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