<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>note that we currently have
<a class="moz-txt-link-freetext" href="https://opensips.org/html/docs/modules/3.6.x/dialog.html#func_dlg_send_sequential">https://opensips.org/html/docs/modules/3.6.x/dialog.html#func_dlg_send_sequential</a>
, it can be used to generate a PRACK ( you'll have to manually add
the Rseq header), but it's not working properly if the upstream
has multiple TO-TAGS that are ringing ( it will always generate to
the newest learnt to-tag, and there's also some quirks with CSEQ
mapping ), so perhaps the 'manual' approach would be getting
dlg_send_sequential to work properly for generating early requests
( with PRACK being a rather specific use-case due to it's
cseq/rseq stuff )</p>
<div class="moz-cite-prefix">On 11/25/25 13:14, Giovanni Maruzzelli
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CALXCt0odxGKZqZ3BEFgztDjAXY3_0JG+PKwA-Kc0y7KXUtBXyg@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<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"
moz-do-not-send="true" class="moz-txt-link-freetext">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" 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>
</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"
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></fieldset>
<pre>_______________________________________________
Users mailing list
<a href="mailto:Users@lists.opensips.org" target="_blank"
rel="noreferrer" moz-do-not-send="true"
class="moz-txt-link-freetext">Users@lists.opensips.org</a>
<a href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users"
target="_blank" rel="noreferrer" moz-do-not-send="true"
class="moz-txt-link-freetext">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a>
</pre>
</blockquote>
<br>
</div>
</blockquote>
</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre wrap="" class="moz-quote-pre">_______________________________________________
Users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a>
<a class="moz-txt-link-freetext" href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a>
</pre>
</blockquote>
</body>
</html>