AT&T MERLIN LEGEND Release 4.0 Feature Reference page 133

Feature Reference
A single-line telephone user can drop the most recently added participant from
the conference by pressing and releasing the Recall or Flash button or
switchhook.
If a single-line telephone with a timed or positive disconnect (for example, AT&T
model 2500YMGK, 2500MMGK, or 8110M) is used, pressing the switchhook
disconnects the call. With this type of telephone, the Recall or Flash button
must be used instead of the switchhook to add a conference participant or drop
the most recently added conference participant. (The 8100M telephone must
have positive disconnect programmed on the telephone as described in its
manual.)
Feature Interactions
Account Code Entry
Allowed Lists
Authorization Code
Auto Dial
Barge-In
Basic Rate Interface
A separate account code must be entered for each outside call added
to the conference.
A user with an outward-restricted extension cannot add an outside
participant to a conference unless the participant's number is on an
Allowed List assigned to the extension. A user with a toll-restricted
extension cannot dial a toll number to add a participant unless the
participant's number is on an Allowed List assigned to the extension.
Enter an authorization code before each outside call for a conference is
made.
You may enter a different authorization code for different outside calls if
you wish. This may be useful if different restriction privileges are
required for different outside calls for the conference.
When programming an Auto Dial button, press the Conf button to enter
the Flash special character in a telephone number programmed on an
Auto Dial button. Press the Drop button to enter the Stop special
character in a telephone number programmed on an Auto Dial button.
Barge-In can be used to interrupt conference calls; all participants hear
the Barge-In tone. Barge-In, however, does not connect the user to a
conference call if the conference already has the maximum number of
participants. If Barge-In is used to connect to a conference call that
involves an outside trunk and the person on the outside trunk hangs up,
the person using Barge-In is also dropped.
Calls on BRI lines can be part of a conference call processed by the
MERLIN LEGEND system, not by the central office (CO). The MERLIN
LEGEND system determines the number of active parties on the call.
The MERLIN LEGEND Communications System supports up to five
people on a conference: two within the system, two outside the system,
and the call originator.
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Conference