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A or SRV records. This feature is particularly useful when you want to enable proxy redundancy without using any DNS
servers. Note that the only way to provide a list of redundant servers to the phone is through the use DNS A or DNS SRV
records.
NTP Servers and Local Time
The phone keeps track of current time by querying NTP servers (using SNTP). Up to 2 NTP servers may be configured
using the
NTPServer1
and
NTPServer2
parameters. The local time is determined for the local time zone that is set
in the
LocalTimeZone
parameter. The phone queries the NTP servers once per hour to update the current time,
which is interpolated by the phone using its own local clock in-between NTP refreshes.
Daylight saving time can be enabled by enabling the option
DaylightSavingTimeEnable
. Daylight saving time is
automatically adjusted based on the start and end rules specified in
DaylightSavingTimeStart
and
DaylightSavingTimeEnd
parameters. The amount of time to adjust when daylight saving time is in effect can be
configured in the
DaylightSavingTimeDiff
parameter.
There is another mechanism that can be used by the phone to tell time and it is based on SIP signaling. When the
phone renews registration with a SIP proxy server, the server may include a Date header in the response to the phone
that indicates the current GMT time. The phone will process this time value the way it does with the result from the
NTP servers, if
ITSP Profile X – SIP
::
X_ProcessDateHeader
is enabled.
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