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Administrator's Manual 4. Configuring Networking
Version 3.4.3 51 400HD Series IP Phones
Parameter Description
system/ntp/sync_time/hours The number of hours.
The valid range is 0 to 24. The default is 12.
system/ntp/time_display_format The format of the time displayed on the phone screen.

24Hour (default)

12Hour
4.1.3 Configuring NTP Server via DHCP
If the phone is set to obtain GMT offsets and NTP servers via DHCP (default), it receives the
following fields in the DHCP options:

Primary Server and Secondary Server – (Option 4 or 42).
Note: If both options (4 and 42) are received, priority is given to Option 42.

Time Zone – (Option 2)
The phone sends an NTP request to the Primary NTP server. If there is no response, the
NTP request is sent to the Secondary NTP server.
After obtaining the time from the server, it adds the GMT offset in Option 2. This is the
updated system time.
Note:
These values will have no effect if TimeZone is set to be obtained from DHCP. If
Time Zone and NTP server are manually set, the phone acts as described above but the
values are obtained from the configuration file and not from DHCP.
Table 4-4: NTP Server and GMT Parameters
Parameter Description
system/ntp/gmt_offset Default: 00:00
Enables the NTP server from which the phone retrieves the date and
time.

0 Disable (default)

1 Enable – obtains the time information from a configured NTP server
4.2 Configuring IP Network Settings
The following section shows how to configure IP Network Settings including:

Static IP Address

Partial DHCP
4.2.1 Configuring Static IP Address
The static IP address can be configured using the following:

Phone screen

Configuration file