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Glossary
In principle, VoIP calls can be made over any Internet connec-
tion. However, for convenient use with existing terminal de-
vices, and for conversations with the fixed-line and mobile
communications networks, it is important that the Internet
service provider support what is known as the SIP standard.
SIP is the current standard defined for VoIP by the IETF (Inter-
net Engineering Task Force).
WLAN
short for Wireless Local Area Network
The term WLAN designates the industry standard for wireless
local networks passed by the Institute of Electrical and Elec-
tronics Engineers (IEEE) in 1997 under the title IEEE 802.11.
By means of WLAN technology, individual computers or net-
work devices like printers or DSL access points can be linked
wirelessly to an existing cable-connected local network (LAN),
or LANs can be converted completely to a wireless structure.
A further useful purpose for WLAN technology is to link seg-
ments of existing cable-connected networks.
Although WLAN was actually developed only for short-range
connections, by cascading WLAN base stations or implement-
ing transmission networks with high-power point-to-point ra-
dio transmission, even network segments located further
away from each other can be linked or network participants in
relatively remote locations can be economically and easily in-
tegrated into an existing network.
WLAN base stations often also serve as access points to the
Internet in private or public institutions. Many airports, hotels
and cafes, for instance, make WLAN hotspots available to
their customers, either free or subject to a charge. Ultimately
this has maneuvered WLAN into serious competition with mo-
bile UMTS technology.
The application possibilities for wireless network communi-
cation also overlap with Bluetooth technology. For mobile de-
vices with limited energy capacity Bluetooth is the more use-
ful solution, however, as Bluetooth uses considerably less
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