<p></p>
<h3 dir="auto">Description</h3>
<p dir="auto">After I turned on topoh module, the forwarding call flow seems to break. This might be caused by the Contact header on Redirecting request is masked.</p>
<h3 dir="auto">Expected behavior</h3>
<p dir="auto">The Contact header in 301, 302 SIP message will not be masked, and the forward call will succeed.</p>
<h4 dir="auto">Actual observed behavior</h4>
<p dir="auto">The 302 SIP Contact header gets masked by 127.0.0.1 (masked_ip).</p>
<h4 dir="auto">SIP Traffic</h4>
<pre class="notranslate"><code class="notranslate">2022/10/05 13:47:58.093790 192.168.1.109:5060 -> 192.168.1.66:55709
SIP/2.0 302 Moved Temporarily
Via: SIP/2.0/TCP 192.168.1.66:58554;received=192.168.1.66;branch=z9hG4bK-524287-1---493db1f2d8f51001;rport=55709
Record-Route: <sip:127.0.0.1;line=sr-N6IAzBFsMJZfWBc7MmZfMxq-W.y6Mx1LMBu5oB1dNB1EpSthH.3sW6WBW.Vlz6aYgxuqMB37z.pBMP**>
Record-Route: <sip:192.168.1.109;transport=tcp;r2=on;lr;ftag=697cc523;did=d26.97c1>
From: <sip:1000@192.168.1.109;transport=TCP>;tag=697cc523
To: <sip:1001@192.168.1.109>;tag=1357659545
Call-ID: g_hnmT8yukR7M9QxI-t6jA..
CSeq: 2 INVITE
Contact: <sip:127.0.0.1;line=sr-N6IAzBj6M.KyM.qLOBF6zGZfOBF6W.vuMxNA>
Supported: replaces, path, timer
User-Agent: Grandstream GXP1620 1.0.4.106
Diversion: <sip:1001@192.168.1.165:5070>;reason=unconditional
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE, MESSAGE
Content-Length: 0
</code></pre>
<h3 dir="auto">Possible Solutions</h3>
<p dir="auto">The behavior becomes normal when I turn off the topoh module.<br>
Hence, I think this can be solved by retaining the Contact header for 301, 302 requests when using topoh.</p>
<h3 dir="auto">Additional Information</h3>
<ul dir="auto">
<li><strong>Kamailio Version</strong> - output of <code class="notranslate">kamailio -v</code></li>
</ul>
<pre class="notranslate"><code class="notranslate">kamailio 5.4.5
</code></pre>
<ul dir="auto">
<li><strong>Operating System</strong>:</li>
</ul>
<pre class="notranslate"><code class="notranslate">Centos 7
</code></pre>
<p dir="auto"><a href="https://github.com/kamailio/kamailio/files/9714508/topoh_302.tar.gz">topoh_302.tar.gz</a></p>

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