AT&T CL82351 - Manual (Page 67)

Appendix
61
Alert tones and lights
Lights
IN USE
On when the handset is in use, or when the answering system is
answering an incoming call.
On when a handset is being registered.
Flashes when there is an incoming call or when a handset is
being deregistered.
Flashes when another telephone is in use on the same line.
CHARGE
On when the
handset is charging
in the telephone
base or charger.
/SPEA�ER SPEA�ER
On when the
speakerphone is on.
Lighted display
Lighted key pad
/ANSWER ON
On when the answering
system is on.