RADVision L2W-323, User Manual

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Glossary
Glossary-3
DTMF
Dual Tone Multi-Frequency signals are the type of audio signals used in telephony for tone
dialing.
E1
The European interface for PRI ISDN lines. An E1 connection has up to 30 B channels and
1 D channel, which transmits at rates of up to 2.048 Mbps.
endpoint
An H.323 terminal, gateway or Multipoint Controller Unit (MCU). An endpoint can call or
be called and it can generate or end information streams.
far end camera control (FECC)
FECC is the mechanism that enables you to control the movement and direction of the
camera of the remote H.320 room system.
G.711
An ITU standard for speech codecs that provides toll quality audio at 64 Kbps using the
PCM method and either
µ
-law or A-law.
G.723.1
An ITU standard for speech codecs that provides toll quality audio at 5.3 or 6.4 Kbps using
the LD-CELP method.
G.728
An ITU standard for speech codecs that provides near toll quality audio at 16 Kbps, using
the LD-CELP method.
gatekeeper
The gatekeeper is an H.323 entity that provides address resolution, access control and other
services to endpoints on an H.323 network.
gateway hunting
The Gatekeeper’s ability to search for an available Gateway. When the Gatekeeper receives
a call request prefixed by a service supported by several Gateways, the Gatekeeper forwards
the call to the first available Gateway supporting the requested service.
group hunting
The Gatekeeper’s ability to search for an available terminal within a definition group of
terminals. Terminals can be defined as definition groups by registering with the Gatekeeper
as service providers.
H.320
The ITU standard for videoconferencing over digital networks such as ISDN.