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Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones
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Parameters Permitted Values Default
0-Disabled
1-Enabled
2-Automatic
Web User Interface:
Settings->Time & Date->Daylight Saving Time
Phone User Interface:
Menu->Settings->Basic Settings->Time & Date->SNTP Setting->DST
local_time.dst_time_type 0 or 1 0
Description:
Configures the DST time type.
0-DST By Date
1-DST By Week
Note: It works only if the value of the parameter “local_time.summer_time” is set to 1
(Enabled).
Web User Interface:
Settings->Time & Date->Fixed Type
Phone User Interface:
None
local_time.start_time Time 1/1/0
Description:
Configures the start time of the DST.
Value formats are:

Month/Day/Hour (for DST By Date)

Month/Day of Week Last in Month/Day of Week/Hour of Day (for DST By Week)
If “local_time.dst_time_type” is set to 0 (DST By Date), use the mapping:
Month: 1=January, 2=February,…, 12=December
Day: 1=the first day in a month,…, 31= the last day in a month
Hour: 0=0am, 1=1am,…, 23=11pm
If “local_time.dst_time_type” is set to 1 (DST By Week), use the mapping:
Month: 1=January, 2=February,…, 12=December
Day of Week Last in Month: 1=the first week in a month,…, 5=the last week in a
month
Day of Week: 1=Monday, 2=Tuesday,…, 7=Sunday