ATCOM 5520 User Manual page 56

As...." then you will save the config file in .txt format .
Clear Config: user can restore factory default configuration and reboot the
phone. If you login as Admin, the phone will reset all configurations and
restore factory default; if you login as Guest, the phone will reset all
configurations except for VoIP accounts (SIP1、SIP2 and IAX2) and version
number.
、
Click the browse button, find out the config file saved before or provided by
manufacturer, download it to the phone directly, press "Update" to save. You can
also update downloaded update file, logo picture, ring, mmiset file by web.
Server: FTP/TFTP server address. It can be the format of IP address such as
56