Avaya IP Telephony Guía de configuración Pagina 205

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Glossary 205
IP Telephony Configuration Guide
feature labels
The names that appear beside the four/six soft keys on Nortel IP telephones can be
adjusted to better reflect local requirements. Label changes are performed through the
Unified Manager.
firewalls
Firewalls are server security devices on a network that block or allow IP traffic into node
networks or devices. When configuring IP telephony, you need to ensure that the port
settings are correctly configured to pass through any network firewalls between the
telephone and the Business Communications Manager.
full-duplex transmission
Simultaneous two-way separate transmission in both directions.
G.711
For IP telephones, the Business Communications Manager supports both a-law and
mu-law variants of the G.711 CODEC.
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.
Codecs with VAD (Voice Activity Detection) make VAD active on the system, which
performs the same function as having silence suppression active.
G.729
A codec that provides near toll quality at a low delay. Uses compression to 8 kbit/s (8:1
compression rate).
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%.
Codecs with VAD (Voice Activity Detection) make VAD active on the system, which
performs the same function as having silence suppression active.
G.723
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.
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.
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