AT&T CL83301 - Manual (Page 89)

Answering system
83
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.
1-99
Total number of messages and memos.
- -
The system is answering a call, or someone is trying to
reach it remotely.
The system is in program mode.