elmeg IP120 / en / elmegIP120_v1 / glossary.fm / 01.08.2012
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elmeg IP120
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Glossary
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 subscriber
Devices and PCs 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 a
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
PIN
Personal Identification Number
Protects against unauthorised use. When the PIN is activated, a number combination has to
be entered to access a protected area.
Port
Data is exchanged between two applications in a
network
across a port.
Port forwarding
The
Internet
gateway (e.g., your router) forwards data packets from the Internet to the
port
that the data is intended for. This allows servers in the
LAN
to offer services on the Internet
without you needing a public IP address.
Port number
Indicates a specific application of a
network subscriber
. Depending on the setting in the
LAN
, the port number is permanently assigned or else it is newly assigned with each access.
The combination of
IP address
/
port
number identifies the recipient or sender of a data
packet within a network.
Prepare dialling
See
Block dialling
.
Private IP address
See
Public IP address
.
Protocol
Describes the agreements for communicating within a
network
. It contains rules for open-
ing, administering and closing a connection, about data formats, time frames and possible
error handling.
