Yealink SIP-T56A User Manual page 270

Smart Media Phone
User Guide for SIP-T56A
(Optional.) Enter the DND on code or off code respectively in the On Code or Off Code
4.
field.
Tap to accept the change.
5.
If you enable DND for the default account, the associated line icon will change to
icon will appear on the status bar.
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, and the