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<font face="monospace">Thank you Giovanni for starting this.<br>
<br>
So, the feature should focus on generating the PRACK requests.
Maybe this should be decoupled from the `100rel` management, as
this can be received or locally inserted. And you can easily do it
from script:<br>
<a class="moz-txt-link-freetext" href="https://opensips.org/html/docs/modules/3.6.x/sipmsgops.html#func_list_hdr_add_option">https://opensips.org/html/docs/modules/3.6.x/sipmsgops.html#func_list_hdr_add_option</a><br>
<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>
<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 11:46, Giovanni
Maruzzelli wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CALXCt0o5NsyQ2LZxBEzmqcit7TqPGcXwDX9_a+zkGnuWToyT0A@mail.gmail.com">
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<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" 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>
<fieldset class="moz-mime-attachment-header"></fieldset>
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