Yealink SIP-T4X Administration Manual page 285

Administrator's Guide for SIP-T4X IP Phones
Format
Default Value
Range
Example
Parameter-
local_time.dhcp_time
Description
Format
Default Value
Range
Example
Parameter-
local_time.offset_time
Description
270
If "local_time.dst_time_type" is set to 1 (By
Week), use the mapping:
Month: 1=Jan, 2=Feb,..., 12=Dec
Week of Month: 1=the first week in a month,...,
5=the last week in a month
Day of Week: 1=Mon, 2=Tues,..., 7=Sun
Hour of Day: 0=1am, 1=2am,..., 23=12pm
Note: It works only if the parameter
"local_time.summer_time" is set to 1
(Enabled).
The value formats are:
MM/DD/HH (For By Date)

Month/Week of Month/Day of Week/Hour

of Day (For By Week)
12/31/23
1to 12/1 to 31/0 to 23 (for By Date)
1 to 12/1 to 5/1 to 7/0 to 23 (for By Week)
local_time.end_time = 12/31/23
Configuration File
<MAC>.cfg
It enables or disables the phone to update
time with the offset time obtained from the
DHCP server.
Note: It is only available to offset from GMT 0.
Boolean
0
Valid values are:
0-Disabled
1-Enabled
local_time.dhcp_time = 1
Configuration File
<MAC>.cfg
Configures the offset time (in minutes) of DST.
Note: It works only if the parameter
"local_time.summer_time" is set to 1