Reset to default values

1. menu...
2. **2 => yes

Reboot phone

1. **#**

or

http://phone.ip.address/reset

1. Press the Menu button.
2. Choose Settings → Network Configuration.
3. From the Network Configuration menu, press <fc #ff0000>**#</fc>.
4. If the phone displays “Enter Admin Password”, enter your password and then press the Accept softkey.
5. Look at the icon in the upper-right portion of the LCD.

When options are locked, the icon appears as a locked padlock. When options are unlocked, the icon appears as an unlocked padlock.

Perform the following steps to restore factory default settings. This is particularly useful when you forget the password.

1. Press <fc #ff0000>*</fc>, <fc #ff0000>0</fc>, and the <fc #ff0000>4 softkey</fc> simultaneously. The manufacturing test-option screen appears.
2. Type <fc #ff0000>322873738#</fc> and press <fc #ff0000>*</fc>. (322873738 - spells “<fc #ff0000>factreset</fc>”)
3. Press <fc #ff0000>*</fc>, <fc #ff0000>0</fc>, and the<fc #ff0000>4 softkey</fc> again, or power-cycle the phone. You return to normal operation.

The following sections include instructions for setting configuration options using a phone's web page. To set configuration options in this way, you must first use the UIPassword parameter in the phone's profile file to set up a password. If you do not set up a password, you will not be able to change network settings, and Apply will not be available.

https://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7905g_7912g/3_3/english/administration/guide/7900set7.html