Polycom WEBCOMMANDER 8 - Manual (Page 163)

MGC WebCommander User’s Guide
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The display of the visual indications and voice messages can be configured
and set in the system.cfg. For a detailed description see the MGC Manager
Release Notes, version 8.0.
Enabling Visual Indications
Roll Call settings for the audio and voice indications apply to the visual
indications. The End Time Alert Tone alert settings for audio messages also
apply to visual indications.
The visual indications require Video+ and Audio+ cards in the MCU.
Text messages are available only in English.