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<p class="MsoNormal">Johan,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I think you must have left some pieces out of your initial description then. You stated that node A is sending directly to your OpenSIPS node, so the source IP and Via would both point to node A.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As I mentioned, changes to Contact and Record-Route headers will only affect the routing of sequential requests for the dialog. They will not impact the routing of responses. I don’t think that OpenSIPS provides any mechanism to change
the destination of responses it proxies, since as you said this is outside of the RFC.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:black">Ben Newlin</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Users <users-bounces@lists.opensips.org> on behalf of Johan De Clercq <johan@democon.be><br>
<b>Date: </b>Saturday, October 7, 2023 at 1:40 AM<br>
<b>To: </b>OpenSIPS users mailling list <users@lists.opensips.org><br>
<b>Subject: </b>Re: [OpenSIPS-Users] on routing invite's in a trunk context.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:#B60000"> EXTERNAL EMAIL - Please use caution with links and attachments <o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal">It’s a very non rfc scenario. Source ip and via are the ip of a loadbalancer that I need to skip …. ;-(. The contact does have the correct ip. Anyway, you gave me a good hint. I will add the contact ip as record route and see what that
gives.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Verzonden vanuit <a href="https://aka.ms/o0ukef">
Outlook voor iOS</a><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="color:black">Van:</span></b><span style="color:black"> Users <users-bounces@lists.opensips.org> namens Ben Newlin <Ben.Newlin@genesys.com><br>
<b>Verzonden:</b> Friday, October 6, 2023 5:35:40 PM<br>
<b>Aan:</b> OpenSIPS users mailling list <users@lists.opensips.org><br>
<b>Onderwerp:</b> Re: [OpenSIPS-Users] on routing invite's in a trunk context.</span>
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<p class="xmsonormal"><span style="font-size:11.0pt">Johan,</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt">This is actually a pretty standard SIP flow that we use all the time. I recommend this article [1] for an overview of how routing works in SIP.
</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt">In short, the Contact and Record-Route headers are only used for routing of requests not responses, and mostly only sequential requests which are requests within a dialog. The topology_hiding_match and loose_route
functions both operate on requests only, so they can both only be called from a request_route [1] [2].</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt">The 200 OK is a response within the initial INVITE transaction. Responses within a SIP transaction are routed based on the source IP of request and/or the Via headers. OpenSIPS should just handle that for
you, unless you have some strange routing.</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt">[1] <a href="https://kb.smartvox.co.uk/opensips/contact-and-record-route-headers-explained/">
https://kb.smartvox.co.uk/opensips/contact-and-record-route-headers-explained/</a></span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt">[2] <a href="https://opensips.org/docs/modules/3.2.x/topology_hiding.html#func_topology_hiding_match">
https://opensips.org/docs/modules/3.2.x/topology_hiding.html#func_topology_hiding_match</a></span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt">[3] <a href="https://opensips.org/docs/modules/3.2.x/rr.html#func_loose_route">
https://opensips.org/docs/modules/3.2.x/rr.html#func_loose_route</a></span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-size:11.0pt;color:black">Ben Newlin</span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="xmsonormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Users <users-bounces@lists.opensips.org> on behalf of johan <johan@democon.be><br>
<b>Date: </b>Friday, October 6, 2023 at 10:30 AM<br>
<b>To: </b>OpenSIPS users mailling list <users@lists.opensips.org><br>
<b>Subject: </b>[OpenSIPS-Users] on routing invite's in a trunk context.</span><o:p></o:p></p>
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<p class="xmsonormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt"> EXTERNAL EMAIL - Please use caution with links and attachments <br>
<br>
This is a general question on routing (to be honest: it is a really <br>
strange case).<br>
<br>
<br>
A has a sip trunk to B (opensips), B has a sip trunk to C<br>
<br>
<br>
<br>
A sends an invite to B with contact header A' and record-route header <br>
to A''<br>
<br>
B string the record_route header , calls topology hiding and droutes the <br>
call to C<br>
<br>
C sends 200 OK back but it needs to be routed on the content of the <br>
contact header.<br>
<br>
<br>
Now how does this route to A ? Is this the default <br>
topology_hiding_match() case ? Or do I need to do something special ?<br>
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