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Rahul,<br>
<br>
As per RFC, in stateless mode there is no branch (for the newly
added VIA) - as branch is transaction oriented. And the RFC3261
recommends to reuse the previous VIA hdr (if exists).<br>
<br>
Regards,<br>
<br>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a></pre>
<div class="moz-cite-prefix">On 07.05.2015 20:01, Gupta, Rahul
wrote:<br>
</div>
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<p class="MsoNormal"><span style="color:#1F497D">Hi Bogdan,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I want to use
opensips as stateless proxy that’s why I tried forward()
which is causing the branch issue as shown below, the
branch in both the Via headers are same.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">CANCEL
sip:XXXX@IP:PORT SIP/2.0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">From: "Alan
Altman[3004]"<sip:YYYY@IP:PORT>;tag=389cc678-0-13c4-65014-16288-3d1c9b70-16288<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">To:
<sip:XXXX@IP:PORT><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Call-ID:
10589b68-0-13c4-65014-16288-156334b2-16288<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">CSeq: 1 CANCEL<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Via:
SIP/2.0/UDP
IP:PORT;branch=z9hG4bK-16288-568e507-60d8e02-38903830<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Via:
SIP/2.0/UDP
IP:PORT;branch=z9hG4bK-16288-568e507-60d8e02-38903830<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Reason:
SIP;cause=200;text="User Release"<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Max-Forwards:
69<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Supported:
timer,replaces,from-change,histinfo,answermode,eventlist,recipient-list-subscribe<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">User-Agent:
test user agent<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Content-Length:
0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">X-testHeader:
RAHUL<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If we use
t_relay(), I want to forward X-testHeader to the endpoint.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
Bogdan-Andrei Iancu [<a class="moz-txt-link-freetext" href="mailto:bogdan@opensips.org">mailto:bogdan@opensips.org</a>]
<br>
<b>Sent:</b> Thursday, May 07, 2015 12:39 PM<br>
<b>To:</b> OpenSIPS users mailling list; Gupta, Rahul<br>
<b>Subject:</b> Re: [OpenSIPS-Users] CANCEL in t_relay()
not forwarding user defined Headers<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><tt><span style="font-size:10.0pt">Hi
Rahul,</span></tt><span
style="font-size:10.0pt;font-family:"Courier New""><br>
<br>
<tt>As per RFC3261, the stateful CANCELs are hop-by-hop -
which means each hop consumes the incoming CANCEL and
generates a new one for the next hop.</tt><br>
<tt>This is why the headers do not propagate.</tt><br>
<br>
<tt>What kind of headers are looking to be passed further ?</tt><br>
<br>
<tt>Regards,</tt><br>
<br>
</span><o:p></o:p></p>
<pre>Bogdan-Andrei Iancu<o:p></o:p></pre>
<pre>OpenSIPS Founder and Developer<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a><o:p></o:p></pre>
<div>
<p class="MsoNormal">On 06.05.2015 20:45, Gupta, Rahul wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif";background:white">I
am using opensips as a proxy, when a CANCEL to an INVITE
comes in, its processed as follows<span
class="apple-converted-space"> </span></span><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif""><br>
<br>
<span style="background:white"> # CANCEL processing<span
class="apple-converted-space"> </span></span><br>
<span style="background:white"> if
(is_method("CANCEL"))<span class="apple-converted-space"> </span></span><br>
<span style="background:white"> {<span
class="apple-converted-space"> </span></span><br>
<span style="background:white"> if
(t_check_trans())<span class="apple-converted-space"> </span></span><br>
<span style="background:white">
t_relay();<span class="apple-converted-space"> </span></span><br>
<span style="background:white"> exit;<span
class="apple-converted-space"> </span></span><br>
<span style="background:white"> }<span
class="apple-converted-space"> </span></span><br>
<br>
<span style="background:white">in t_relay() seems like its
creating new transaction for CANCEL and forwarding to
the destination. However its not copying user-defined
Headers which comes as a part of CANCEL. Is there a way
to forward the other Headers ?<span
class="apple-converted-space"> </span></span><br>
<br>
<span style="background:white">I also tried using
forward(). In this case, all the headers are getting
forwarded, however, the branch in Via header is getting
duplicated from the incoming VIA header which is causing
issues with the endpoint.<span
class="apple-converted-space"> </span></span><br>
<br>
<span style="background:white">Question 1) If I use
t_realy() for CANCEL, then how do I forward user defined
Headers ?<span class="apple-converted-space"> </span></span><br>
<span style="background:white">Question 2) If I use
forward() for CANCEL, then how do I get the Via Header
with proper branch as created in INVITE ?<span
class="apple-converted-space"> </span></span></span><o:p></o:p></p>
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<br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Users mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a><o:p></o:p></pre>
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style="font-size:12.0pt;font-family:"Times New
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