<p>It was noitced "branch=0" in sip-pinging requests, that seems not RFC compliant:</p>

<blockquote>
<p>OPTIONS sip:0004<em>202@192.168.5.61:5062 SIP/2.0.<br>
Via: SIP/2.0/UDP xxx.xxx.xxx.xxx:5060;branch=0.<br>
From: sip:<a href="mailto:ping@myhost.ru">ping@myhost.ru</a>;tag=uloc-5756b445-45e2-53b-223ff654-6ad81121.<br>
To: sip:0004</em>202@192.168.5.61:5062.<br>
Call-ID: <a href="mailto:935a5981-9d632e71-c6c3075@xxx.xxx.xxx.xxx">935a5981-9d632e71-c6c3075@xxx.xxx.xxx.xxx</a>.<br>
CSeq: 1 OPTIONS.<br>
Content-Length: 0.</p>
</blockquote>

<p>this issue is a google search result: <a href="https://github.com/OpenSIPS/opensips/issues/145" class="issue-link js-issue-link" data-url="https://github.com/OpenSIPS/opensips/issues/145" data-id="23579494" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">OpenSIPS/opensips#145</a><br>
so this patch is just a copy    of <a href="https://github.com/varunvairavan">varunvairavan</a> patch</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/kamailio/kamailio/pull/686'>https://github.com/kamailio/kamailio/pull/686</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>nathelper: set via branch according to "z9hG4bK..." format (instead of "branch=0")</li>
  <li>nat_traversal: set via branch according to "z9hG4bK..." format (instead of "branch=0")</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/686/files#diff-0">modules/nat_traversal/nat_traversal.c</a>
    (5)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/686/files#diff-1">modules/nathelper/sip_pinger.h</a>
    (16)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/kamailio/kamailio/pull/686.patch'>https://github.com/kamailio/kamailio/pull/686.patch</a></li>
  <li><a href='https://github.com/kamailio/kamailio/pull/686.diff'>https://github.com/kamailio/kamailio/pull/686.diff</a></li>
</ul>

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