AT&T SYSTEM 25 User Manual page 56

conference
confirmation
t o n e
data call (from
voice terminal)
DDC
DSS
exclusion
fast busy tone
(reorder tone)
feature access
c o d e
fixed button
fixed feature
HFAI
HFU
54
feature that allows you to have up to five
parties on a call.
three short tones, indicating that an
action was accepted and you can proceed.
feature that allows you to place a data
call from your voice terminal and then transfer
the call to your data terminal.
(Data Dial Code) extension number assigned
to a data terminal.
(Direct Station Selection) feature like automatic
intercom except that the person receiving the
call does not need a separate button. The call
comes in on a System Access button. Fixed
DSS buttons are programmed by the System
Administrator while you can program flexible
DSS buttons.
feature that allows you to keep others from
listening in on an outside call. Inside calls are
always private.
repeating on/off tone, indicating
that the dialed number or access code was
busy, misdialed, or restricted.
sequence of characters (digits, " * ", or
" # ") that allows you to access System 25
features.
button that has a fixed feature and label. It is
not changeable.
standard feature that is available to every voice
terminal.
(Hands-Free Answer on Intercom) feature that
provides automatic answering of internal calls;
name of a multiline voice terminal that
provides the HFAI feature.
(Hands-Free Unit) equipment that, when
attached to your voice terminal, allows you to
place and answer calls without lifting the
handset.