Maintenance Manual

have in common that all of their panes, whether big or small, have the same aspect ratio as the view itself. That is,
the panes' widths and heights are in the same proportion as the width and height of the encompassing view.
By comparison, there are some defined conference layouts, for example:
in which this aspect ratio preservation does not occur. In these cases, the MCU scales the participant video stream
according to the larger dimension of the pane.
For example, in the layout to the left, the size of the top left pane is one half of the view width and two thirds of the
view height. Because two thirds is greater than one half, the MCU scales the participant video stream to two thirds of
its size and thus a small amount of the left and right of the original image will not appear in the final composed layout.
Video Stream vs. Fixed Bitmap Images
For video conference participants, the image that displays in the layout view pane is either the live video stream (if
viewing from the video endpoint) or a captured video image from the current video stream (if viewing from the web
interface).
However, audio-only participants do not have any associated video to display. Instead, you can assign a fixed image
(in bitmap format) to a specific participant. When the participant joins a conference as an audio-only participant, this
image appears in the layout pane. To enable this feature, the participant must be added as a user to the MCU, have
an associated E.164 telephone, and have a designated image file uploaded. See Adding and updating users.
Muted Participants
Audio Mute
Participants who have had their audio muted from the web interface do not contribute audio to the conference.
Additionally, muted participants are not considered when the MCU calculates the loudest speakers to display in the
largest panes, even if the participant had previously been in one of those positions.
Note that other participants will not have an indication that a participant has been muted. They simply will no longer
hear that participant speaking.
Video Mute
Participants who have had their video muted from the web interface do not contribute video to the conference. They
will continue to contribute audio as normal, unless it is muted separately.
Automatic Lecture Mode
Automatic lecture mode allows a lecturer to be shown in full-screen view to the students. In this mode, the lecturer
will continue to see the normal (continuous presence) view. That is, the lecturer will see the students and not himself.
When Automatic lecture mode is enabled for a conference, the MCU identifies the loudest speaker as the lecturer. If
you have configured a custom layout for the lecturer, that will override the normal continuous presence view. For the
other participants (the students), the view of the lecturer (the loudest speaker) overrides any custom layout. You can
enable automatic lecture mode for scheduled and/or ad hoc conferences either in the conference configuration or in
the relevant conference template.
See Adding and updating conferences for details of how to configure automatic lecture mode.
H.243 Floor and Chair Control
Some H.323 endpoints support a feature known as floor and chair control that is encompassed by the H.243 protocol.
This is not currently supported by SIP.
The MCU supports the following H.243 features:
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