Cisco 7800 Series Administration Manual page 69

Localize Your Cisco IP Phone
Procedure
Step 1
In the phone web user interface, navigate to Admin Login > advanced > Voice > Regional.
Step 2 Configure the values in the fields in the Time and Localization sections.
Step 3 Click Submit All Changes.
Time and Date Settings
The Cisco IP Phone obtains the time settings in one of three ways:
• 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 can contain a Date header
with the current time information. If the header is present, the phone uses it to set its clock.
• Manual Setup—You can use the phone web user interface to enter the time and date manually. However,
the NTP time or SIP Message Date overwrites this value when either is available to the phone. Manual
setup requires that you enter the time in 24-hour format only.
The time that the NTP Server and the SIP Date Header serve is expressed in GMT time. The local time is
obtained by offsetting the GMT according to the time zone of the region.
You can configure the Time Zone parameter with 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 automatic adjustment for daylight saving time.
Procedure
Step 1 In the phone web user interface, navigate to Admin Login > advanced > Voice > Regional.
Step 2
Set the Daylight Saving Time Enable drop-down list box to Yes.
Step 3 In the Daylight Saving Time Rule field, enter the DST rule. This value affects the time stamp on the CallerID.
Step 4 Click Submit All Changes.
Regional Parameters and Supplementary Services
Cisco IP Phone 7800 Series for Third-Party Call Control Administration Guide
55