Siemens Gigaset A580 IP Manual page 191

Glossary
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
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
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
performed on the basis of a common protocol.
RTP
Realtime Transport Protocol
Global standard for transferring audio and video data. Often used in conjunction
with UDP. In this case, RTP packets are embedded in UDP packets.
RTP port (Local) Port
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 completed a call and is free again, the caller is rung back. This feature
must be supported by the exchange. The ringback request is automatically can-
celled after about 2 hours (depending on the VoIP provider).
190
Network
Ethernet networks
that is used to send and receive voice data packets for VoIP.
subscribers' current IP addresses. When you
and WLAN. Can be a Gateway to