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NTP managed service means that you can configure NTP settings from sipXconfig UI and relay on sipXecs for starting / stopping NTP when needed (e.g. when configuration changed and needs to be applied). NOTE: not all possible NTP settings are exposed in sipXconfig UI
Unmanaged service
When NTP is marked as unmanaged service then sipXecs won't generate any configuration (/etc/ntp.conf) or issue any service start / stop commands. This is up to the admin, however some other system components (like phones) still need info about NTP configuration. That's why in addition to turning service in an unmanaged service, admin can also specify additional NTP servers phones or other components should default to.
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The gateway configuration will be automatically filled in with specified servers
DHCP
Managed service
Same as for NTP and DNS, managed DHCP means that you want to run dhcpd on sipXecs and have all configuration / management performed by sipXecs. There are settings you could configure but certain are not possible (like multiple subnet configuration). We're looking for user feedback in order to expose settings that are mostly used.
Unmanaged service
When DHCP is marked as unmanaged service creating configuration files (dhcpd.conf) and stopping / starting DHCP service it's up to admin.
IPTables
TBD
Phonelogd
TBD