Yealink SIP-T48G Administrator's Manual page 101

Enter the end time in the End Date field.
Mark the DST By Week radio box in the Fixed Type field.
-
Select the desired values of DST Start Month, DST Start Day of Week,
DST Start Day of Week Last in Month, Start Hour of Day; DST Stop Month, DST
Stop Day of Week, DST Stop Day of Week Last in Month and End Hour of Day
from the pull-down lists.
7. Enter the desired offset time in the Offset(minutes) field.
8. Click Confirm to accept the change.
Configuring Basic Features
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