If the IP phone is not successfully registered and configured, perform the following steps. Ensure phone is receiving PPOE power from Switch in Server closet. Then, on the phone: 

1. button (TS-350i) / button (TS-550i).
   
2. Press 6 to enter the default all settings menu.
   
3. Press the Yes softkey to default the settings.
   
4. Press the button (TS-350i) / button (TS-550i) to exit the menu.
   
5. The phone will request you reboot the phone. Press the Yes softkey to initiate the reboot. It should take no more than 1 minute for boot process to finish.