<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Hello,<br>
<br>
<div class="moz-cite-prefix">On 5/23/12 5:22 PM, Vitaliy Aleksandrov
wrote:<br>
</div>
<blockquote cite="mid:4FBD00CB.7050304@gmail.com" type="cite">
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
Hi all,<br>
<br>
I have a question about CANCEL message processing.<br>
<br>
My call sceraio:<br>
When an INVITE request comes I need to rewrite a domain part of
the several headers(to, from, contact, SDP ip) according to the
outgoing interface.<br>
I can do it before t_relay(), but when destination user has more
then one locations and they are reachable through different
interfaces all forked INVITEs will have the same domain.<br>
To avoid that problem i have tried to move rewriting part(subst
from the textops module) to the branch_route.<br>
<br>
Unfortunately that solution didn't helped me, because "To" header
of the outgoing CANCEL messages is wrong (unchanged. as it was at
the moment when transaction was created by the t_relay() ).<br>
As i understood from the documentation and mailing list kamailio
builds CANCEL based on outgoing INVITE.<br>
<br>
I did a small research and found that Kamailio really takes
outgoing INVITE from each branch (invite_transaction_cell ->
uac[b_id].request.buffer) and builds CANCEL (build_local_reparse()
from tm/t_msgbuilder.c) based on it.<br>
But kamailio does an exception for the To header which is
described below:<br>
<b> </b><b>cancel_branch</b> function (from t_cancel.c) calls
<b>build_local_reparse</b>() and fills one of the parameters with
a pointer to unmodified To header.<br>
<b> build_local_reparse</b>() uses received To header to
construct outgoing CANCEL.<br>
<br>
I have changed:<br>
cancel = build_local_reparse(t, branch, &len, CANCEL,
CANCEL_LEN, &t->to, reason);<br>
to:<br>
cancel = build_local_reparse(t, branch, &len, CANCEL,
CANCEL_LEN, NULL, reason);<br>
and it works for me now.<br>
<br>
It looks like if E2E_CANCEL_HOP_BY_HOP <b>e2e_cancel()</b>
(t_fwd.c) will call <b>e2e_cancel_branch()</b> which works as i
want instead of <b>cancel_branch()</b>, but it is just my
assumption.<br>
</blockquote>
<br>
do you mean if E2E_CANCEL_HOP_BY_HOP is defined? I quick grep at
this time showed it is defined in t_fwd.h...<br>
<br>
What is the version you are using?<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<blockquote cite="mid:4FBD00CB.7050304@gmail.com" type="cite"> <br>
Why does kamailio generate CANCEL requests in such a way ? Did i
miss something from the RFC3261 or kamailio documentation ?<br>
<br>
Thanks in advance for any help !<br>
<br>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:sr-users@lists.sip-router.org">sr-users@lists.sip-router.org</a>
<a class="moz-txt-link-freetext" href="http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users">http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users</a>
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla - <a class="moz-txt-link-freetext" href="http://www.asipto.com">http://www.asipto.com</a>
<a class="moz-txt-link-freetext" href="http://twitter.com/#!/miconda">http://twitter.com/#!/miconda</a> - <a class="moz-txt-link-freetext" href="http://www.linkedin.com/in/miconda">http://www.linkedin.com/in/miconda</a></pre>
<br>
<br>
</body>
</html>