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<p class="MsoNormal"><span style="font-size:11.0pt">The issue here is not really with the uac_auth module, as that module isn’t sending the message only updating it with the correct authentication info.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">This is normal and correct behavior. When you send the message the second time using the same DNS, it will follow the same process as the first, trying A then timing out and failing over to B. Standard DNS
SRV doesn’t include any behavior to try to avoid non-responding nodes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Ultimately what you need is to know the actual IP that elicited the 401 so the next INVITE with the authentication can be sent to the same one, using $du or $dd(:$dp). Have you tried to get the remote IP in
onreply_route and store it is an AVP using $si [1] or $socket_in [2]? I don’t think I’ve ever used one of these in a reply route. The documentation doesn’t specify whether it is valid and they will contain the source of the reply, not the request.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">[1] - <a href="https://www.opensips.org/Documentation/Script-CoreVar-3-6#si">
https://www.opensips.org/Documentation/Script-CoreVar-3-6#si</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">[2] - <a href="https://www.opensips.org/Documentation/Script-CoreVar-3-6#socket_in">
https://www.opensips.org/Documentation/Script-CoreVar-3-6#socket_in</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Ben Newlin</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></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 nz deals <nzdealshelp@gmail.com><br>
<b>Date: </b>Thursday, May 29, 2025 at 9:32</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> </span><span style="font-size:12.0pt;color:black">AM<br>
<b>To: </b>OpenSIPS users mailling list <users@lists.opensips.org><br>
<b>Subject: </b>[OpenSIPS-Users] Issue with proxy failover and uac_auth()<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Calibri",sans-serif;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-family:Helvetica"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Hi All,</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Courier New"">I'm using OpenSIPS 3.4 and managing carrier trunks via the registrant table. In the table, I'm using a proxy value like sips:mysip.xx.x</span><o:p></o:p></p>
<p><span style="font-size:10.0pt;font-family:"Courier New"">When the primary carrier A sbc SRV record becomes unreachable, OpenSIPS correctly times out INVITE and attempts to fail over to the secondary A record (via SRV).</span><o:p></o:p></p>
<p><span style="font-size:10.0pt;font-family:"Courier New"">The secondary endpoint responds with a 401 Unauthorized and includes a WWW-Authenticate header. At this point, I assume that opensips should not try on the primary carrier A SRV record otherwise it
will also timeout. but it is trying to send another INVITE with Authorization to the primary. this timeout because primary A SRV record is not responding. opensips sends another INVITE to secondary and this time its without Authorization. </span><o:p></o:p></p>
<p><span style="font-size:10.0pt;font-family:"Courier New"">Is there any way to fix this or work around it? Has anyone faced a similar problem when using
<code>uac_auth()</code> in combination with failover and the same proxy domain? </span>
<o:p></o:p></p>
<p><span style="font-size:10.0pt;font-family:"Courier New"">Any advice or suggestions would be greatly appreciated.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Courier New"">Thank you</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Courier New"">Regards,</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Courier New"">Jason</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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