AT&T CL82351 - Manual (Page 61)

Answering system
55
Base message counter displays
The base message counter shows the total number of answering system
messages. See the table below for other message counter displays.
Message counter displays
0
No messages.
0 (flashing)
You need to set the clock (page 12).
1-99
Total number of old messages and memos, or message
number currently playing during old message playback.
1-99 (flashing)
Total number of messages and memos. The number
flashes when there are new or missed messages.
After a power failure, the number in the message counter
flashes to indicate that you need to set the clock.
1-99 & F (alternating)
Memory is full. You must delete some messages before
recording new messages.
- -
The system is answering a call, or someone is trying to
reach it remotely.
The system is in program mode.
0-6
Shows for 2 seconds while adjusting the telephone base
ringer volume.
1-8
Shows for 2 seconds while adjusting the telephone base
speaker volume.