Cisco IP Phone CP-8845 8800/8900 Series How To Reset To Factory Settings Instructions

This would be crucial especially if the phone is hardened, not being able to reset or change settings could prevent a phone registering in a new environment or even when migrating from office to office.

Here is Cisco's guide (timing is everything and it is more tricky than trying to jail break your iPhone):


Step 1 -- While powering up the phone, press and hold #.

Step 2 -- 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 flash when a button is pressed.

If you press the buttons out of sequence, the lights on the line button, headset button, speakerphone button, and select button turn green. You will need to start over and press 123456789*0# in sequence again.

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

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

Here is an alternative description some have had better luck with:

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.

If you press the buttons out of sequence, the lights on the line button, headset button, speakerphone button, and Select button turn green. You need to start over and press 123456789*0# in sequence again.

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

 

*Just be forewarned again that it may take a few tries but it does work.

Sources: https://community.cisco.com/t5/ip-telephony-and-phones/cp-8945-factory-reset-not-working/td-p/2502278


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