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Glossary
Gigaset DE900 IP PRO / en / A31008-M2210-R101-3x-7619 / glossary.fm / 22.03.2011
Version 2, 27.05.2010
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.
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 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 pack-
ets, 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 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
screen pictures are saved in the RAM after you have loaded them onto the phone via
the Web configurator.
Registrar
The registrar manages the network subscribers' current IP addresses. When you reg-
ister with your VoIP provider, your current IP address is saved on the registrar. This
means you can also be reached when on the move.
ROM
Read Only Memory
A type of memory that can only be read.
Router
Routes data packets within a network and between different networks via the quickest
route. Can connect Ethernet networks and WLAN. Can be the gateway to the Internet.
Routing
Routing is the transfer of data packets to another subscriber in your network. On their
way to the recipient, the data packets are sent from one router to the next until they
reach their destination.
If data packets were not forwarded in this way, a network like the Internet would not
be possible. Routing connects the individual networks to this global system.
A router is a part of this system; it transfers data packets both within a local network
and from one network to the next. Transfer of data from one network to another is per-
formed on the basis of a common protocol.
