How to Reset Cisco 7821 TP Phone to the Factory Default

Rashmi Bhardwaj | Blog,Config & Troubleshoot

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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