AT&T Definity ISDN 7507 - Manual (Page 52)

extension A dialing number of 3 to 5 digits assigned to each voice terminal connected
to your DEFINITY Generic 2.
feature A special function or service, such as Conference, Hold, Send All Calls, etc.
feature code A dial code of 1 to 4 digits, which you use to activate or cancel the
operation of a feature.
group list One of the 3 types of Abbreviated Dialing lists; programmable by the
System Manager or a controller of the list. Contains telephone numbers useful to
members of a specific group, and stored as a 1- or 2-digit list item, depending on the
number of members in the list.
handset The handheld part of the voice terminal which you pick up, talk into, and
listen from. Also known as the receiver.
message retriever A person authorized by the System Manager to retrieve messages
for other users.
off-hook When the handset is removed from the cradle (for example, when you lift
the handset to place or answer a call).
on-hook When the handset is left on the cradle.
party A person who places or answers a call.
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