174
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
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 (Internet Engineering
Task Force).
VPN
short for Virtual Private Network
VPN serves to integrate devices from a neighboring network
into your own network, without the networks having to be
compatible with each other.
A VPN is generally an independent company network distrib-
uted over several locations, which uses the infrastructure of a
public communications network to link its partial networks or
to link individual computers to the rest of the network. A VPN
uses tunneling technologies and typically builds on the infra-
structure of the Internet.
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.
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