Cisco Systems 7905G, 7912G manual GL-4

Glossary

E

E.164

endpoint

The international public telecommunications numbering plan. A standard set by the ITU-T that addresses telephone numbers.

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

FXO

Frequency shift key.

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.

	Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
GL-4	OL-4277-01