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Glossary
Gigaset C470-475 IP / EN for IM-Ost / A31008-xxxx-xxxx-x-xxxx / glossary.fm / 16.8.07
Version 2.1, 08.01.2007
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 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 data packet optimisation.
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 regis-
ter 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 participant does not respond when called,
a caller can arrange an automatic ringback. As soon as the destination phone has com-
pleted a call and is free again, the caller is rung back. This feature must be supported by
the exchange. The ringback request is automatically cancelled after about 2 hours
(depending on the VoIP provider).
Ringback when the number is busy
= CCBS (Completion of Calls to Busy Subscriber). 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
rung back. As soon as the caller lifts his receiver the connection is made automatically.
VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
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