AT&T MERLIN LEGEND Release 4.0 Feature Reference page 350

Feature Reference
Considerations and Constraints
In Release 2.0 and later, if a user at an analog multiline or MLX-10 telephone
has a programmed Posted Message button and the Do Not Disturb feature is
turned on, the system automatically posts the Do Not Disturb message for
callers with display telephones. The programmed button is not required at MLX
display telephones. When the feature is turned off, the message is canceled.
However, posting or canceling the Do Not Disturb message does not turn the
feature on or off.
A user does not need a display telephone to use the Leave Message feature,
but the person to whom the message is sent must have a display telephone.
Unlike Send/Remove Message, when the Leave Message feature is used to
send a message to a person whose Message LED is on, the LED is not turned
off even if the caller is an operator.
If an operator uses the Send/Remove Message feature while on a call, only an
inside caller hears the touch tones; an outside caller does not. If 10 messages
have been stored and a user tries to send an eleventh message, the caller
hears a beep and display telephones show
Responding to messages by using Return Call does not delete the message.
The user must delete all messages before the Message LED turns off. A fax
machine can send the message-waiting indication, but a fax machine cannot be
assigned as a message-waiting receiver for another fax or for a calling group.
If a fax message-waiting indication is deleted by one of the four
message-waiting receivers, the message is deleted from all analog multiline
display telephones programmed as a message-waiting receivers for the fax, but
the message is not deleted from MLX display telephones programmed as
message-waiting receivers for the fax.
Each calling group can have only one extension assigned as its
message-waiting receiver, but the same extension can be assigned as the
message-waiting receiver for more than one calling group.
Messages can be posted only by using a programmed button or, for MLX
display telephone users, by selecting the feature from the display.
A single-line telephone user cannot post a message.
When a user posts a nonexistent message
(A message has not been programmed for this message number by the system
manager.)
Posted messages are only seen by multiline display telephone users. Users with
single-line telephones or multiline telephones without a display cannot receive a
message posted by another user.
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Messaging
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is displayed.