Linksys VOICE SYSTEM SPA 900 SERIES - Manual (Page 81)

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Linksys IP Phone Administrator Guide
Firmware Version 5.1
Chapter 3 Managing Linksys IP Phones
System Administration
Factory Reset
Factory reset resets all parameters to default value. The personal directory and call logs are also cleared.
You must confirm this option before continuing.
Password Protection
You can configure a password on the phone to protect against access to the certain options.
Managing the Time/Date
The Linksys IP phone obtains the current time information in one of the following 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 SPA may contain a Date header
with the current time information. If the header is present, the SPA uses it to update its current time.
• Manual Setup—The Linksys IP phone also lets you manually enter the current time and date from
the phone GUI or from the web page. However, this value is overridden by the NTP time or SIP
Message Date whenever they are presented 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 using the
<Time Offset (HH/mm)> parameter, which must be entered in 24-hour format. This parameter can also
be configured from the LCD display. The <Time Zone> and <Time Offset (HH/mm)> offset values are
not applied to the manual time/date setup.
Daylight Saving Time
The Linksys IP phone supports auto adjustment for daylight saving time. To enable this feature, the
administrator must configure the <Daylight Saving Time Rule> parameter on the Regional tab. This
parameter is a rule with three fields separated by semicolon (;) as shown below:
start=<start-time>;end=<end-time>;save=<save-time>
Where:
• <start-time> and <end-time> are of the form: <month>/<day>/<weekday>[/HH:[mm[:ss]]]
• <save-time> is of form: [/[+|-]HH:[mm[:ss]]] The <save-time> value can be preceded by a negative
(-) sign if subtraction is desired instead of addition.
• <month> = 1,2,12 (for Jan, Feb, Dec)
• <day> = [+|-]1,2,3,...,,31. If <day> is 1, it means the <weekday> on or before the end-of-the-month
(in other words the last occurrence of < weekday> in that month).