<p>About 50% during testing, the SIP message including SDP during the relay of at least a 200 response to INVITE appears to be sending the original SIP message instead of the top-hidden version of the message.</p>
<p>Problem is more evident when rtpengine is used as well since the SDP has the wrong ports for RTP channels.</p>
<p>Due to corporate public IP addresses within PCAP and opensips log files, I've emailed the evidence for troubleshooting directly to Vlad Paiu for analysis.</p>
<p>Using topology_hiding("UC") call and rtp_engine flags of "replace-origin ICE=remove"</p>
<p>Example flow:<br>
Customer -> Opensips -> Vendor</p>
<p>"Opensips" is where topology_hiding, and rtpengine reside...</p>
<p>Example:<br>
INVITE from Customer w/SDP:</p>
<ul class="task-list">
<li>Customer sends INVITE with port 10000 to Opensips</li>
<li>Opensips performs top-hiding and rtpengine offer, relays INVITE with port 50000 to Vendor, and properly mangles the call-id header</li>
</ul>
<p>All the 100's and 180's go on as usual it appears.</p>
<p>200 Response from Vendor:</p>
<ul class="task-list">
<li>Vendor sends 200 OK with port 11000 to Opensips</li>
<li>Opensips sends 200 OK with port 11000 to Customer, and the original call-id value shows up</li>
</ul>
<p>The last line above is incorrect. Opensips SHOULD have sent port 50000 to the Customer. The entire SIP message is actually incorrect. This is evidenced easily by the Call-ID header not containing the mangled value.</p>
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