Siemens HIPATH 20 - Manual (Page 249)

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HiPath 8000 - OpenStage Family, Administration Manual
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Nur für den internen Gebrauch 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 OpenStage phone allows for the
setting of QoS parameters on layer 2 and layer 3 (DiffServ).
QDC
QoS Data Collection. A HiPath IP service that is used to collect data from HiPath products
in order to analyze their voice and network quality.
QCU
Quality of Service Data Collection Unit. A service tool that collects QoS report data from
IP endpoints.
QoS
Quality of Service. Provides different priority to different users or data flows, or guarantee
a certain level of performance to a data flow.
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
and video communication. Typically, the underlying protocol is ->UDP.
S
SDP
Session Description Protocol. Describes and initiates multimedia sessions, like web con-
ferences. The informations provided by SDP can be processed by ->SIP.
SIP
Session Initiation Protocol. Signaling protocol for initialising and controlling sessions, used
e. g. for ->VoIP calls.