Yealink SIP-T2 SERIES Administrator's Manual page 152

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
2. Select Enabled from the pull-down list of Power Saving.
3. Click Confirm to accept the change.
To configure the office hour via web user interface:
1. Click on Settings->Power Saving.
2. Select a desired day of the week.
3. Enter the starting time and ending time respectively in the desired day field.
4. Click Confirm to accept the change.
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