zooming, where you can pan up to the width or length of the original
camera image.
Q.931 Q.931 is a telephony protocol used to start and end the connection in H.323
calls.
QCIF QCIF, or Quarter CIF, defines a video resolution of 176 × 144 pixels (PAL)
or 176 x 120 (NTSC). It is often used in older mobile handsets (3G-324M)
limited by screen resolution and processing power.
Quality of Service
(QoS)
Quality of Service (QoS) determines the priorities of different types of
network traffic (audio, video and control/signaling), so in poor network
conditions, prioritized traffic is still fully transmitted.
Recordings A recording of a videoconference can be played back at any time.
Recordings include audio, video and shared data (if presented). Users can
access recordings from the Scopia Desktop web portal or using a web link
to the recording on the portal.
Redundancy
Redundancy is a way to deploy a network component, in which you deploy
extra units as 'spares', to be used as backups in case one of the
components fails.
Registrar A SIP Registrar manages the SIP domain by requiring that all SIP devices
register their IP addresses with it. For example, once a SIP endpoint
registers its IP address with the Registrar, it can place or receive calls with
other registered endpoints.
Resolution
Resolution, or image/video resolution, is the number of pixels which make
up an image frame in the video, measured as the number of horizontal
pixels x the number of vertical pixels. Increasing resolution improves video
quality but typically requires higher bandwidth and more computing power.
Techniques like SVC, H.264 High Profile and FEC reduce bandwidth usage
by compressing the data to a smaller footprint and compensating for packet
loss.
Restricted Mode
Restricted mode is used for ISDN endpoints only, when the PBX and line
uses a restricted form of communication, reserving the top 8k of each
packet for control data only. If enabled, the bandwidth values on these lines
are in multiples of 56kbps, instead of multiples of 64kbps.
Room System
A room system is a hardware videoconferencing endpoint installed in a
physical conference room. Essential features include its camera's ability to
PTZ (pan, tilt, zoom) to allow maximum flexibility of camera angles enabling
participants to see all those in the meeting room or just one part of the
room.
Q.931
August 2017 Installing the Avaya Equinox Streaming and Recording Server 93
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