Configuring Regional Parameters and Supplementary Services
Localizing Your IP Phone
Cisco SPA500 Series and WIP310 IP Phone Administration Guide
145
7
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.
Language
Selection
Specifies the default language. The value must match one of the
languages supported by the dictionary server. The script (dx
value) is as follows:
<Language_Selection ua="na">
</Language_Selection>
Defaults to blank; the maximum number of characters is 512. For
example:
<Language_Selection ua="na"> Spanish
</Language_Selection>
Field
Description
