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Glossary
Port forwarding
The Internet gateway (e.g., your router) forwards data packets from the
directed to a certain
on the Internet without you needing a public IP address.
Port number
Indicates a specific application of a
the port number is permanently assigned or it is assigned with each access.
The combination of
IP address/Port
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
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
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 (gate-
way, 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, reserv-
ing bandwidth and optimising data packets.
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.
R
RAM
Random Access Memory
Memory in which you have reading and storage rights. Items such as melodies and logos are
saved in the RAM after you have loaded them onto the phone via the Web configurator.
168
Port
to the port concerned. This allows servers in the
Network
number uniquely identifies the recipient or sender of a data
subscriber. Depending on the setting in the LAN,
Client
Internet
that are
LAN
to offer services
and
Server
in computer
IP address/Domain names
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