Yealink SIP-T4X Administrator's Manual page 62

Administrator's Guide for SIP-T4X IP Phones
To configure phone lock via web user interface:
1. Click on Features->Phone Lock.
2. Select the desired type from the pull-down list of Keypad Lock Enable.
3. Select the desired type from the pull-down list of Keypad Lock Type.
4. Enter unlock password (numeric characters) in the Phone Unlock PIN (0~15 Digit)
field.
5. Enter the desired time in the Phone Lock Time Out (0~3600s) field.
6. Click Confirm to accept the change.
To configure a keypad lock key via web user interface:
1. Click on DSSKey->Line Key.
2. In the desired DSS key field, select Keypad Lock from the pull-down list of Type.
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Assign a keypad lock key.