234
Glossary
S675IP / USA-CAN eng / A31008-xxxx-xxxx-x-xxxx / glossary.fm / 14.05.2009
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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
current IP addresses. When
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.
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 automat-
ically canceled 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 the receiver the connection is
made automatically.
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
to the Internet.
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