AT&T 2256 - Manual (Page 24)

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BASE LIGHTS
LIGHT: STATUS: INDICATES:
ON/OFF on Answering system is on
ON/OFF off Answering system is off
CHARGING on Handset is in the base
charging
IN USE on Handset is on a call
IN USE flashing Phone line is disconnected
IN USE fast flash Handset registration is in
progress
MAILBOX/STOP on Old messages only in this
mailbox
MAILBOX/STOP flashing New messages in this
mailbox
MAILBOX/STOP off No messages in this mailbox