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Glossary
Gigaset C470-C475 IP / GBR / A31008-M1916-L101-1-7619 / glossary.fm / 7.2.08
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Port forwarding
The Internet gateway (e.g. your router) forwards data packets from the
Internet
that are
directed to a certain
Port
to the port concerned. 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
Network subscribers
. 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 uniquely identifies the recipient or sender
of a data packet within a network.
Pre-dialling
See
Block dialling
.
Private IP address
See
Public IP address
.
Protocol
Describes the agreements for communicating within a
Network
. It contains rules for
opening, administering and closing a connection, about data formats, time frames and
possible error handling.
Proxy/Proxy server
Computer program that controls the exchange of data between
Client
and
Server
in
computer networks. If the phone sends a query to the VoIP server, the proxy acts as
a server towards the phone and as a client towards the server. A proxy is addressed via
IP address
/
Domain name
and
Port
.
Public IP address
The public IP address is the address for a network component on the Internet. It is
assigned by the Internet Service Provider. Devices that act as a link from a local network
to the Internet (gateway, router) have a public and a local IP address.
See also:
IP address
,
NAT
Q
Quality of Service (QoS)
Describes the Quality of Service in communication networks. Differentiations are made
between various Quality of Service classes.
QoS influences the flow of data packets on the Internet, e.g. by prioritising data packets,
reserving bandwidth and data packet optimisation.
In VoIP networks, QoS influences the voice quality. If the whole infrastructure (router,
network server etc.) has QoS, the voice quality is better, i.e. fewer delays, less echoing,
less crackling.
