You can reset the phone to factory default settings by using buttons directly on the phone, or by accessing the phone's admin GUI via a local web browser.

Directly From the Phone

1. Press the Menu button.
   
   

   Open

   

2. Highlight the option Setting and press the Enter button. 
   
   

   Open

   

3. Highlight the option Advanced Setting and press the Enter button.
   
   

4. You will then be prompted to enter the password for this device. By default, the password is admin. Enter the password using the phone keypad, and press the Enter button.
   
   

5. Highlight the option Phone Setting and press the Enter button.
   
   

6. Then select the option Factory Reset and press the Enter button.
   
   

7. A warning message will then appear asking you if you're sure you want to reset to factory default settings. Press OK to proceed or Cancel to abort. 
   
   

From the Phone GUI

1. Enter the IP Address of the device into a local web browser.

2. When prompted, enter admin as the user name. The password, by default, is also admin. Click OK after you have entered the user name and password.
   
   

    

3. From the homepage of the GUI, click on Management from the options at the top. Then click on Upgrade from the dropdown menu.
   
   

4.  From here, simply press the Reset to Factory button.  
   
   

5. A warning message will then appear asking you if you're sure you want to reset to factory default settings. Press OK to proceed or Cancel to abort.  
   
   

Factory Reset without Password

Option #1

1. Press the Menu button. 
   
   

    

2. Press the "*" key 3 times and then press and hold the "X" key for 10 seconds.
   
   

3. Phone will now preform a factory reset.
   
   

Option #2

1. When the phone is powering on, during the Initializing step, press the "#" key 3 times and then press and hold the "*" key for 10 seconds.
   
   

    

2. Phone will now perform a factory reset.