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IP Telephony Configuration Guide
Glossary
backbone
A network’s major transmission path, handling high-volume, high-density traffic.
bandwidth
A measure of information carrying capacity available for a transmission medium, shown
in bits per second. The greater the bandwidth, the more information sent in a given amount
of time.
bridge
LAN equipment providing interconnection between two networks using the same
addressing structure. A bridge filters out packets that remain on one LAN and forwards
packets for other LANs.
codec
Equipment or circuits that digitally code and decode voice signals
communications protocol
A set of agreed-upon communications formats and procedures between devices on a data
communication network.
data communications
Processes and equipment used to transport signals from a data processing device at one
location to a data processing device at another location.
enbloc
All dialed digits sent in a single expression. The system waits for all digits to be dialled
before processing the call.
full-duplex transmission
Simultaneous two-way separate transmission in both directions.
G.711
A codec that delivers “toll quality” audio at 64 kbit/s. This codec is best for speech
because it has small delay, and is very resilient to channel errors.
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.
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