AT&T MERLIN LEGEND Release 4.0 Feature Reference page 80

Feature Reference
Display
Do Not Disturb
Forward and
Follow Me
Group Calling
Headset Options
Messaging
Paging
Privacy
80
Barge-In
Barge-In appears on the display as a feature choice only on QCC
operator consoles. On an MLX display telephone receiving a Barge-In
call, the message
the person joining the call remains on the display until the receiving
telephone user hangs up. If Barge-In is denied because Privacy has
been activated, no error message is displayed on the calling telephone
to indicate that the attempt was unsuccessful.
If Do Not Disturb is activated, Barge-In overrides the feature and makes
the telephone ring.
If an operator uses Barge-In to call an extension with Call Forwarding or
Remote Call Forwarding, the call from the operator is not directed to the
destination extension. When a forwarded call is answered at the
destination extension, Barge-In can be used to join the call only by
dialing the extension number for the destination extension (not the
number for the originating extension). Barge-In cannot be used to join a
call forwarded to an outside telephone number.
Barge-In can be used for calling group members, but the member's
extension must be used instead of the calling group extension. If a user
tries to use Barge-In after dialing the calling group extension number
and waiting in the queue, the feature has no effect. If a person uses
Barge-In to reach another user who is waiting in a calling group queue,
the call is removed from the queue and both people and the delay
announcement, if programmed, are connected. If a person uses
Barge-In for the delay announcement extension and the device is
playing a message to a caller, the call is removed from the queue and
both people and the delay announcement are connected.
If Barge-In is used to contact a user with Headset Auto Answer, the call
is automatically answered.
If Barge-In is used to contact a user with a posted message, the caller's
telephone does not display the posted message.
Barge-In cannot be used to join speakerphone or loudspeaker paging
calls.
Barge-In does not override Privacy. The caller hears a busy signal.
All VMI ports always have Privacy on. Barge-In can not be used to join
calls to VMI ports.
and either the name or extension number of