AT&T MERLIN LEGEND Release 4.0 Feature Reference page 129

Feature Reference
dropped. Single-line telephone users can drop the most recently added
participant from the conference by issuing a switchhook flash.
Leaving a Conference
The conference originator can leave the conference by pressing the Hold
button (the conference continues). If a conference originator (excluding a QCC
operator) leaves a conference by either hanging up or selecting another line,
the entire conference is disconnected.
Considerations and Constraints
Transmission quality may vary during the conferencing of outside lines.
A call to a busy number cannot be added to a conference.
Pressing the Drop button and the line button for a participant also disconnects
a participant who joined the conference by using a shared personal line or an
SA or ICOM button.
When a conference originator puts the conference on hold, Music On Hold is
not activated.
In Release 1.1 and later, the system automatically selects an SA or ICOM button
when the user presses the Conf button. In Release 1.0, the system does not
automatically select an SA or ICOM button; the user must select the line
manually.
In addition, beginning with Release 1.1, prompts help MLX display telephone
users set up conference calls. Pressing the Conf button causes one of the
following to happen:
If the system is in Hybrid/PBX mode and the user has an available SA
button, the system automatically selects one in the following order of
preference:
SA Originate Only (Ring)
SA Originate Only (Voice)
SA Ring
SA Voice
!
Security Alert:
If the system selects a voice button, the caller hears a beep instead
of ringing. If a person does not answer at the destination extension
and the originator completes the conference, the conversation of
the other parties is broadcast on that extension's speaker. The
originator must be sure to drop the unanswered destination
extension on a voice button to prevent this from happening.
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Conference