I set up a new extension on a new Yealink T48S phone on the same subnet as the phone system. xxx.xxx.1.xxx. I unplugged the phone and it sat in a box for about a week until I was able to take it to it's new location in our other building with another subnet xxx.xxx.4.xxx. I went to plug it in this afternoon and it shows 'No Service', when I check the status on the phone it says 'Registration Failed'. The 2 buildings are connected via vpn and all other Yealink phones work fine. I have tried logging into the phone using the default admin usernames and passwords, but I keep getting the message that I am not authorized to access the phone. I've now been locked out of the phone for the next 24 minutes. If someone could provide assistance with this issue, I would appreciate it.