Localizing Your IP Phone
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 197
7
• 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 configuration utility. 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 Saving 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
For example, the default DST rule is
start=4/1/7;end=10/-1/7;save=1.
The
start-time
and
end-time
values specify the start and end dates and times of
daylight saving time. Each value is in this format:
month/day/ weekday[/HH:mm:ss]
The
month
value equals any value in the range 1-12 (January-December).
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