AT&T MERLIN LEGEND Release 4.0 Feature Reference page 354

Feature Reference
Signaling
System
Access/Intercom
Buttons
Transfer
Voice Messaging
Interface (VMI)
354
Messaging
If a display telephone user presses only a Signaling button to send an
audible signal to an extension with a posted message, the posted
message at the destination is not shown on the display. However, if a
display telephone user selects an SA or ICOM button, lifts the handset,
and uses the Signaling button to dial the extension, the posted
message is shown.
When a Shared SA button is used to leave a message for a display
user, the extension shown is that of the telephone with the Shared SA
button and not that of the principal owner. When a principal extension
owner with an MLX display telephone posts a message and a call is
answered at the Shared SA button, the Home screen on which the
posted message was previously shown is not restored. If the principal
owner presses the Home button or makes or receives a call, the Home
screen is restored.
A nondisplay telephone user who sends a message by using Leave
Message while a transfer to another telephone is in progress cannot
determine who received the message. For example, suppose Extension
A calls Extension B and Extension B transfers the call to Extension C. If
Extension A sends a message before the transfer is complete,
Extension B receives the message. If Extension A sends a message
after Extension B completes the transfer, Extension C receives the
message, even if Extension C does not answer and the call is ringing at
Extension B as a transfer return.
If an inside call is transferred to an extension with a posted message,
only the display telephone user who transfers the call, and not the
original caller, sees the posted message, even after the transfer is
completed.
If a call is transferred to an extension programmed as a fax extension,
the message indication is not sent to the fax message-waiting receiver
regardless of the amount of time programmed for the fax message
threshold.
In Release 2.0 and later, when using the Return Call feature for a voice
messaging system, a call is returned to the voice messaging system,
not to the specific VMI jack that sent the message-waiting code.