Panasonic KX-T336 System Reference Manual page 434

FWD/DND Button
This button can be used for setting or canceling the Call Forwarding or Do Not
Disturb feature.
CONF Button and Indicator
Allows the user to perform a three party conference.
FLASH Button
This button causes a flash signal to be sent to the Central Office.
MESSAGE Button and Indicator
This button can be used for Message Waiting feature.
4-B-3