Obi202 only rings shortly after reboot

[RomanObi202]

I apologize if there is already a post about this but I couldn't find anything similar. My obi doesn't not ring the phone for some reason. It only rings after I unplug it and plug it back in and after twenty minutes or so I call it and it doesn't ring anymore.

What I have tried already
*Reset and revert settings in obi expert configuration
*Delete and reconfigure service provider (ring.to)

Any troubleshooting steps are greatly appreciated.

[drgeoff]

Can you still make outgoing calls after that 20 minutes?

Does ring.to still show as registered after that 20 minutes?

If you put the OBi in your router's DMZ does the problem go away. If yes, I'm not (yet) recommending that as a permanent fix.