Siemens Gigaset S685 IP Manual page 255

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
approx. 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 transfer 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.
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
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
See SIP
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. However, national standards in the USA and Japan
had been more frequently supported up until now.
VoIP to the telephone network, a gateway has to be con-
provider.
Glossary
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