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SIP Message Date whenever they are presented to the phone. Manual setup requires the user to
enter the time in 24 hour format only.
Note that the time served by the NTP Server and the SIP Date Header are GMT time. The local time is
obtained by offsetting the GMT according to the time zone of the region. <Time Zone> can be configured
from the web page or provisioning. This time can be further offset by <Time Offset (HH/mm)> parameter,
which must be entered in 24 hour format only. This parameter can be configured from the Phone GUI
also.
The <Time Zone> and <Time Offset (HH/mm)> offset values are not applied to the manual time/date
setup.
Daylight Saving Time
The SPA941 supports auto adjustment for daylight saving time. To enable this feature, the administrator
must configure the <Daylight Saving Time Rule> (regional) parameter. This parameter is a rule with three
(3) fields. Each field is separated by semicolon (;) as shown below:
start=<start-time>;end=<end-time>;save=<save-time>
where
<start-time> and <end-time> are of the form: <month>/<day>/<weekday>[/HH:[mm[:ss]]]
<save-time> is of form: [/[+|-]HH:[mm[:ss]]]
<month> = 1,2,3,…,12 (for Jan, Feb, …, Dec)
<day> = [+|-]1,2,3,…,31
<weedday> = 1, 2, 3, …, 7 (for Mon, Tue, …, Sun), or 0 which has special meaning
HH = hour (0-23)
mm = minute (0-59)
ss = second (0-59)
<start-time> and <end-time> specify the start and end time-date of daylight saving time and <save-time>
is the amount of hour/min/sec to add to the current time during daylight saving period. The <save-time>
value can be preceded by a negative (-) sign if subtraction is desired instead of addition.
If <weekday> is 0, it means the date to start or end daylight saving is at exactly the given date. In that
case, the <day> value must not be negative. If <weekday> is not zero, then the daylight saving starts or
ends on the <weekday> on or after the given date if <day> is positive, or on or before the given date if
<day> is negative. If <day> is –1, it means the <weekday> on or before the end-of-the-month (in other
words the last occurrence of < weekday> in that month).
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