Yealink SIP-T48G Administrator's Manual page 100

Microsoft Lync Edition Administrator's Guide for SIP-T2_Series and T4_Series IP Phones
Parameters
Phone User Interface:
None
local_time.offset_time
Description:
Configures the offset time (in minutes) of DST.
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->Offset(minutes)
Phone User Interface:
None
To configure the DST via web user interface:
1. Click on Settings->Time & Date.
2. Select Disabled from the pull-down list of Manual Time.
3. Select the desired time zone from the pull-down list of Time Zone.
4. Enter the domain names or IP addresses in the Primary Server and Secondary
Server fields respectively.
5. Enter the desired time interval in the Synchronism (15~86400s) field.
6. Mark the Enabled radio box in the Daylight Saving Time field.
- Mark the DST By Date radio box in the Fixed Type field.
Enter the start time in the Start Date field.
88
Permitted Values
Integer from -300 to 300
Default
Blank