Panasonic KX-T336 System Reference Manual page 597

6.00 Do Not Disturb (DND)
Override
Description
Do Not Disturb Override allows an extension to
call another extension which has set Do Not
Disturb.
Dialing "1" after hearing DND tone provides
calling the extension.
Refer to Section 4-D-6.00 "Do Not Disturb
(DND)" for further information about DND feature.
To activate this function, assign "System-Class of
Service", Do Not Disturb Override to "Yes" at
overriding extension.
Programming
System Programming
"System-Class of Service (1/2)",
Do Not Disturb Override
Conditions
Make sure to dial "1" within 10 seconds after
hearing DND tone to execute Do Not Disturb
Override.
When dialing "1," if the other extension is busy,
the caller hears busy tone. In this case, it is
possible to assign Automatic Callback-
Station.For Automatic Callback-Station, refer to
Section 5-A-4.02 "Automatic Callback-Station."
If "System-Class of Service," Do Not Disturb
Override is set to "No," the caller hears reorder
tone after dialing "1" and cannot call the other
party.
Reference
VT Dumb
9-D-4.01 10-C-7.00
5-A-15
Operation
1. Lift the handset.
• You hear dial tone 1 or 3 or 4.
2. Dial the directory number of the
other extension.
• If the other extension sets DND
(Do Not Disturb), you hear
DND tone.
3. Dial "1."
• You hear ringback tone.
• Calling the other party starts.