159
Glossary
Gigaset DX800A all in one / USA EN / A31008-xxxxx-xxxx-x-xxxx / Glossary.fm / 06.09.11
Version 4, 16.09.2005
P
Paging (handset search)
Base function for locating the registered
handsets. The base establishes a connection
to every registered handset. The handsets
start to ring.
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.
You can protect your base configuration
data with a system PIN (4-digit number com-
bination).
Port
Data is exchanged between two applica-
tions in a Network via a port.
Port forwarding
The Internet gateway (e.g., your router) for-
wards data packets from the Internet that
are directed to a certain Port to the port con-
cerned. 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 it is 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 communicat-
ing within a Network. It contains rules for
opening, administering and closing a con-
nection, 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 net-
work 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 communi-
cation 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 optimising data
packets.
In VoIP networks, QoS influences the voice
quality. If the whole infrastructure (router,
network server etc.) has QoS, the voice qual-
ity is better, i.e., fewer delays, less echoing,
less crackling.
