AT&T CL4940 - Lights; Indicator Lights

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Appendix
Lights
Indicator lights
IN USE
On when the answering
system is answering an
incoming call.
Flashes quickly when there
is an incoming call.
ANS ON
On when the answering
system is on.
PLAY/STOP
On when the system is
playing messages.
Flashes when there are
new messages.
MUTE
On when the microphone
is muted.
SPEAKERSPEAKER
On when the
speakerphone is on.