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Glossary
Gigaset DE310 IP PRO / en / A31008-M2218-L101-3-7619 / glossary.fm / 20.03.2012
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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 previ-
ously more frequently supported.
H
Headset
Combination of microphone and headphone. A headset makes using speaker mode
more convenient. Headsets that can be connected to the telephone via a cable are
available.
HTTP proxy
Server via which
network subscribers
can process their Internet traffic.
Hub
Connects several
network subscribers
in one
infrastructure network
. All data sent to
the hub by one network subscriber is forwarded to all network subscribers.
See also:
Gateway
,
Router
.
I
IEEE
Institute of Electrical and Electronics Engineers
International body that defines standards in electronics and electrical engineering,
concerned in particular with the standardisation of LAN technology, transmission pro-
tocols, data transfer rate and wiring.
Infrastructure network
Network with central structure: All
network subscribers
communicate via a central
router
.
Instant messaging
Service that uses a client program to allow chatting in real time, i.e., to send brief mes-
sages to other subscribers on the Internet.