On Sep 30, 2022, at 3:55 AM, Denys Pozniak &lt;denys.pozniak(a)gmail.com <mailto:denys.pozniak@gmail.com>> wrote: Hello! I also met a similar case and I had to manually handle this behavior. It is likely that the loose_route() function has determined that you have a strict routing scenario. But then, in theory, RURI should have its own domain, which is not visible in your trace. чт, 29 сент. 2022 г. в 14:40, Mack Hendricks &lt;mack(a)dopensource.com <mailto:mack@dopensource.com>>: Hey All, I always struggle with loose_route() and I implemented workarounds in the past. But, I want to get a better understanding. I have a SIP Endpoint -> Kamailio -> FreeSWITCH The domain and alias is set to the ip address of the Kamailio server (137.184.130.206) When I get the ACK back from the SIP Endpoint it looks like this ACK sip:18889072085@137.184.72.42:5060;transport=udp <sip:18889072085@137.184.72.42:5060;transport=udp> SIP/2.0 Via: SIP/2.0/UDP 10.1.10.140:1052;branch=z9hG4bK-524287-1---740db0025fa217ce;rport Max-Forwards: 70 Route: <sip:137.184.130.206;lr <sip:137.184.130.206;lr>> Contact: <sip:1000@50.192.97.226:53790;transport=UDP <sip:1000@50.192.97.226:53790;transport=UDP>> To: <sip:18889072085@dsiptest.dsiprouter.net <mailto:sip%3A18889072085@dsiptest.dsiprouter.net>>;tag=5gv4etZ8tUUcH From: <sip:1000@dsiptest.dsiprouter.net <mailto:sip%3A1000@dsiptest.dsiprouter.net>;transport=UDP>;tag=0af5b751 Call-ID: fWido7VIUKIEI6f6kf4vkQ.. CSeq: 1 ACK User-Agent: Z 5.5.8 v2.10.17.2 Content-Length: 0 Kamailio will then remove the ACK and change the RURI to itself, which causes an ACK loop. This is what is look like ACK sip:137.184.130.206;lr <sip:137.184.130.206;lr> SIP/2.0 Via: SIP/2.0/UDP 137.184.130.206;branch=z9hG4bK3fd.0cf34b683f0627ee2455594ea6cb2517.0 Via: SIP/2.0/UDP 10.1.10.140:1052;received=50.192.97.226;branch=z9hG4bK-524287-1---740db0025fa217ce;rport=1052 Max-Forwards: 69 Contact: <sip:1000@50.192.97.226:1052;transport=UDP <sip:1000@50.192.97.226:1052;transport=UDP>> To: <sip:18889072085@dsiptest.dsiprouter.net <mailto:sip%3A18889072085@dsiptest.dsiprouter.net>>;tag=5gv4etZ8tUUcH From: <sip:1000@dsiptest.dsiprouter.net <mailto:sip%3A1000@dsiptest.dsiprouter.net>;transport=UDP>;tag=0af5b751 Call-ID: fWido7VIUKIEI6f6kf4vkQ.. CSeq: 1 ACK User-Agent: Z 5.5.8 v2.10.17.2 Content-Length: 0 Question: What am I missing here? We have the alias set and we even set it in the domain module (with the register_myself flag). We have workarounds for this, but I would prefer to figure out how to have Kamailio handle this natively via the loose_route or tm module. Thanks in advance, __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users(a)lists.kamailio.org <mailto:sr-users@lists.kamailio.org> Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users <https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users> -- BR, Denys Pozniak __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users(a)lists.kamailio.org <mailto:sr-users@lists.kamailio.org> Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users <https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users>