In some cases, such as giving the phone to another user, you may need to conduct a Polycom SoundPoint IP 650 factory reset or perform some other phone configuration to make the VoIP phone work and resume voice communications. To do this, follow these steps: Record your phone’s serial number. You’ll find it on the back of the phone. Unplug the Polycom Soundpoint IP 650 power supply and the Power Over Ethernet cable, and then plug it back in. Wait for the screen to appear that says Loading Application in the user interface. Press the key under Cancel. When you see a countdown, press the 4, 6, 8, and * keys simultaneously on the dial pad. When you get prompted for the Polycom Soundpoint IP 650 default password, enter the phone’s serial number you wrote down in step one. If you need to switch between numbers and letters, press the second key on the left. Press OK. The phone will now begin the reboot process and may flash a few times before reconnecting to the IP network.