Conference Calls; Call Forwarding / Do Not Disturb (Fwd/Dnd); Forward Busy/No Answer Calls To Voice Mail (Default) - Panasonic KX-NT6 Series User Manual

ON (button is lit red) – Intercom calls to your extension
will beep then the calling party will talk live through your
speakerphone and you can answer back handsfree.
OFF (button is not lit) – Intercom calls to your extension
will ring your phone and you will have to lift the handset or
press SP-PHONE to receive the call.

Conference Calls:

This feature allows you to create a three party Conference
Call. This can be comprised of two outside lines and one
internal extension, or two internal extensions and one
outside line. It is limited to three parties total.
With your first caller live on the line –

Call Forwarding / Do Not Disturb (FWD/DND):

This feature allows you to forward your calls to another extension,
to voice mail or to turn on Do Not Disturb at your extension.
NOTE: The default setting for the phone is Forward Busy/No
Answer Calls to Voice Mail. If you forward your calls to another
extension or turn on Do Not Disturb at your extension, you MUST
reprogram your phone back to Forward Busy/No Answer Calls to
Voice Mail to have your extension function properly.

Forward Busy/No Answer Calls to Voice Mail (DEFAULT):

When your phone is idle (leave the handset in the cradle) –
INTERCOM