AudioCodes 400HD Series - Configuring NTP Server Via DHCP

400HD IP Phones Series - Teams Compatible
Administrator's Manual 116 Document #: LTRT-09960
3.6.4.2 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, the higher priority is given to Option 42.
 Time Zone – (Option 2) (see the table below for more information)
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.
 To manually configure NTP / GMT offset:
 Configure the NTP and Time Settings using the table below as reference.
Note: If the 'Obtain Time Zone from DHCP' parameter is set to Disabled, only the
Primary Server NTP server parameter will be modifiable.
Table 3-54: NTP Server and GMT Parameters
Parameter Description
system/ntp/gmt_offset
Default is 00:00
Enables the NTP server from which the phone
retrieves the date and time.
 [0] Disable
 [1] Enable – obtains the time information
from a configured NTP server
network/lan/dhcp/ntp/server_list/enabled
Enables prioritization of the NTP server’s
information received from the DHCP server
(Option fields 42 or 4), over the static
configuration
(system/ntp/primary_server_address and
system/ntp/secondary_server_address).
 [0] Disable

[1]
Enable (default)
network/lan/dhcp/ntp/gmt_offset/enabled
Enables prioritization of the NTP GMT offset
information received from the DHCP server
(Option field 2), over the static configuration
(system/ntp/gmt_offset).
 [0] Disable
 [1] Enable (default)