Northern Telecom M5212 ACD General Description, Installation And Maintenance page 28

3-8 Operations and features
Table 3-2xxx
Headset Operations
Initial State
Idle or Active
Active
headset
Active
headset
Active
handset
Active
headset
297-2041-900 Standard 02.01 October 1991
Action Result
Insert headset Enable
Depress RELEASE Disable
(Rls) key
Lift handset Disable
handset/
mute
Depress MUTE key Mute
handset
micro-
phone
AC power failure Headset
disabled
Handset
enabled
Verification
Generates off-hook condition
(IN CALLS and Mute Handset
LCD indicators turn ON).
Generates release message.
Call disconnects.
Routes speech to handset.
Mute LCD indicator is winking.
Handset microphone is muted
for call monitoring only.
Depressing the MUTE button
turns off the LCD and the
muting of the handset
microphone.
Disables handset microphone,
but handset receiver remains
on. Microphone can be
restored by operating the
MUTE key again. The Mute
LCD indicator winks during
microphone muting; winking
stops if the MUTE key is
depressed again and LCD is
off. This Mute feature only
functions in handset mode,
disabling the mouthpiece
microphone (transmitter).
Lift handset and continue
conversation until power is
restored.