Same problem, with 1022 IP Phone, started around 2pm CST for me, and outbound and inbound isn't working. Inbound rings, but when I answer it is a dead line. Outbound, I get the 403 error message. Green on Obi Dashboard.
FWIW this happened a few weeks ago when we were all experiencing the other glitchy static stuff, but it only lasted a few minutes. The past week or so things have been fine until today.
Very frustrating, trying to run a business here! Fortunately, I have my back-up USB headset I can plug into my PC and Google Voice is still working.
One additional note, I was watching some YouTube before this happened and YouTube was very glitchy. My internet speed is super duper fast, so that wasn't the issue. Then, the Obi 1022 stopped working. I must add, even though I have my backup USB headset for my PC for making and receiving calls, and it works, but it isn't really working that well; I have a lot of broken sound and distortion on some voices when calling.
This might be an internet issue...