If you purchased a used Polycom phone, you should reset the phone before using it. But sometimes, the default password does not work. Use this Polycom VVX 410 user guide in that case. You’ll need to use the phone’s MAC address to reset the phone: Note down the MAC address of the phone: Polycom VVX 410 and other Polycom 400 Series phones have the MAC address on a sticker label on the phone’s back. If you can’t read the sticker, navigate to Settings > Status > Platform > Phone to find your MAC address in the S/N field. Unplug your phone from the power source. Plug the phone back in Wait until you see Cancel and then press the Cancel button. Quickly press and hold down the 1, 3, and 5 keys. Keep the buttons pressed until you see a prompt asking you for the admin password. Enter the MAC address of the phone as the password. Confirm when asked for confirmation and proceed with the resetting process. Hopefully, this Polycom VVX 410 user guide has proven helpful.