Cisco Systems ATA187I1ARF manual GL-2

Glossary

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
	VoIP.
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 phone, 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 phone 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

	Cisco ATA 187 Analog Telephone Adaptor Administration Guide for SIP (Version 1.0)
GL-2	OL-21862-01