Nortel Networks 2002 - Manual (Page 140)

Terms you should know
140
Directory Number (DN)
A number consisting of one to seven digits for a telephone. Also
known as an extension number.
Expand to PC
A fixed key on your telephone reserved for future feature
development. An audible non-working tone is generated along
with a display message “Service not available” if this key is
pressed.
Fastbusy
A signal given when all outgoing lines are busy.
Feature display
An area that shows status information about the feature in use. It
also displays the name and status of the active session.
Fixed key
The hard-labeled keys on your telephone.
Flexible Feature Codes (FFCs)
Specialized codes entered using the dialpad that enable features
(for example, Automatic Wake-Up call).
Goodbye key
A fixed key used to end an active call.
Handsfree
A method of conversing with the party on the other end of the line
without lifting your handset.
Headset key
A fixed key used to answer a call using the headset.