Perform 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:
CTL file: Erased
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. The phone recovers by loading the appropriate default load file (term62.default.loads, term61.default.loads, term42.default.loads, or term41.defaults.loads) depending on the phone model.
Before you perform a factory reset, ensure that the following conditions are met:
The phone must be on a DHCP-enabled network.
A valid TFTP server must be set in DHCP option 150 or option 66 on the DHCP server.
The default load file for your phone model and the files specified in that file should be available on the TFTP server that is specified by the DHCP packet.
To perform a factory reset of a phone, perform the following steps:
Unplug the power cable from the phone and then plug the cable back in.
The phone begins its power-up cycle.
While the phone is powering up, and before the Speaker button flashes on and off, press and hold #. Continue to hold # until each line button flashes on and off in sequence in amber.
Release # and press 123456789*0#. You can press a key twice in a row, but if you press the keys out of sequence, the factory reset will not take place.
After you press these keys, the line buttons on the phone flash red, and the phone goes through the factory reset process.
Do not power down the phone until it completes the factory reset process, and the main screen appears