From a 7310, 7324, or 7316 phone:
Dial Feature 985
Tap the “9” key on the phone to display “PSWD.” Enter the code “73738767793.”
Push the “YES” button on the unit when the “RESET PSWD?” message appears on the display screen. The message “Password Reset” will appear in the phone display and the password will be returned to its default setting, based upon your model of phone.
4
Press the “Feature” button again and enter “983” into the phone system. “LOG” appears on the screen. Enter the default password for the phone system. The default password on a system that used two-digit extensions is “120000,” the password on a three-digit phone system is “1020000,” and the password on a four-digit phone system is “10020000.”