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Glossary
Port Forwarding
The Internet gateway (e.g. your router)
forwards data packets from the Inter-
net that are directed to a certain Port
to the port concerned. This allows serv-
ers 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 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 identifies the recipient or
sender of a data packet within a net-
work.
Pre-dialling
See Block dialling.
Private IP Address
See Public IP address.
Protocol
Describes the agreements for commu-
nicating within a Network. It contains
rules for opening, administering and
closing a connection, about data for-
mats, 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 the
IP address/Domain name and Port.
88
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 (gate-
way or 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 com-
munication 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, bandwidth reservation and
packet optimisation.
In VoIP networks, QoS influences the
voice quality. If the whole infrastruc-
ture (router, network server etc.) has
QoS, the voice quality is better, i.e.
fewer delays, less echoing, less crack-
ling.
R
RAM
Random Access Memory
Memory in which you have reading and
storage rights. Such items as melodies
and screen pictures are saved in the
RAM after being loaded onto the phone
via the Web configurator.
Registrar
The registrar manages the Network
subscribers current IP addresses.
When you register with your VoIP pro-
vider, your current IP address is saved
on the registrar. This means you can
also be reached when on the move.
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