I still havent made much progress with the new SIP connection helper. I started to do an more detailed analysis by setting all rules to log all and then look at the results to see where the traffic was breaking down. No SIP traffic is appearing in the packet filter logs, and the SIP log remains empty. I will post as I find more information, but generally speaking if I switch to the v6 firewall in transparent mode - all is good. TFTP of the configuration is successful to the device, but no SIP traffic is moving. Disabling the SIP connection helper yields a registration with the wrong (internal IP), enabling yields a null result.