Gigaset DE700 IP PRO / en / A31008-M2211-R101-4-7619 / glossary.fm / 05.09.2012
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Glossary
G
G.711 a law, G.711 μ law
Standard for a
codec
.
G.711 delivers a very good voice quality that corresponds to that in the ISDN fixed line. As
there is little compression, the necessary bandwidth is around 64 kbit/s per voice connec-
tion, but the delay caused by coding/decoding is only approx. 0.125 ms.
"a law" describes the European standard and "μ law" describes the North American/Japa-
nese equivalent.
G.722
Standard for a
codec
.
G.722 is a
broadband
language codec with a bandwidth of 50 Hz to 7 kHz, a net transmis-
sion 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 better
voice quality than other codecs and enables a speech tone in High Definition Sound Per-
formance (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 better
than with
G.729
.
G.729A/B
Standard for a
codec
.
The voice quality is more likely to be lower with G.729A/B. As a result of the high level of
compression, the necessary bandwidth is only around 8 kbit/s per voice connection, but
the delay is around 15 ms.
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, a European standard for mobile networks. GSM can now be described as a
worldwide standard. However, in the USA and Japan, national standards were previously
more frequently supported.
