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<tt>Hi Giovanni,<br>
<br>
The CANCEL is hop-by-hop, which means each SIP hop will generate a
completely new CANCEL (to be sent further) - there is not
proxying, so the changes you do over the incoming CANCEL will not
propagate into the outgoing CANCEL.<br>
<br>
I cannot recall it, but is there a standard case of pushing ISUP
into CANCEL ?<br>
<br>
Best regards,<br>
</tt>
<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>
OpenSIPS Summit 2019
<a class="moz-txt-link-freetext" href="https://www.opensips.org/events/Summit-2019Amsterdam/">https://www.opensips.org/events/Summit-2019Amsterdam/</a>
</pre>
<div class="moz-cite-prefix">On 12/07/2018 02:00 PM, Giovanni
Maruzzelli wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CALXCt0qyWsjGNnxhisn7vUxZM-_ACL4gtkdPaOc44fs5t2WTnA@mail.gmail.com">
<div dir="ltr">
<div>Hi all,</div>
<div><br>
</div>
<div>using 2.4<br>
</div>
<div><br>
</div>
<div>I am trying to add_isup_part("Release"); to a CANCEL</div>
<div><br>
</div>
<div>It does not give errors (I use same isup_param(s) as per
BYE), but the CANCEL that is being sent out does not have the
isup part. <br>
</div>
<div>Eg, it does not even have a body, and Content-Length is 0.
<br>
</div>
<div><br>
</div>
<div>I suspect t_relay, when it recreate the CANCEL from the
original INVITE, does not care about what add_isup_part added
to the CANCEL (it makes sense, t_relay creates the CANCEL
anew, from original INVITE). <br>
</div>
<div><br>
</div>
<div>Any known workaround?</div>
<div><br>
</div>
<div>Using forward instead of t_relay sends a CANCEL with the
isup part, but remote reject it with 481 (call/transaction
does not exists), probably because is not routed exactly like
the initial INVITE, a branch parameter in a via header is
different...</div>
<div><br>
</div>
<div>-giovanni<br>
</div>
<br clear="all">
<br>
-- <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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</pre>
</blockquote>
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