<p></p>
<h3 dir="auto">Description</h3>
<p dir="auto">If the INVITE contains  <code class="notranslate">;ob</code> but no <code class="notranslate">;+sip.instance=xxxx;reg-id=N</code> then a flow-token is not added to the<br>
record-route header. This is contrary to RFC5626.</p>
<h4 dir="auto">Reproduction</h4>
<p dir="auto">Configure 2 x  kamailio according to module outbound; i.e 1 x edge proxy and 1 x internal proxy/registrar.</p>
<p dir="auto">UA1 and UA2 have already REGISTER'ed with <code class="notranslate">;+sip.instance=...;reg-id=...</code>.</p>
<pre class="notranslate"><code class="notranslate">UA1, UA2 --- edge proxy --- internal proxy
</code></pre>
<p dir="auto">Send INVITE from UA1 to UA2 with <code class="notranslate">;ob</code> but no other params:</p>
<pre class="notranslate"><code class="notranslate">Contact: <sip:user1250@192.168.12.45:5063;transport=TLS;ob>
Record-Route: <sip:127.0.0.1;r2=on;lr> 
Record-Route: <sip:192.168.13.50:5061;transport=tls;r2=on;lr>
</code></pre>
<p dir="auto">Observe that there is no flow-token added.</p>
<p dir="auto">Send INVITE from UA1 to UA2 with <code class="notranslate">;ob</code> with <code class="notranslate">;+sip.instance=...;reg-id=...</code>:</p>
<pre class="notranslate"><code class="notranslate">Contact: <sip:user1200@192.168.122.15;transport=tls;ob>;+sip.instance="<urn:uuid:0000
`0000-0000-0000-0000-0012341234>";reg-id=7
Record-Route: <sip:Jz0HaDIr1ZoqEAPAqA0yE8XAqAwqyAo=@127.0.0.1;r2=on;lr>
Record-Route: <sip:Jz0HaDIr1ZoqEAPAqA0yE8XAqAwqyAo=@192.168.13.50:5061;transport=tls;r2=on;lr>
</code></pre>
<p dir="auto">Observe that there is a flow-token added.</p>
<h4 dir="auto">Debugging Data</h4>
<h4 dir="auto">SIP Traffic</h4>
<h3 dir="auto">Possible Solutions</h3>
<h3 dir="auto">Additional Information</h3>
<p dir="auto">Version; kamailio 5.6.0</p>
<h4 dir="auto">RFC5626 Section 9.5</h4>
<p dir="auto"><a href="https://datatracker.ietf.org/doc/html/rfc5626#section-9.5" rel="nofollow">https://datatracker.ietf.org/doc/html/rfc5626#section-9.5</a></p>
<p dir="auto">INVITE must contain <code class="notranslate">ob;</code> but does not need to contain <code class="notranslate">;+sip.instance=...;reg-id=...</code></p>
<pre class="notranslate"><code class="notranslate">INVITE sip:alice@a.example SIP/2.0
   From: Bob <sip:bob@example.com>;tag=ldw22z
   To: Alice <sip:alice@a.example>
   Call-ID: 95KGsk2V/Eis9LcpBYy3
   CSeq: 1 INVITE
   Route: <sip:ep1.example.com;lr>
   Contact: <sip:bob@192.0.2.2;transport=tcp;ob>
</code></pre>
<p dir="auto">EP1 adds a Record-Route with a flow-token in message <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="54671899" data-permission-text="Title is private" data-url="https://github.com/kamailio/kamailio/issues/43" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/43/hovercard" href="https://github.com/kamailio/kamailio/issues/43">#43</a>.</p>
<pre class="notranslate"><code class="notranslate">Record-Route:   <sip:3yJEbr1GYZK9cPYk5Snocez6DzO7w+AX@ep1.example.com;lr>
</code></pre>

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