Our main receptionist phone is not receiving calls. When you call the number it goes straight to vm, like the phone isn't on the network. (Internal and External)Certain features on the phone itself aren't working, like "CFwdAll" you press this button and it immediately hangs up on the call/feature. I have switched the phone out completely and the issue follows the phone. I have deleted the phone including its ext recreated it and it still goes to VM and certain features don't work. Any ideas or thoughts on what might be causing this issue?