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<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">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>
</div>
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cite="mid:CALXCt0odxGKZqZ3BEFgztDjAXY3_0JG+PKwA-Kc0y7KXUtBXyg@mail.gmail.com">
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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"
moz-do-not-send="true" class="moz-txt-link-freetext">bogdan@opensips.org</a>>
wrote:</div>
<blockquote class="gmail_quote"
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<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>
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<div dir="auto"><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>
<div dir="auto"><br>
</div>
<div dir="auto">-giovanni</div>
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<blockquote class="gmail_quote"
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<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" moz-do-not-send="true"
class="moz-txt-link-freetext">https://www.opensips-solutions.com</a>
<a href="https://www.siphub.com" target="_blank" rel="noreferrer"
moz-do-not-send="true" 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>
<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"
moz-do-not-send="true"
class="moz-txt-link-freetext">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 color="#888888">
<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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