How to Reset Cisco 7821 TP Phone to the Factory Default


Perform 7821 IP Phone Factory Reset Through Phone Keypad

Use these steps to reset the phone to factory default settings using the phone keypad –


Step by step procedure –

Step 1  – Unplug the phone:

If using PoE, unplug the LAN cable. If using the power cube, unplug the power cube.

Step 2 –  Wait 5 seconds.

Step 3 –  Press and hold # and plug the phone back in.

Step 4 –  When the light on the Mue button and handset light strip turns off and all other lights (Line button, Headset button, Speakerphone button, and Select button) stay green, press 123456789*0# in sequence.

When you press 1, the lights on the line buttons turn red. The light on the Select button flashes when a button is pressed.

After you press these buttons, the phone goes through the factory reset process.

If you press the buttons out of sequence, the phone powers on normally.

Warning –

Do not power down the phone until it completes the factory reset process, and the main screen appears.


Perform 7821 IP Phone Factory Reset from Phone Menu –

To perform a factory reset of a phone,

Step by step procedure –

Step 1   Press Applications.

Step 2   Choose Admin Settings > Reset Settings > All.

If required, unlock the phone options.

Watch this video for more information on cisco 7821 factory reset –


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