<p>See here two screenshots from Wireshark. The capture was made on one interface on the internal proxy <code>10.x.x.x</code>. When it's receiving a SIP packet from another host in the same subnet, everything is working normally.</p>
<p><a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/5112477/47913358-185fdc00-de9c-11e8-9331-60a9432c9a89.png"><img src="https://user-images.githubusercontent.com/5112477/47913358-185fdc00-de9c-11e8-9331-60a9432c9a89.png" alt="kamailio_issue_1703_1_normal" style="max-width:100%;"></a></p>
<p>But when it's receiving a SIP packet from a public subnet, then it's just ignoring the packet completely.</p>
<p><a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/5112477/47913363-1dbd2680-de9c-11e8-9360-a650f60602c0.png"><img src="https://user-images.githubusercontent.com/5112477/47913363-1dbd2680-de9c-11e8-9360-a650f60602c0.png" alt="kamailio_issue_1703_2_no_response" style="max-width:100%;"></a></p>

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