From time to time, your administrator will need to upgrade the firmware on your handset. The handset downloads the new firmware file from the server.
After the download completes, the handset needs to install the file. You see a message on the screen to tell you to put your handset into the charging cradle. When you put the handset in the charging cradle, the LED flashes to alert you that the handset is loading the new firmware. Leave the handset in the charging cradle until the LED stops flashing.