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Glossary
GL-4
Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
OL-4277-01
E
E.164
The international public telecommunications numbering plan. A standard set by
the ITU-T that addresses telephone numbers.
endpoint
A source or sink of voice data, which may be physical (such as a trunk interface
or a line interface in a media gateway) or logical (such as an announcement
stored on a server).
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.
FQDN
Fully qualified domain name. FQDN is the full name of a system, including the
domain name and not just the host name. For example, aldebaran is a host name,
and aldebaran.interop.com is an FQDN.
FSK
Frequency shift key.
FXO
Foreign exchange office. An FXO interface connects to the public switched
telephone network (PSTN) central office and is the interface offered on a
standard telephone. The Cisco FXO interface is an RJ-11 connector that allows
an analog connection at the PSTN central office or to a station interface on a
PBX.
FXS
Foreign exchange station. An FXS interface connects directly to a standard
telephone and supplies ring, voltage, and dial tone. The Cisco FXS interface is
an RJ-11 connector that allows connections to basic telephone service
equipment, keysets, and PBXs.