elmeg IP120 / en / elmegIP120_v1 / glossary.fm / 01.08.2012
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Glossary
Proxy/Proxy server
Computer program that controls the exchange of data between
client
and
server
in compu-
ter 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 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 optimising data packets.
In VoIP networks, QoS influences the voice quality. If the whole infrastructure (router, net-
work 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. Items such as melodies and screen
pictures are saved in the RAM after you have loaded them onto the phone via the Web con-
figurator.
Registrar
The registrar manages the
network subscribers'
current IP addresses. When you register
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 pos-
sible. 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 performed on the
basis of a common protocol.
