Unplug your phone from the Obi and check the Phone Port status again with nothing plugged into the phone ports.
If you've got still got nothing, even after a power cycle, it's probably fried. You'll need a replacement.
If you've got something, the phone is probably fried or its wire is dead-shorted. Try another phone.
It is interesting that the core function of the device is still there. The CPU is up, ethernet is working, and it's managing to register itself. So, a power surge through the supply never happened or the whole thing would be dead. DrGeoff is probably on the money with a suggestion that your house wiring might have picked up a giant static blast from a nearby storm and fried the phone port. I'm wondering why both phone ports would be fried if only one was connected, unless the port interfaces are sharing a common chip. Regardless, a repair is probably beyond the average hobbyist/mortal.
One last thing: verify that you have no dial tone on either phone port.
Disclaimer: I'm not a big time Obihai expert or hardware wiz, just another random (but long-time) user taking my best guess.