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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>
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<div dir="ltr">For the rest, I think that your approach is complete.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"><b>Van:</b> Users <users-bounces@lists.opensips.org> namens Bogdan-Andrei Iancu <bogdan@opensips.org><br>
<b>Verzonden:</b> maandag, januari 12, 2026 5:06 PM<br>
<b>Aan:</b> gmaruzz@opentelecom.it <gmaruzz@opentelecom.it><br>
<b>CC:</b> OpenSIPS users mailling list <users@lists.opensips.org><br>
<b>Onderwerp:</b> Re: [OpenSIPS-Users] PRACK interworking requirements
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<font face="monospace">Hey all and A Happy New Year !<br>
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Pocking again the topic.... based on the discussion, I see two approached (they do not exclude one each other):<br>
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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>
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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>
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Does this sound like a plan ?<br>
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Regards,<br>
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<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 25.11.2025 13:14, Giovanni Maruzzelli wrote:<br>
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<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">bogdan@opensips.org</a>> wrote:</div>
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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>
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<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>
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<div dir="auto">-giovanni</div>
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<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">https://www.opensips-solutions.com</a>
<a href="https://www.siphub.com" target="_blank" rel="noreferrer" class="moz-txt-link-freetext">https://www.siphub.com</a></pre>
<div>On 25.11.2025 11:46, Giovanni Maruzzelli wrote:<br>
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<div>hello OpenSIPSers,</div>
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<div>in previous mails has been noticed that various ITSPs are starting to require PRACK support.</div>
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<div>We know that PRACK belongs to endpoints, specifically phones and B2BUAs.</div>
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<div>But...</div>
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<div>There can be a use case where OpenSIPS will work as SBC (not necessarily using the b2b module)</div>
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<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>
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<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>
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<div>Reference RFC: <a href="https://www.ietf.org/rfc/rfc3262.txt" target="_blank" rel="noreferrer" class="moz-txt-link-freetext">https://www.ietf.org/rfc/rfc3262.txt</a></div>
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<div>I believe this will be enough to make ITSPs happy.</div>
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<div>Further developments can be moved to future.</div>
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<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>
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<div>Please let's gather here your thoughts , requests, corrections and observations on this issue.</div>
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<div>Have a nice Monday you all!</div>
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<div>-giovanni</div>
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<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">Sincerely,<br>
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Giovanni Maruzzelli<br>
OpenTelecom.IT<br>
cell: +39 347 266 56 18<br>
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