Manage The Time And Date; Configure Daylight Saving Time - Cisco 8831 Administration Manual

Chapter 7 Configure Regional Parameters and Supplementary Services

Manage the Time and Date

The Cisco conference phone obtains the time settings in one of three ways:
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The time served by the NTP Server and the SIP Date Header are expressed in GMT time. The local time
is obtained by offsetting the GMT according to the time zone of the region.
The Time Zone parameter can be configured by using the phone web user interface or through
provisioning. This time can be further offset by the Time Offset (HH/mm) parameter. This parameter
must be entered in 24-hour format and can also be configured from the IP phone screen.
The Time Zone and Time Offset (HH/mm) offset values are not applied to manual time and date setup.

Configure Daylight Saving Time

The phone supports auto adjustment for daylight saving time. You must set Daylight Saving Time Enable
to Yes and enter the DST rule. This option affects the time stamp on the CallerID.
To enter the rule for calculating DST, include the start, end, and save values separated by semi-colons
(;) as follows:
For example, the default DST rule is:
The start-time and end-time values specify the start and end dates and times of daylight saving time. The
format is:
The month value equals any value in the range 1-12 (January-December).
The day value equals any + or - value in the range 1-31. If the day value is -1, the time changes on the
last occurrence of a weekday in that month. If the day value is -2 to -31 (max day value for that month)
then the time changes on the weekday in that month (or previous month) on or before that day of the
month.
The weekday value equals any value in the range 1-7 (Monday-Sunday). It can also be 0. If the weekday
value is 0, it means that the date to start or end daylight saving is the given date. In that case, the day
value must not be negative. If the weekday value is positive (but not 0) then the daylight saving starts or
ends on the weekday value on or after the given date. If the weekday value is negative (not -1), then the
daylight saving starts or ends on the weekday value on or before the given date.
Optional time values: HH represents hours (0-23), mm represents minutes (0-59). and ss represents
seconds (0-59). Optional values inside brackets [ ] are assumed to be 0 if not specified. Midnight is
represented by 0:0:0.
NTP Server—When the phone boots up, it tries to contact the first Network Time Protocol (NTP)
server to get the time. The phone periodically synchronizes its time with the NTP server. The
synchronization period is fixed at 1 hour. Between updates the phone tracks time with its internal
clock.
SIP Messages—Each SIP message (request or response) sent to the phone could contain a Date
header with the current time information. If the header is present, the phone uses it to set its clock.
Manual Setup—The time and date can be entered manually by using the phone web user interface.
However, this value is overwritten by the NTP time or SIP Message Date whenever they are available
to the phone. Manual setup requires that you enter the time in 24-hour format only.
Start = start-time; end=end-time; save = save-time
start=3/-1/7/2;end=10/-1/7;save=1.
month/day/weekday[/HH:mm:ss]
Cisco Unified IP Conference Phone 8831 for Third-Party Call Control Administration Guide
Localize Your Conference Phone
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