We have well over 200 VVX 500 phones in deployment. We had one that begun a boot loop out of the blue. That phone's since been replaced but I have the faulty one on my desk. I was poking around and I can hit cancel on the starting application screen and factory reset it. But even factory reset after starting application, the screen goes black and then all the lights come on and it starts the boot process over. This was originally plugged into a Cisco 3750 switch stack in another building, but the same behavior happens plugged into a Cisco 3750 switch stack here in my building.
Just for the heck of it I plugged it into an Extreme Networks 450G2 series poe switch and the phone boots up normally. I verified that it obtained the proper voice IP address and the phone works. Why would this single phone only work in an Extreme Networks switch? We have at least 199 other phones that work fine in either.
When it boots up on the Extreme switch though it does show a warning - Rear USB port is disabled temporarily. Detach the USB device and reboot the phone. I can tap on OK to make this go away. However there is NOTHING plugged into the rear USB ports. Why would it say that?