Glossary - Siemens Asterisk OpenStage 20 Owner's Manual

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Glossary

A
Address of Record (AoR)
A ->SIP ->URI that represents the "public address" of a SIP user resp. a phone or line. The
format is similar to an E-mail address: "username@hostname". (for a definition, see RFC
3261)
ADPCM
Adaptive Differential Pulse Code Modulation. A compressed encoding method for audio
signals which are to be transmitted by a low bandwidth. As opposed to regular ->PCM, a
sample is coded as the difference between its predicted value and its real value. As this
difference is usually smaller than the real, absolute value itself, a lesser number of bits can
be used to encode it.
C
CSTA
Computer Supported Telecommunications Applications. An abstraction layer for telecom-
munications applications allowing for the interaction of ->CTI computer applications with te-
lephony devices and networks.
CTI
Computer Telephony Integration. This term denotes the interaction of computer applica-
tions with telephony devices and networks.
D
DFT
Digital Feature Telephone. A phone with no line keys.
DHCP
Dynamic Host Configuration Protocol. Allows for the automatic configuration of network
endpoints, like IP Phones and IP Clients.
DiffServ
Differentiated Services. Specifies a layer 3 mechanism for classifying and managing net-
work traffic and providing quality of service (->QoS) guarantees on ->IP networks. DiffServ
can be used to provide low-latency, guaranteed service for e. g. voice or video communi-
cation.
A31003-S2000-M102-1-76A9, 06/02/2009
Asterisk - OpenStage Family, Administration Manual
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Glossary
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