Cisco ATA 190 Administration Manual page 70

Glossary
Internet Protocol. Network layer protocol in the TCP/IP stack offering a connectionless internetwork
IP
service. IP provides features for addressing, type-of-service specification, fragmentation and
reassembly, and security. Defined in RFC 791.
Interactive voice response. Term used to describe systems that provide information in the form of
IVR
recorded messages over phone lines in response to user input in the form of spoken words or, more
commonly, DTMF signaling.
L
Lightweight Directory Access Protocol
LDAP
local exchange carrier
LEC
A SIP redirect or proxy server uses a location server to get information about a caller's location.
Location Server
Location services are offered by location servers.
M
message waiting indication
MWI
µ North American companding standard used in conversion between analog and digital signals in PCM
-law
systems. Similar to the European a-law. See also a-law and companding.
N
Network Address Translation. Mechanism for reducing the need for globally unique IP addresses.
NAT
NAT allows an organization with addresses that are not globally unique to connect to the Internet by
translating those addresses into globally routable address spaces. Also known as Network Address
Translator.
Real-Time Transport Protocol (RTP) digit events are encoded using the Named Signaling Event (NSE)
NSE packets
format specified in RFC 2833, Section 3.0.
Network Address Translation. an Internet standard that enables a local-area network (LAN) to use one
NAT Server
set of IP addresses for internal traffic and a second set of addresses for external traffic.
Network Time Protocol. Protocol built on top of TCP that assures accurate local time-keeping with
NTP
reference to radio and atomic clocks located on the Internet. This protocol is capable of synchronizing
distributed clocks within milliseconds over long time periods.
P
Plain old phone service. Basic phone service supplying standard single-line phones, phone lines, and
POTS
access to the PSTN.
Cisco ATA 190 Analog Telephone Adaptor Administration Guide for SIP (Version 1.0)
GL-4
OL-31821-01