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Do not disturb: A mode that disables incoming call ringing
and intercom calling.
Dual Tone Multiple Frequency (DTMF): The tones made by
your telephone when you dial.
Dynamic line button: System temporarily assigns a normally
unassigned line to an idle line button for certain call handling
operations.
E
Exclusive hold: Only the telephone placing the call on hold
can retrieve it.
Executive override: Breaking into a conversation at a busy
called telephone. This intrusion is announced by several quick
tone bursts over the conversation.
H
Handsfree answer inhibit: A telephone can be set to block
voice calls sent to it over the speaker.
Hookflash: Action that occurs when the TAP button is
pressed. Needed for activating host system features.
Hookswitch: The switch on a telephone which, when
depressed manually or by the handset, disconnects a call.
K
Keypad: Buttons 0 through 9, +# and # used for dialing.
L
Last number redialing: Automatically dialing the last num-
her dialed.
M
Messaging: Turning on a telephone lamp to let the user know
that a message awaits pickup and leaving a message on the dis-
play of a telephone that gives information on your status.
Mute: A fixed feature button that keeps a distant party from
hearing your conversation. This button also lets you adjust the
telephone display contrast from light to dark.
N
Night transfer: Transferring incoming calls to a particular sta-
tion(s) for off-hour answering.
P
Personal ringing tones: A telephone can be arranged to ring
in one of six distinctive tones.
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