AT&T MERLIN LEGEND Release 4.0 Feature Reference page 348

Feature Reference
The type of message indicated does not allow a calling group message-waiting
receiver to distinguish between a message left for the calling group and a fax or
personal message.
Multiline telephone users without a display cannot use programmed message
buttons or feature codes to respond to messages. Normally, the Message LED
is turned off by the operator. However, an analog multiline telephone user
(excluding those with BIS-34 telephones) can turn off the Message LED by
pressing the associated Message button. Users of BIS-34 telephones or
MLX-10 telephones can turn off the LED by pressing the Feature button and
dialing .
Check with all message sources (system operator, fax, voice messaging) before
turning off the LED.
Fax Message-Waiting Receivers
The Fax Message-Waiting feature notifies designated extensions of the arrival of
fax transmissions. Up to four extensions can be programmed to receive
message-waiting indications when a fax transmission is received on a specific
fax machine. The Message LED goes on when the fax message threshold is
exceeded. The fax message threshold is the length of time (0–30 seconds)
before the system assumes that a fax has arrived.
Return Call is not operable for messages received from a fax machine and
cannot be used to make a call to the fax.
NOTE:
Fax machines can only send message-waiting indications. They cannot receive
message-waiting indications.
Calling Group Message-Waiting Receivers
An extension can be programmed as the message-waiting receiver for a calling
group. The user can receive personal messages or messages intended for the
calling group from any of the sources listed under "Receiving Messages."
Posted Messages
Users can post a message to provide special information to co-workers with
display telephones—for example, to tell callers where the person is when not
answering the telephone or why the person does not want to be disturbed.
When a user with a display telephone calls a co-worker who has a message
posted, the posted message is shown on the caller's display (even if the call is
answered). Users do not need a display telephone to post a message.
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Messaging