Cisco 9900 Series IP Phones Factory Reset Method

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  1. Unplug any PoE Ethernet cable or power supply
  2. With the phone completely powered off, press and hold the # button
  3. While still depressing the # button, connect power brick or PoE Ethernet
    1. The two top LEDs will be amber
    2. The mute light will stay red
  4. Immediately let go of the # button (lights will not change or you have failed)
  5. Immediately type the sequence 123 456 789 *0# without mistyping
  6. Only now will the red mute light go out
  7. The phone will boot up in FACTORY RESET state (top amber lights turn green, CISCO white screen appears)
    1. if it doesn’t, there’s something wrong with your phone