This will describe how to Reset the Cisco CP-7940 and CP-7960 IP Phones to the Factory Default. This procedure assumes that you do not know the unlock password as there is another procedure for resetting a phone if you do know the unlock password.
* How do I unlock a Cisco CP-7960 running SIP software?Product: Cisco CP-7960 and CP-7960G
In SIP releases 4.2 and later, an Unlock Config item displays in the phone settings menu. When you select Unlock Config, you are prompted to enter a phone password. When the correct password is entered, the configuration is unlocked and the settings can be changed. When the Network Configuration or SIP Configuration menus display, the lock icon in the upper-right corner of the LCD indicates an unlocked state. The unlocked symbol indicates that you can modify the network and SIP configuration settings.The phone automatically relocks the configuration.