I was given a couple of, what I believe to be, refurb D230s, and have tried factory resetting them, but they seem to maintain the provisioning values from a previous provider. I have tried to manually clear these values but they will always return, even after factory defaulting the base stations and hand sets.
The issue that I'm having is that the phones, once configured for our PBX will not receive inbound calls, but will display the correct information when dialing out. The phones register in our PBX, so I'm pretty sure that's not the issue. But I would like to make sure that all settings are factory defaulted so that I can rule out the phone config.