Yealink SIP-T2XP Administrator's Manual page 70

Administrator's Guide for SIP-T2xP and SIP-T19P IP Phones
If you select Enabled, do one of the following:
Mark the DST By Date radio box in the Fixed Type field.
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Enter the start time in the Start Date field.
Enter the end time in the End Date field.
Mark the DST By Week radio box in the Fixed Type field.
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Select the desired values from the pull-down lists of DST Start Month, DST Start
Day of Week, DST Start Day of Week Last in Month, DST Stop Month, DST Stop
Day of Week and DST Stop Day of Week Last in Month.
Enter the desired time in the Start Hour of Day field.
Enter the desired time in the End Hour of Day field.
7. Enter the desired offset time in the Offset (minutes) field.
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