Nortel SRG200 Configuration Manual page 98

98 Glossary
The system that provides telephony services to redirected SRG IP telephones in
main office, main
normal mode.
office call server
Network Connection Server
NCS
The NCS is an H.323 gatekeeper. It provides standard H.323 gatekeeper functionality,
as well as support for branch office and virtual office features.
The operating mode of the SRG when connectivity with the main office is
normal mode
established.
Quality of Service
QoS
In IP telephony, QoS refers to the quality of the voice communication channel. There
are inherent difficulties associated with transmitting voice over IP and quality of
service is a significant challenge for service providers. QoS specifications allow
service providers and their customers to establish and monitor acceptable levels of
service.
Steering codes are similar to line pool access codes and destination codes. Steering
steering codes
codes determine where a call gets routed.
(Internet Telephone) Terminal Proxy Server
TPS
A TPS controls the connection between IP telephones.
Uniform Dialing Plan
UDP
Each location within the network is assigned a Location Code. On a private network,
this code precedes the directory number of the telephone being dialed. Depending on
routing configuration, this number may be part of the destination code, or it may
automatically be dialed out when the appropriate destination code is dialed before the
directory number. Under the Uniform Dialing Plan (UDP), the SRG must include this
code in the BUID.
User Datagram Protocol
UDP
A member of the TCP/IP protocol suite that transports data as a connectionless
protocol, using packet switching. Generally, ports on the SRG support UDP.
Voice over IP trunk
VoIP trunk
A pathway between two systems that allows voice to be transmitted over an IP
connection.
Wide Area Network
WAN
A computer network that spans a relatively large geographical area. The largest WAN
in existence is the Internet.
Zone Digit Prefix
ZDP
The main office appends this number to an SRG local-PSTN call dialed from an SRG
IP telephone. The number differentiates the call from a main office local-PSTN call
dialed by a main office telephone.
N0075588 N0075588