Follow below simple steps to perform factory reset your Cisco 7942 IP Phone
- Unplug network cable from the back of phone and then plug network cable back in. The phone will begin its power up process.
- Press and Hold # Key from one finger when you are plugging network cable back in and before Speaker Button flash on and off keep holding # Key
- Release # Key and press 123456789*0#
If you press keys unsequencely or make delay to release or hold # Key phone will boot normally hence make sure to press these steps carefully and if phone boot normally you have to perform above steps again. Below is Video guide to help you to perform factory reset on cisco phone.