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Glossary
GL-2
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)
OL-4803-01
compression
The running of a data set through an algorithm that reduces the space required to store or the bandwidth
required to transmit the data set. Compare with companding and expansion.
CoS
Class of service. An indication of how an upper-layer protocol requires a lower-layer protocol to treat
its messages. In SNA subarea routing, CoS definitions are used by subarea nodes to determine the
optimal route to establish a given session. A CoS definition comprises a virtual route number and a
transmission priority field.
D
DHCP
Dynamic Host Configuration Protocol. Provides a mechanism for allocating IP addresses dynamically
so that addresses can be reused when hosts no longer need them.
dial peer
An addressable call endpoint. In Voice over IP (VoIP), there are two types of dial peers: POTS and
Vo I P.
DNS
Domain Name System. System used on the Internet for translating names of network nodes into
addresses.
DSP
digital signal processor. A DSP segments the voice signal into frames and stores them in voice
packets.
DTMF
dual tone multifrequency. Tones generated when a button is pressed on a telephone, primarily used in
the U.S. and Canada.
E
E.164
The international public telecommunications numbering plan. A standard set by the ITU-T which
addresses telephone numbers.
endpoint
A SIP terminal or gateway. An endpoint can call and be called. It generates and/or terminates the
information stream.
expansion
The process of running a compressed data set through an algorithm that restores the data set to its
original size. Compare with companding and compression.
F
firewall
Router or access server, or several routers or access servers, designated as a buffer between any
connected public networks and a private network. A firewall router uses access lists and other methods
to ensure the security of the private network.
FoIP
Fax over IP
FQDN
Fully Qualified Domain (FQDN) format “mydomain.com” or “company.mydomain.com.”
FSK
Frequency shift key.