Panasonic KX-NS1000 User Manual page 195

To set and clear FWD/DND for all calls
KX-UT113/KX-UT123/KX-UT133/KX-UT136/KX-UT248
While on-hook
Press the fixed
FWD/DND button.
FWD/DND Off : FWD/DND off
OR
Do Not Disturb : DND on
Press UP or DOWN with
the Navigator Key
to select the desired item.
1.9.2 Refusing Incoming Calls (Do Not Disturb [DND])
Press ENTER to set.
A confirmation tone will
be heard.
User Manual 195