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Glossary
Gigaset C470-475 IP / EN for IM-Ost / A31008-xxxx-xxxx-x-xxxx / glossary.fm / 16.8.07
Version 2.1, 08.01.2007
G.722
Standard for a Codec.
G.722 is a broadband language codec with a bandwidth of 50 Hz to 7 kHz, a net trans-
fer rate of 64 kbit/s per language connection and integrated speech pause recognition
and comfort noise generation (silence suppression).
G.722 delivers very good voice quality. A higher sampling rate provides clearer and bet-
ter voice quality than other codecs and enables a speech tone in High Definition Sound
Performance (HDSP).
G.726
Standard for a Codec.
G.726 delivers a good voice quality. It is inferior to the quality with codec G.711 but bet-
ter than with G.729.
G.729A/B
Standard for a Codec.
The voice quality is rather lower with G.729A/B. As a result of the high level of compres-
sion, the necessary bandwidth is only around 8 kbit/s per voice connection, but the
delay is around 15 mins.
Gateway
Connects two different Networks, e.g. a router as an Internet gateway.
For phone calls from VoIP to the telephone network, a gateway has to be connected to
the IP network and the telephone network (gateway/VoIP provider). It forwards calls
from VoIP to the telephone network as required.
Gateway Provider
See SIP provider.
Global IP Address
See IP address.
GSM
Global System for Mobile Communication
Originally, European standard for mobile networks. GSM can now be described as a
worldwide standard. In the USA and Japan national standards are now more frequently
supported than in the past.
H
Headset
Combination of microphone and headphone. A headset makes handsfree talking more
comfortable. There are headsets available that are connected to the handset by a cable.
HTTP Proxy
Server via which the Network subscribers can process their Internet traffic.
Hub
Uses one Infrastructure network to connect several Network subscribers. All data
sent to the hub by one network subscriber is forwarded to all network subscribers.
See also: Gateway, Router.
VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
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