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These were all phones registered to the internal SIP profile with no NAT in between. If I examined the UDP packets the header ip and port matched the SIP via and contact headers, but of course these were all RFC1918 addresses (which, for me, doesn't necessarily cause the status to go to...

Thanks... I have upgraded my Freeswith / FusionPBX install and so far everything seems to be on UDP.

I'm running FusionPBX in a lxc container with wireguard on the host and all clients also connect through the wireguard vpn. There is no NAT between the clients and the FusionPBX container, however some clients switch from "Registered UDP" to "Registered UDP-NAT" or even "Registered AUTO-NAT-2.0"...