See this is the problem.
For some reason the spa-112 won’t go outside it’s own subnet.
So the device has a 172.29.0.9/255.255.254.0 address. It can access anything on 172.29.[0-1].* no problem but the NTP and SIP servers no luck because they’re outside the 172.29.[0-1].* subnet. Basically looks like a bug to me. Contacted Cisco and long story short basically got a run around that lead no where.
I can work around the issue by setting up a UPD proxy on one of my servers. So instead of 126.96.36.199 for a DNS for example use 172.29.0.6… and for NTP use 172.29.0.20 (location of my UPD proxy). Thing is want to do it via the peplink router so I have less points of failure. (eg if the peplink is down so is the internet)
So what would be nice is something similar to your “Custom Service Forwarding Setup” just for UDP. Which makes things useful for other things… like NTP where I can point everything to the router and have it forward to and outside NTP server… (just for example)