AT&T 7720 - Manual (Page 46)

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SIGNALS AND DISPLAYS
Long ringing Incoming call
Single beep Valid button press
Three-part tone Page
Repeating three-part tone Handset locator
Two short beeps Handset is out of range
Four short beeps Low battery
Long buzzing tone Error—unsuccessful action
Series of ascending tones Action has been successful
CL You need to reset the clock
PH The phone is in use
– – System is taking a call or responding to
remote access
0 – 98 You have messages waiting
F, flashing Answering system memory is full
Counting 0 to 59 Shows time elapsed while recording an
announcement or memo
0 – 7 Indicates volume level selected
AP Announcement playback has been
selected
AO System is set to Announce Only
SA System is set to Toll Saver
CH You have pressed c
SU You have pressed U
Message Window Displays: When:
Sound: Meaning:
Audible Signals