How to Reset Cisco 7821 IP Phone to the Factory Default

To reset Cisco 7821 IP Phone (TelePresence or standard) to factory default configuration, follow these steps carefully. Factory reset will erase all settings, including network and configuration info. We will discuss 2 methods to reset Cisco 7821 IP – One, using the phone keypad and second using the phone menu.

Perform Cisco 7821 IP Phone Factory Reset

Method 1: Through Phone Keypad

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

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 Mute 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.

Method 1: Through Phone Menu

To perform a factory reset of a phone –

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 –

ABOUT THE AUTHOR

Rashmi Bhardwaj

Founder of AAR TECHNOSOLUTIONS, Rashmi is an evangelist for IT and technology. With more than 12 years in the IT ecosystem, she has been supporting multi domain functions across IT & consultancy services, in addition to Technical content making.

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