Gigaset DL500a, Manual

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123
Glossary
Gigaset DL500A / GRC EN / A31008-N3103-T101-2-7619 / Glossary.fm / 20.01.11
V
e
rsion 4, 16.0
9
.2005
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.
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
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.
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
receiver, the connection is made automati-
cally.
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 network s and
WLAN. Can be a 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.