Time Zone; Daylight Saving Time - Yealink SIP-T4X Administration Manual

2. Press or , or the Switch soft key to select the desired value from the
Keypad Lock Enable field.
3. Press or , or the Switch soft key to select the desired type from the Keypad
Lock Type field.
4. Press the Save soft key to accept the change.
To configure a keypad lock key via phone user interface:
1. Press Menu->Call Features->DSS Keys.
2. Select the desired DSS key.
3. Press or
4. Press or
field.
5. (Optional.) Enter the string that will appear on the LCD screen in the Label field.
6. Press the Save soft key to accept the change.
IP phones maintain a local clock and calendar. Time and date are displayed on the idle
screen of the IP phone. Time and date are synced automatically from the NTP server by
default. The NTP server can be obtained by DHCP or configured manually.If IP phones
cannot obtain the time and date from the NTP server, you need to manually configure
them. The time and date display can use one of several different formats.

Time Zone

A time zone is a region on Earth that has a uniform standard time. It is convenient for
areas in close commercial or other communication to keep the same time. When
configuring IP phones to obtain the time and date from the NTP server, you must set the
time zone.

Daylight Saving Time

Daylight Saving Time (DST) is the practice of temporary advancing clocks during the
summertime so that evenings have more daylight and mornings have less. Typically,
clocks are adjusted forward one hour at the start of spring and backward in autumn.
Many countries have used the DST at various times, details vary by location. The DST
can be adjusted automatically from the time zone configuration. Typically, there is no
need to change this setting.
, or the Switch soft key to select Key Event from the Type field.
, or the Switch soft key to select Keypad Lock from the Key Event
Configuring Basic Features
47