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<tt>Hi Rahul,<br>
<br>
The re<tt>ceived VIA hdr (with the .44 IP) is <tt>properly p<tt>reserved
when forwarding (in the outbound message).<br>
<br>
<tt>The VIA hdr added by O<tt>pen<tt>SIPS ( .156 IP) is a
completely new VIA a<tt>nd its b<tt>ranch <tt>value
is <tt>completely</tt> <tt>independent</tt>
from the <tt>branch</tt> <tt>of other VIA
hdrs.<br>
<br>
<tt>Why <tt>do they look the sa<tt>me ? <tt>The
RFC3261 says that <tt>for stateless
fw<tt>d (when basically there is no
transaction, so no branch value),
to avoid <tt>populating <tt>its</tt>
<tt>VIA with ";branch=0" , </tt></tt>the
pro<tt>xy <tt>may</tt><tt> "copy"
and use a branch value <tt>from
an older VIA (a received
VIA)<tt> - ke<tt>ep in mind
i<tt>t does not say to c<tt>opy
it <tt>entirely or
part. So<tt>,
OpenSIPS copies
<tt>a
MAX_BRANCH_PARAM_LEN
<tt>length
string from
the previous <tt>branch
param.<br>
<br>
<tt>Everything
is correct and
lega<tt>l
(from RFC
perspecti<tt>ve).</tt></tt></tt></tt></tt>
<br>
<br>
<tt>PS: if you
would us<tt>e
t_relay<tt>()
instead <tt>of
for<tt>ward<tt>()
- doing
statefull <tt>proxy
<tt>-, you
will see that
the branch in
the VIA added
by OpenSIPS <tt>will
be complet<tt>ly
di<tt>fferent
from the value
in the <tt>previous
VIA.</tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt>
</tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt><br>
</tt></tt></tt></tt></tt></tt></tt></tt></tt></tt><br>
<tt>Best re<tt>gards,</tt></tt><br>
</tt>
<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 07.07.2016 03:42, Gupta, Rahul
wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
Bogdan,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Here
is a Ethernet trace (pcap) file that has a successful and an
unsuccessful registration.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Frames
1-8 illustrate the successful case with Frames 2 and 6 show
how opensips adds an extra VIA header that has a full
VIA;branch<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Frame:2<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Via:
SIP/2.0/UDP
10.204.70.156:5060;branch=z9hG4bK-c45d6-2ff0ce63-4583dc45-6bd144f8<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Via:
SIP/2.0/UDP
10.204.45.122:5060;branch=z9hG4bK-c45d6-2ff0ce63-4583dc45-6bd144f8<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Frames
9-16 illustrate the unsuccessful case where Frames 10 and 14
show how opensips adds an extra VIA header that has a
truncated branch.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Frame
10:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Via:
SIP/2.0/UDP
10.204.70.156:5060;branch=z9hG4bK1c68e33e-848e-412a-9137-4fb065a7b7eb_0efbfc5e_11391<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Via:
SIP/2.0/UDP
10.205.236.44:5060;branch=z9hG4bK1c68e33e-848e-412a-9137-4fb065a7b7eb_0efbfc5e_11391</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:red;background:yellow;mso-highlight:yellow">5620064228_MTAuMTIuMy4xMQ</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"
style="margin-bottom:3.0pt;page-break-after:avoid"><b><span
style="font-size:11.0pt;font-family:"Calibri
Light","sans-serif";color:#1F4E79"
lang="EN-GB">Thanks<o:p></o:p></span></b></p>
<p class="MsoNormal"
style="margin-bottom:3.0pt;page-break-after:avoid"><b><span
style="font-size:11.0pt;font-family:"Calibri
Light","sans-serif";color:#1F4E79"
lang="EN-GB">Rahul Gupta</span></b><b><span
style="font-size:11.0pt;font-family:"Calibri
Light","sans-serif";color:#1F4E79"
lang="EN-GB"><o:p></o:p></span></b></p>
<p class="MsoNormal"
style="margin-bottom:6.0pt;page-break-after:avoid"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79"
lang="EN-GB">Systems Architect</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79"
lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="FR">T</span></b><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="FR"> +1 732-690-3845
</span><span
style="font-size:10.0pt;font-family:Symbol;color:#5B9BD5">|</span><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="FR">
<b>E</b> <a moz-do-not-send="true"
href="mailto:rahul.gupta@ipc.com"><span
style="color:#0563C1">rahul.gupta@ipc.com</span></a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><img
id="Picture_x0020_2"
src="cid:part2.02000602.03050509@opensips.org"
alt="cid:image006.jpg@01D1940F.3E021840" height="68"
width="163" border="0"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri","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> Wednesday, July 06, 2016 5:38 AM<br>
<b>To:</b> OpenSIPS users mailling list<br>
<b>Cc:</b> Elliott, Ray; Gupta, Rahul<br>
<b>Subject:</b> Re: [OpenSIPS-Users] Truncated Branch in
Via<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>That define is used to calculate the the max VIA len
when OpenSIPS is generating its own VIA headers. That max
len does not impact the VIA headers which were received.</tt><br>
<br>
<tt>I do not understand exactly (in your example) what's the
flow of that VIA header. If you want, send me off-list the
pcap/ngrep showing the SIP package (before and after
OpenSIPS) and how it is affected.</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 05.07.2016 20:57, Gupta, Rahul wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">We
are using opensips 1.11.5 as a stateless proxy and
seeing a truncated Branch in Via for my REGISTER
message. After some code digging, the MAX length is
calculated using the following formula and seems like
its truncating the branch after 55 characters. This is
causing the REGISTER to fail in our case. Is there a
config level solution to this ?<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">#define
MAX_BRANCH_PARAM_LEN (MCOOKIE_LEN+8 /*!<int2hex*/
+ 1 /*sep*/ + \</span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">
MD5_LEN + 1 /*!<sep*/ + 8 /*int2hex*/ + \</span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">
1 /*extra space, needed by t_calc_branch*/)</span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">truncated
from opensips
</span><span
style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">ą</span><span
style="font-size:11.0pt;color:#1F497D"> </span><span
style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Via:
SIP/2.0/UDP
XX.XX.XX.XX:5060;branch=z9hG4bK0fddbbc9-1487-4755-a0b3-0c319155b8c3_0efbfc5e_11160 </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Via
from EndPoint </span><span
style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">ą</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
Via: SIP/2.0/UDP
XX.XX.XX.XX:5060;branch=z9hG4bK0fddbbc9-1487-4755-a0b3-0c319155b8c3_0efbfc5e_11160<span
style="background:yellow">78308924346_MTAuMTIuMy4xMQ</span> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
</div>
<div style="margin-bottom:3.0pt">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri
Light","sans-serif";color:#1F4E79">Thanks</span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div style="margin-bottom:3.0pt">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri
Light","sans-serif";color:#1F4E79">Rahul
Gupta</span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
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<br>
<br>
<o:p></o:p></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>
</blockquote>
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