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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Bogdan, so the problem we are facing is the endpoint has a new branch however the difference in the branch value is
<b>AFTER</b> the MAX_BRANCH_PARAM_LEN, the highlighted text.</span><tt><span style="font-size:10.0pt"> S</span></tt><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">ince opensips is copying the partial branch which is same as
the previous Via and thus our SIP stack (OCCAS) is sending back 401 Unauthorized for both thinking it’s a retransmit.
<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">This is also in line with RFC3261. Shouldn’t it copy the entire Via to make sure it’s different from previous Message ?<o:p></o:p></span></p>
<p class="MsoNormal"><tt><span style="font-size:10.0pt"><o:p> </o:p></span></tt></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">REGISTER 1<o:p></o:p></span></b></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_1139156<span style="background:yellow;mso-highlight:yellow">20064228</span>_MTAuMTIuMy4xMQ<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"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">REGISTER 2<o:p></o:p></span></b></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_1139156<span style="background:yellow;mso-highlight:yellow">56050004</span>_MTAuMTIuMy4xMQ</span><tt><span style="font-size:10.0pt"><o:p></o:p></span></tt></p>
<p class="MsoNormal"><tt><span style="font-size:10.0pt"><o:p> </o:p></span></tt></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 lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri Light","sans-serif";color:#1F4E79">Thanks<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-bottom:3.0pt;page-break-after:avoid"><b><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri Light","sans-serif";color:#1F4E79">Rahul Gupta</span></b><b><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri Light","sans-serif";color:#1F4E79"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-bottom:6.0pt;page-break-after:avoid"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79">Systems Architect</span><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="FR" style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D">T</span></b><span lang="FR" style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> +1 732-690-3845
</span><span style="font-size:10.0pt;font-family:Symbol;color:#5B9BD5">|</span><span lang="FR" style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
<b>E</b> <a 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 border="0" width="163" height="68" id="_x0000_i1026" src="cid:image001.jpg@01D1D85F.85DB2780" alt="cid:image006.jpg@01D1940F.3E021840"><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 [mailto:bogdan@opensips.org]
<br>
<b>Sent:</b> Thursday, July 07, 2016 4:43 AM<br>
<b>To:</b> Gupta, Rahul<br>
<b>Cc:</b> Elliott, Ray; users@lists.opensips.org<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>The received VIA hdr (with the .44 IP) is properly preserved when forwarding (in the outbound message).</tt><br>
<br>
<tt>The VIA hdr added by OpenSIPS ( .156 IP) is a completely new VIA and its branch value is completely independent from the branch of other VIA hdrs.</tt><br>
<br>
<tt>Why do they look the same ? The RFC3261 says that for stateless fwd (when basically there is no transaction, so no branch value), to avoid populating its VIA with ";branch=0" , the proxy may "copy" and use a branch value from an older VIA (a received VIA)
- keep in mind it does not say to copy it entirely or part. So, OpenSIPS copies a MAX_BRANCH_PARAM_LEN length string from the previous branch param.</tt><br>
<br>
<tt>Everything is correct and legal (from RFC perspective). </tt><br>
<br>
<tt>PS: if you would use t_relay() instead of forward() - doing statefull proxy -, you will see that the branch in the VIA added by OpenSIPS will be completly different from the value in the previous VIA.
</tt><br>
<br>
<tt>Best 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 href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a><o:p></o:p></pre>
<div>
<p class="MsoNormal">On 07.07.2016 03:42, 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:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Bogdan,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></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.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></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</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Frame:2</span><o:p></o:p></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</span><o:p></o:p></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</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></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.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Frame 10:</span><o:p></o:p></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</span><o:p></o:p></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><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:3.0pt;page-break-after:avoid"><b><span lang="EN-GB" style="font-size:11.0pt">Thanks</span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:3.0pt;page-break-after:avoid"><b><span lang="EN-GB" style="font-size:11.0pt">Rahul Gupta</span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:6.0pt;page-break-after:avoid"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79">Systems Architect</span><o:p></o:p></p>
<p class="MsoNormal"><b><span lang="FR" style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D">T</span></b><span lang="FR" style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> +1 732-690-3845
</span><span style="font-size:10.0pt;font-family:Symbol;color:#5B9BD5">|</span><span lang="FR" style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
<b>E</b> <a href="mailto:rahul.gupta@ipc.com"><span style="color:#0563C1">rahul.gupta@ipc.com</span></a>
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><img border="0" width="163" height="68" id="Picture_x0020_2" src="cid:image003.png@01D1D860.64EDEF70" alt="cid:image006.jpg@01D1940F.3E021840"></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></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 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</span><o:p></o:p></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>
<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 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 ?</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><o:p></o:p></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">à</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><o:p></o:p></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">à</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><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><o:p></o:p></p>
</div>
<div style="margin-bottom:3.0pt">
<p class="MsoNormal"><b><span style="font-size:11.0pt">Thanks</span></b><o:p></o:p></p>
</div>
<div style="margin-bottom:3.0pt">
<p class="MsoNormal"><b><span style="font-size:11.0pt">Rahul Gupta</span></b><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><o:p></o:p></p>
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replicated on other systems, or may be intercepted, deleted or interfered with without the knowledge of the sender or the intended recipient. If you are not comfortable with the risks associated with e-mail messages, you may decide not to use e-mail to communicate
with IPC. IPC reserves the right, to the extent and under circumstances permitted by applicable law, to retain, monitor and intercept e-mail messages to and from its systems.
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<pre>_______________________________________________<o:p></o:p></pre>
<pre>Users mailing list<o:p></o:p></pre>
<pre><a href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a><o:p></o:p></pre>
<pre><a 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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