AT&T System 25 - Manual (Page 64)

PersonaI Message Waiting ❑
You and another person may have been assigned buttons that
are used to signal each other. If so, a message waiting is
indicated by the light next to
MSG WAIT
. Either the sender or
the receiver can turn this light off.
Sending a Personal Signal
1 Do not lift the handset.
2 If the light next to the button is off, press
MSG WAIT
.
Canceling a Personal Signal
1 Do not lift the handset.
2 If the light next to the button is on, press
MSG WAIT
.
60