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AGC (Automatic Gain Control)
Automatic Gain Control (AGC) smooths audio signals through normalization, by lowering sounds which
are too strong and strengthening sounds which are too weak. This is relevant with microphones situated
at some distance from the speaker, like room systems. The result is a more consistent audio signal
within the required range of volume.
Auto-Attendant
Auto-Attendant, also known as video IVR, offers quick access to meetings hosted on MCUs, via a set of
visual menus. Participants can select menu options using standard DTMF tones (numeric keypad). Auto-
Attendant works with both H.323 and SIP endpoints.
Balanced Microphone
A balanced microphone uses a cable that is built to reduce noise and interference even when the cable
is long. This reduces audio disruptions resulting from surrounding electromagnetic interference.
BFCP (Binary Floor Control Protocol)
BFCP is a protocol which coordinates shared videoconference features in SIP calls, often used by one
participant at a time. For example, when sharing content to others in the meeting, one participant is
designated as the presenter, and is granted the floor for presenting. All endpoints must be aware that the
floor was granted to that participant and react appropriately.
Bitrate
Bitrate is the speed of data flow. Higher video resolutions require higher bitrates to ensure the video is
constantly updated, thereby maintaining smooth motion. If you lower the bitrate, you lower the quality of
the video. In some cases, you can select a lower bitrate without noticing a significant drop in video
quality; for example during a presentation or when a lecturer is speaking and there is very little motion. In
video recordings, the bitrate determines the file size for each minute of recording. Bitrate is often
measured in kilobits per second (kbps).
Call Control
See
Signaling
Cascaded Videoconference
A cascaded videoconference is a meeting distributed over more than one physical Scopia
where a master MCU connects to one or more slave MCUs to create a single videoconference. It
increases the meeting capacity by combining the resources of several MCUs. This can be especially
useful for distributed deployments across several locations, reducing bandwidth usage.
®
User Guide for Avaya Scopia
on page 30.
Elite 6000 Series MCU Version 8.3
®
Elite MCU,
®
Glossary of Terms for Scopia
Solution | 17
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