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Glossary
Gigaset C470-C475 IP / GBR / A31008-M1916-L101-1-7619 / glossary.fm / 7.2.08
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N
NAT
Network Address Translation
Method for converting (private)
IP addresss
to one or more (public) IP addresses. NAT
enables the IP addresses of
Network subscriberss
(e.g. VoIP telephones) in a
LAN
to be
concealed behind a shared IP address for the
Router
on the
Internet
.
VoIP telephones behind a NAT router cannot be reached by VoIP servers (on account of
the private IP address). In order to "get around" NAT, it is possible to use (alternatively)
ALG
in the router,
STUN
in the VoIP telephone, or for the VoIP provider to use an
Out-
bound proxy
.
If an outbound proxy is made available you must allow for this in the VoIP settings for
your phone.
Network
Group of devices. Devices can be connected in either wired or wireless mode.
Networks can also differ in range and structure:
– Range: local networks (
LAN
) or wide-area networks (
WAN
)
– Structure:
Infrastructure network
or ad-hoc network
Network subscribers
Devices and computers that are connected to each other in a network, e.g. servers, PCs
and phones.
O
Outbound proxy
Alternative NAT control mechanism to STUN and ALG.
Outbound proxies are implemented by the VoIP provider in firewall/NAT environments
as an alternative to
SIP proxy server
. They control data traffic through the firewall.
Outbound proxy and STUN servers should not be used simultaneously.
See also:
STUN
and
NAT
.
P
Paging
(handset search)
A base station function to locate registered handsets. The base station establishes a con-
nection to every registered handset. The handsets start to ring. Paging is activated by
briefly pressing the button on the base station and is deactivated by briefly pressing the
same button again.
PIN
Personal Identification Number
Protects against unauthorised use. When the PIN is activated a number combination has
to be entered in order to access a protected area.
You can protect your base station configuration data with a system PIN (4-digit number
combination).
Port
Data is exchanged between two applications in a
Network
via a port.