DHCP server: To dynamically assign IP addresses to the devices and optionally provide the other configuration parameters to the device. The DHCP server also provides the device with the addresses of the SIP controller and the provisioning server.

HTTP or HTTPS provisioning server: To download and save the software distribution package and the settings file. To provide software distribution package (J100Supgrade.txt), configuration files (46xxsettings.txt) and resource files such as custom ringtones, backgrounds, screensavers, and certificates.

SNTP server: To provide the device with accurate date and time.