Siemens Gigaset A580 User Manual page 182

Q
Quality of Service (QoS)
Quality of service
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 prioritizing data
packets, reserving bandwidth and data packet optimization.
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 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 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 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 the receiver the connection is
made automatically.
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
Glossary
Gateway
181