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Administrator’s Guide for SIP-T4X IP Phones
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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).
Format
The value formats are:

MM/DD/HH (For By Date)

Month/Week of Month/Day of Week/Hour
of Day (For By Week)
Default Value 12/31/23
Range
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)
Example local_time.end_time = 12/31/23
Parameter-
local_time.dhcp_time
Configuration File
<MAC>.cfg
Description
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.
Format Boolean
Default Value 0
Range
Valid values are:
0-Disabled
1-Enabled
Example local_time.dhcp_time = 1
Parameter-
local_time.offset_time
Configuration File
<MAC>.cfg
Description
Configures the offset time (in minutes) of DST.
Note: It works only if the parameter
―local_time.summer_time‖ is set to 1