Well it appears that I found a solution to the numerous UDP connections.
Using the device config, I had to
ENABLE OBiTALK Service, Reboot to ensure it stuck, then
DISABLE OBiTALK Service and finally Reboot.
Now I only show 1 occasional UDP connection to DNS, and 2 TCP connections - to Google Voice I presume, since I have SP1 and SP2 setup that way.
Only an educated guess, but it looks like we need a better way to force a reload of the config settings after a firmware upgrade.