
href="https://www.opensips-solutions.com"
moz-do-not-send="true">https://www.opensips-solutions.com</a>
<a class="moz-txt-link-freetext" href="https://www.siphub.com"
moz-do-not-send="true">https://www.siphub.com</a></pre>
<div class="moz-cite-prefix">On 25.11.2025 13:14, Giovanni
Maruzzelli wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">
<div dir="auto"><br>
</div>
<div class="gmail_quote gmail_quote_container"
dir="auto">
<div dir="ltr" class="gmail_attr">On Tue, Nov 25,
2025, 11:57 Bogdan-Andrei Iancu <<a
href="mailto:bogdan@opensips.org"
class="moz-txt-link-freetext"
moz-do-not-send="true">bogdan@opensips.org</a>>
wrote:</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"><br>
The result here should be a dlg dedicated
function to generate a PRACK from the
onreply_route, like "dlg_answer_with_prack()"
kind of function? or should we look into a more
automatic approach, like flagging the dialog at
creation to automatically generate the PRACK
upon replies flagged with so?<br>
</font></div>
</blockquote>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">personally I'm a control freak and would
like better an explicit function, maybe even with
parameters to modify things if needed :))</div>
<div dir="auto"><br>
</div>
<div dir="auto">-giovanni</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div class="gmail_quote gmail_quote_container"
dir="auto">
<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"><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" class="moz-txt-link-freetext"
moz-do-not-send="true">https://www.opensips-solutions.com</a>
<a href="https://www.siphub.com" target="_blank" rel="noreferrer"
class="moz-txt-link-freetext"
moz-do-not-send="true">https://www.siphub.com</a></pre>
<div>On 25.11.2025 11:46, Giovanni Maruzzelli
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>
<div>hello OpenSIPSers,</div>
<div><br>
</div>
<div>in previous mails has been noticed that
various ITSPs are starting to require
PRACK support.</div>
<div><br>
</div>
<div>We know that PRACK belongs to
endpoints, specifically phones and B2BUAs.</div>
<div><br>
</div>
<div>But...</div>
<div><br>
</div>
<div>There can be a use case where OpenSIPS
will work as SBC (not necessarily using
the b2b module)</div>
<div><br>
</div>
<div>So, we can have a case where we would
like to support that the dialogue module
insert the 100rel in the Supported:
INVITE's header, and manage to send a
PRACK method to acknowledge provisional
responses</div>
<div><br>
</div>
<div>If and when 100rel/PRACK are
"generated" by OpenSIPS, they will be
filtered out (not propagated) to/from the
endpoints, even if the endpoint would like
to support it</div>
<div><br>
</div>
<div>Reference RFC: <a
href="https://www.ietf.org/rfc/rfc3262.txt" target="_blank"
rel="noreferrer"
class="moz-txt-link-freetext"
moz-do-not-send="true">https://www.ietf.org/rfc/rfc3262.txt</a></div>
<div><br>
</div>
<div>I believe this will be enough to make
ITSPs happy.</div>
<div><br>
</div>
<div>Further developments can be moved to
future.</div>
<div><br>
</div>
<div>Would be very very nice to have this
feature backported to OpenSIPS 3.6, being
it the last of the 3.X series, and an LTS</div>
<div><br>
</div>
<div>Please let's gather here your
thoughts , requests, corrections and
observations on this issue.</div>
<div><br>
</div>
<div>Have a nice Monday you all!</div>
<font style="color: rgb(136, 136, 136);">
<div><br>
</div>
<div>-giovanni</div>
</font></div>
<div><br>
</div>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">Sincerely,<br>
<br>
Giovanni Maruzzelli<br>
OpenTelecom.IT<br>
cell: +39 347 266 56 18<br>
<br>
</div>
</div>
<br>
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