Siemens Gigaset A580 User Manual page 177

Glossary
Data transmission is a mode in which data can be sent and received at the same
Full duplex
time.
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 connection, but the delay caused by coding/decoding is only
0.125 ms.
"a law" describes the European standard and "µ law" describes the North Amer-
ican/Japanese equivalent.
Standard for a Codec.
G.722
G.722 is a broadband language codec with a bandwidth of 50 Hz to 7 kHz, a
net transmission 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 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 better than with G.729.
Standard for a Codec.
G.729A/B
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.
Connects two different Networks, e.g. a router as an Internet gateway.
Gateway
For phone calls from
nected to the IP network and the telephone network (gateway/VoIP provider).
It forwards calls from VoIP to the telephone network as required.
Gateway provider
£
SIP provider.
Global IP address
£
IP address.
GSM
Global System for Mobile Communication
Originally, a 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.
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VoIP to the telephone network, a gateway has to be con-