Siemens Gigaset A580 IP User Manual page 193

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
you register with your VoIP provider, your current IP address is saved on the reg-
istrar. This means you can also be reached when on the move.
ROM
Read Only Memory
A type of memory that can only be read.
Routes data packets within a network and between different networks via the
Router
quickest route. Can connect
to the Internet.
Routing is the transfer of data packets to another subscriber in your network.
Routing
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 net-
work 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 conjunc-
tion 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 desti-
nation 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 auto-
matically cancelled after about 2 hours (depending on the VoIP provider).
192
Network
Ethernet networks
that is used to send and receive voice data packets for VoIP.
subscribers' current IP addresses. When
and WLAN. Can be a Gateway