How to Factory Reset a Cisco Desk Phone

Summary

Sometimes it is necessary to do a factory reset on your ip phone. This can clear up issues such as phone call history not being listed anymore.

Body

Desk Phone issues can often be resolved by unplugging the LAN cable and allowing it to reboot. If that does not work, a factory reset may be needed.

An ethernet cable

Follow these instructions to reset the phone according to your model below:

Click the "Show" checkbox to expand or hide the section.

Factory reset of the Cisco 79XX series phonesShow

Step 1

Unplug the power cable from the phone and then plug it back in.

The phone begins the power-up cycle.

Step 2

While the phone is powering up, and before the Speaker button flashes on and off, press and hold #.

Continue to hold # until each line button flashes on and off in sequence in orange (for the Cisco Unified IP Phone 7975G, 7971G-GE and 7970G) or amber (for the Cisco Unified IP Phone 7965G and 7945G).

Step 3

Release # and press 123456789*0#.

You can press a key twice in a row, but if you press the keys out of sequence, the factory reset does not take place.

After you press these keys, the line buttons on the phone flash orange and then green (for the Cisco Unified IP Phone 7975G, 7971G-GE and 7970G) or red (for the Cisco Unified IP Phone 7965G and 7945G), and the phone goes through the factory reset process. This process can take several minutes.

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

Factory reset the 88XX series phonesShow

Factory Reset the Phone with the Keypad

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

You have two methods to perform the factory reset by using the keypad:

Method 1 (recommended): Press # > 123456789*0#
Method 2: Press 0 > 369#

Note

It helps to know if your phone is an original hardware release, or if the hardware has been updated and re-released.

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:

Do one of the following actions:
- Method 1: Press and hold # and plug the phone back in.
- Method 2: Press and hold 0 and plug the phone back in.

Only the Cisco IP Phone 8845, 8865, 8841, 8851 and 8861 support this method. And the hardware version of Cisco IP Phone 8841, 8851, and 8861 must be 15 or later.

The phone begins the reboot process. The headset button and the speaker button light up.

On earlier hardware versions, the Mute button lights up. Wait for the Mute button to turn off.

Step 4:

Do one of the following actions:
- Method 1: Press 123456789*0# in sequence.
  - When you press 1, the lights on the headset button turns off. 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.

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

Method 2: Press 369# in sequence.
- For the Cisco IP Phone 8845, 8865, 8841, 8851 and 8861, the phone screen disappears. At the same time, the lights on the Headset, Speaker, and Mute are flashing.

Step 6:

If you use the Method 2, unplug and plug in the phone again to reboot it.
After the phone reboots, the main screen appears.

Details

Article ID: 135698

Created

Wed 9/15/21 10:54 AM

Modified

Wed 6/19/24 3:45 PM

Internal or External

External

Related Services / Offerings

Related Services / Offerings (1)

Desk Phone: Report an Issue

Report an issue with a desk phone.