183
Glossary
Gigaset N300/N300A IP / GBR / A31008-M2214-L101-2-7619 / Glossary.fm / 16.07.13
V
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rsion 4, 16.0
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Port number
Indicates a specific application of a
.
Depending on the setting in the
, the port number is permanently
assigned or it is assigned with each access.
The combination of
number
uniquely identifies the recipient or sender of
a data packet within a network.
Pre-dialling
See
.
Private IP address
See
Protocol
Describes the agreements for communicat-
ing within a
. 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
and
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
/
and
.
Public IP address
The public IP address is the address for a net-
work 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:
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.
R
RAM
Random Access Memory
Memory in which you have reading and stor-
age rights. Items such as melodies and logos
are saved in the RAM after you have loaded
them onto the phone via the Web configura-
tor.
Registrar
The registrar manages the current IP
addresses of the
. 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.
Ringback when the call is not answered
= CCNR (Completion of calls on no reply). If a
party does not reply when called, a caller can
arrange an automatic ringback. As soon as
the destination phone has completed a call
and is free again, the caller is called back.
This feature must be supported by the
exchange. The ringback request is automati-
cally cancelled after about two hours
(depending on the network provider).
Ringback when the number is busy
= CCBS (Completion of calls to busy sub-
scriber). If a caller hears the busy tone, he or
she can activate the ringback function. As
soon as the connection is free, the caller is
called back. As soon as the caller lifts the ear-
piece, the connection is made automatically.
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
and
WLAN. Can be a
to the Internet.
