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IP Telephony Configuration Guide

Glossary

access point (802.11b)

This is a piece of hardware using either IEEE 802.11 (1 or 2 M-bits/sec, Frequency

Hopping Spread Spectrum) or IEEE 802.11B (11 M-bits/sec, Direct Sequence Spread

Spectrum) technology, that connects to the internet and acts as a wireless gateway for

devices to connect to the internet. In the context of the Business Communications

Manager, this is the device that the NetVision handset uses to connect to the LAN to

which the Business Communications Manager is connected.

backbone

The major transmission path of a network, 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. Software that provides

compression/decompression algorithms for voice traffic over IP networks and VoIP

trunks.

For IP telephones, the Business Communications Manager supports both a-law and

mu-law variants of the G.711 CODEC, as well as the G.729 and G.723 CODECS.

The G.711 CODEC samples the voice stream at a rate of 64Kbps (Kilo bits per second),

and is the CODEC to use for maximum voice quality. Choose the G.711 CODEC with the

companding law (alaw or ulaw) that matches your system requirements.

The G.729 CODEC samples the voice stream at 8Kbps. The voice quality is slightly lower

using a G.729 but it reduces network traffic by approximately 80%.

The G.723 CODEC should be used only with third party devices that do not support G.729

or G.711.

Codecs with VAD (Voice Activity Detection) make VAD active on the system, which

performs the same function as having silence suppression active.

Note: You can only change the codec on a configured IP telephone if it is online to the

Business Communications Manager, or if Keep DN Alive is enabled for an offline

telephone.

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Avaya IP Telephony Guía de configuración Pagina 203