Nortel VoIP Gateway, Configuration Manual

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212 Glossary
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G.729
A codec that provides near toll quality at a low delay. Uses compression to 8 kbit/s (8:1
compression rate).
G.723.1
A codec that provides the greatest compression, 5.3 kbit/s or 6.3 kbit/s. Normally used for
multimedia applications such as H.323 videoconferencing. Allows connectivity to
Microsoft-based equipment.
gatekeeper
A gatekeeper is server application on a network that tracks IP addresses of specified
devices to provide authorization for making and accepting calls for those devices. The
VoIP Gateway supports RadVision and CSE 1000 gatekeeper applications.
H.323
The ITU standard for multimedia communications over an IP network. The VoIP Gateway
supports H.323.
hop count
This is the number of routers the signal must go through to reach the destination device.
The more hops that are required, the more potential there is for voice quality issues to
arise.
hub
Center of a star topology network or cabling system.
IPT
This is the internet telephony gateway protocol for the Meridian 1 to VoIP Gateway
connections. VoIP trunks require compatible configuration at both endpoints. The VoIP
Gateway must be set to recognize that the other end of the trunk is an M1-IPT system.
jitter buffer
This is the process of collecting and organizing data frames at the receiving end to provide
balanced voice quality.
kbit/s
kilobits per second. Thousands of bits per second.
latency
The amount of time it takes for a discrete event to occur.
Mbit/s
Megabits per second. Millions of bits per second.