AT&T MERLIN LEGEND Release 4.0 Feature Reference page 352

Feature Reference
In either case, if the person's message box is full or the receiver is a single-line
telephone or a multiline telephone without a display, the caller hears a beep
indicating that the message was not left.
To cancel a message sent, lift the handset and dial
number where the message was left.
Single-line telephone users without a Message LED hear a stutter dial tone when
a message is waiting. A single-line telephone user cannot respond to messages
by using feature codes. Normally, if a single-line telephone has a Message LED,
it is turned off by the operator. However, a single-line user can turn off the
Message LED by lifting the handset and (while listening to inside dial tone)
dialing . Check with all message sources (system operator, fax, voice
messaging) before turning off the LED.
Non-display telephones
If a caller from a display set leaves a message to an extension that does not
have a display and there is no voice messaging system on the system, the
caller receives an error display. If there is a voice messaging system, the
Message LED of the receiving telephone turns on.
If a message is sent from a non-display MLX or non-display analog multiline
telephone to another non-display telephone, and there is no voice messaging
system connected to the communications system, then the caller hears an error
beep, and no message is sent. There is no error indication for a caller using a
single-line telephone, and no message is sent.
Feature Interactions
Barge-In
Directory
Direct Station
Selector
Display
352
Messaging
If Barge-In is used to contact a user with a posted message, the caller's
telephone does not display that message.
When an Extension Directory is used to call a co-worker with a posted
message, the posted message is not displayed on the caller's
telephone.
When an operator presses the Message Status button on a DSS
adjunct, the LEDs on the DSS reflect only messages left by an operator
using the Send/Remove Message feature and not messages left by any
user (including an operator) using the Leave Message feature.
When users try to send messages to an extension with a full message
box, they see
retrieve messages and the message box is empty,
appears on the display.
and the extension
on the display. When a user tries to