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A31003-C1000-M101-1-76A9, 03/2016
OpenScape Desk Phone CP200/400/600, Administrator Documentation
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Glossary
Q
QoS
Quality of Service. The term refers to control mechanisms that can provide different priority
to different users or data flows, or guarantee a certain level of performance to a data flow
in accordance with requests from the application program. The OpenScape Desk Phone
CP phone allows for the setting of QoS parameters on layer 2 and layer 3 (DiffServ).
R
RAM
Random Access Memory. Memory with read / write access.
ROM
Read Only Memory. Memory with read only access.
RTCP
Realtime Transport Control Protocol. Controls the -> RTP stream and provides information
about the status of the transmission, like QoS parameters.
RTP
Realtime Transport Protocol. This application layer protocol has been designed for audio
communication.
S
SDP
Session Description Protocol. Describes and initiates multimedia sessions, like web con-
ferences. The informations provided by SDP can be processed by -> SNMP.
SNMP
Simple Network Management Protocol. Used for monitoring, controlling, and administra-
tion of network and network devices.
SNTP
Simple Network Time Protocol. Used to synchronize the time of a terminal device with a
timeserver.
Subnet Mask
To discern the network part from the host part of an -> IP address, a device performs an
AND operation on the IP address and the network mask. The network classes A, B, and C
each have a subnet mask that demasks the relevant bits: 255.0.0.0 for Class A,
255.255.0.0 for Class B and 255.255.255.0 for Class C. In a Class C network, for instance,
254 IP addresses are available.
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