Linksys SPA922 Cisco Small Business Pro SPA and Wireless IP Phone Administrati - Page 169

Managing the Time and Date, Configuring Daylight Savings Time, Time Zone, Time Offset HH/mm - configuration manual

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Configuring Regional Parameters and Supplementary Services Localizing Your IP Phone 8 Managing the Time and Date Cisco IP phones obtain the current time information in one of three ways: • NTP Server-You can configure one or two NTP servers on the phone. When the phone first boots up, it tries to contact the first NTP server to get the current time. The phone periodically synchronizes its time with the NTP server. The synchronization period is fixed at 1 hour. In between updates, the phone tracks time with its own internal clock. • SIP Messages-Each SIP message (request or response) sent to the phone may contain a Date header with the current time information. If the header is present, the phone uses it to update its current time. • Manual Setup-The phone also lets you manually enter the current time and date from the phone GUI or the web UI. However, this value is overridden by the NTP time or SIP Message Date whenever they are available to the phone. Manual setup requires you to enter the time in 24-hour format only. 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 from the web page or through provisioning. This time can be further offset by the Time Offset (HH/mm) parameter, which must be entered in 24-hour format. This parameter can also be configured from the phone's LCD display. NOTE: The Time Zone and Time Offset (HH/ mm) offset values are not applied to manual time and date setup. Configuring Daylight Savings Time The phone supports auto adjustment for daylight saving time. You must set Daylight Savings Time Enable to yes and enter the DST rule. This option affects the time stamp on CallerID. To enter the rule for calculating DST, include the start, end, and save values separated by semi-colons (;) as follows: Start = start-time; end=end-time; save = save-time Cisco SPA and Wireless IP Administration Phone Guide 167

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Configuring Regional Parameters and Supplementary Services
Localizing Your IP Phone
Cisco SPA and Wireless IP Administration Phone Guide
167
8
Managing the Time and Date
Cisco IP phones obtain the current time information in one of three ways:
•
NTP Server—You can configure one or two NTP servers on the phone.
When the phone first boots up, it tries to contact the first NTP server to get
the current time. The phone periodically synchronizes its time with the NTP
server. The synchronization period is fixed at 1 hour. In between updates,
the phone tracks time with its own internal clock.
•
SIP Messages—Each SIP message (request or response) sent to the phone
may contain a Date header with the current time information. If the header is
present, the phone uses it to update its current time.
•
Manual Setup—The phone also lets you manually enter the current time and
date from the phone GUI or the web UI. However, this value is overridden by
the NTP time or SIP Message Date whenever they are available to the
phone. Manual setup requires you to enter the time in 24-hour format only.
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 from the web page or through
provisioning. This time can be further offset by the
Time Offset (HH/mm
)
parameter, which must be entered in 24-hour format. This parameter can also be
configured from the phone’s LCD display.
Configuring Daylight Savings Time
The phone supports auto adjustment for daylight saving time. You must set
Daylight Savings Time Enable
to
yes
and enter the DST rule. This option affects the
time stamp on
CallerID
.
To enter the rule for calculating DST, include the start, end, and save values
separated by semi-colons (;) as follows:
Start =
start-time
; end=
end-time
; save =
save-time
NOTE:
The
Time Zone
and
Time Offset (HH/
mm)
offset values are
not
applied to manual
time and date setup.