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Chapter 4 –
Conference Profiles
4-6
Parameter Description of Advanced Options
Parameter
Description
Lost Packet Recovery
Lost Packet Recovery (LPR) is an algorithm designed to
protect IP video calls against the impact of network packet
loss. This option is enabled by default. In case of packet
loss during network transmission, if the endpoint also
supports and has packet recovery function enabled, the
packet recovery mechanism will be automatically
activated. This function can effectively improve the
decreased video quality caused by packet loss.
Enable I Frame
Suppression
In the event of severe packet loss, the endpoint will
frequently send I frame requests to MCU and this will affect
the conference's graphic effects. When the I frame
suppression function is enabled, MCU's I frame response
to the endpoint can be reduced. To enable this option, you
need to enter the I frame suppression interval, that is, how
often MCU responds to an I frame request.
People video
adjustment
When an endpoint's setup sends video-source resolution
that does not match the resolution for conference
multi-screen panes, the method used to display video
graphics in panes:
• None: keep the screen width/height ratio for a source
video. The video will be adjusted without cropping to the
maximum supportable resolution suitable for a pane if
necessary. Any remaining space between the video and
the pane is filled with black.
• Zoom: keep the screen width/height ratio for a source
video. The image will be adjusted to accurately match
one of the orientations of the pane dimension, and at the
same time match or exceed another orientation of the
pane dimension. The image will be centered by way of
cropping.
Allows you to configure
an endpoint from the
conference list to
automatically join a
conference from the
lobby
When this option is enabled and an endpoint is being
dialed into the lobby, the endpoint will join a conference
automatically if it has been defined in the invited participant
list of the active conference.
Instruction
: if an endpoint is defined in the invitation list of
multiple currently running conferences at a time, the
system will add the endpoint to the earliest held conference
based on the conference creation time.
Cascading mode
This option can only be used to set the master-slave
strategy for cascading devices when multiple RMX devices
are cascaded.
• Root cascading: this option can be selected only if a
device is in the uppermost position of cascaded topology.
When this option is enabled, conferences using this
profile can appoint dual stream senders when they are
held. For more information, see Specify the Dual Stream
Sender in a Cascading Conference
.
• Slave cascading: this option can be selected only if a
device is in the slave position of cascaded topology. This
function is used to enhance the video quality received by
slave devices during cascading. When this option is
enabled, a conference held on the slave device will be
automatically set to Lecture mode, with the master
device being set as the lecturer so that the slave device
can send video from the conference endpoints or receive
video from the master device side.