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Glossary
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Using a Virtual Private Network it is possible to use all net-
work applications of the company network even from distant
locations. This means it is possible to use the advantages of
the network even over large geographical distances.
VPN facilitates optimum information flow without delay
throughout the entire company, even to offices in other loca-
tions. E-mail servers, file sharing and other central applica-
tions of the company network can thus be made available via
VPN even to distant branch offices, subsidiaries and home of-
fices. With VPN, field representatives of a company can also
be granted secure access to the company network.
VoIP
abbreviation for Voice over IP, also known as Internet telephony
Voice over IP makes telephone calls possible via the Internet.
The technology has already been in use for years, but today it
allows even private customers the convenience familiar from
conventional telephony, usually at significantly lower prices.
VoIP has also made it considerably more convenient to use
applications like conference calls and answering machines in
networks. Added to this are global accessibility under a sin-
gle telephone number and new VoIP features like the Buddy
List known from chat rooms.
Internet telephony used to be possible only with a headset
connected to the computers of the callers and their conversa-
tion partners. Today voice connections via the Internet, even
to fixed-line and mobile networks, can be conducted conve-
niently using VoIP telephone systems that allow already exist-
ing analog telephones to be used even when the PC is
switched off. Various Internet Service Providers and telepho-
ny carriers provide SIP-fixed-line gateways for this purpose.
Such a gateway is used to produce voice connections be-
tween the Internet and conventional telephone networks. In
principle VoIP conversations are possible via every Internet
access point, but for convenient use with existing terminal
equipment, and for conversations with the fixed-line and mo-
bile networks, it is important that the Internet provider sup-