Unregistered Phone DIY Troubleshooting

Here are three troubleshooting steps that you can try to get the Cisco IP phone to register:

Option 1

• Power cycle the device by unplugging the physical ethernet cable, and power adapter if applicable, and plugging it back in.

Option 2

• Perform a soft reset using the Cisco IP phone on screen display:
  1. Press the Applications button
  2. Select Administrator Settings
  3. Enter password (xxxx) using T-9 dialing
  4. Then select Reset Settings
  5. Then select All Settings
  6. It will then prompt you to Reset Device Select Reset
                   NOTE: All settings Resets user and network configuration settings to their factory-default values, and restarts the phone
  
  

Option 3

Perform a full factory reset using the Cisco IP phone buttons:

1. Remove power from the phone in one of these ways: Unplug the power adapter. Unplug the LAN cable
2. Press and hold the pound (#) key and plug the phone in
3. When the mute button is red and the top left and right line buttons are amber, enter the following key sequence: 123456789*0# The phone resets.

Keys to clarity:

Performing a Factory Reset

When you perform a factory reset of the Cisco Unified IP Phone, the following information is erased or reset to its default value:

•User configuration settings—Reset to default values

•Network configuration settings—Reset to default values

•Call histories—Erased

•Locale information—Reset to default values

•Phone application—Erased (phone recovers by using the image in the inactive partition of flash to boot up).