To factory reset an Avaya 1608 Handset you will need to do the following:
- Reboot the phone
- When the display shows “Press * to Program”, press *
- Repeatedly press # until the message “Enter Command” appear.
- Press the Mute key followed by 25327#.
- The display will show “Clear all values” *=no #=yes
- Press #
- The display will show “Are you sure?” *=no #=yes
- Press # and the phone will reboot back up in factory default.