Panasonic KX-TD500 System Reference Manual page 745

5.00 Do Not Disturb (DND)
Override
Description
Do Not Disturb Override makes the attendant
possible to call the 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.
Programming
None
Conditions
If busy tone is heard after dialing "1", Executive
Busy Override can be done by dialing "1" again.
Operation
1. Dial the extension number.
• If DND feature is assigned to
2. Dial "1".
• Ringback tone sounds, and
(Supplement)
To transfer a call to extension which has DND
assigned.
<Example>
After answering an incoming CO call, to transfer
the call to an extension, dial the extension
number (the incoming call on SRC side is held,
on DES side DND tone is heard). Dialing "1"
cancels DND function temporarily, and while
hearing ringback tone, press the RELEASE key.
Then a call is transferred to the destination party.
6-D-17
the called extension, DND tone
sounds.
calling starts.