Gigaset A510 IP, Manual

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164
Glossary
Gigaset A510IP / USA en / A31008-M2230-R301-2-6019 / Glossary.fm / 09.10.2012
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Port forwarding
The Internet gateway (e.g., your router) forwards data packets from the Internet that are
directed to a certain Port to the port concerned. 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 communicating within a Network . It contains rules for opening,
administering and closing a connection, 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 names
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 (gate-
way, 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, reserv-
ing 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 logos are
saved in the RAM after you have loaded them onto the phone via the Web configurator.