Gigaset DE900 IP PRO / en / A31008-M2210-R101-5-7619 / glossary.fm / 17.09.2012
PRO Version 3, 30.05.2012
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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.
