Specifications

Appendix C - Glossary Administration Manual (SIP/MGCP Version)
AT-VP504E FXS 135
Proxy Server An intermediary program that acts as both a server and a client for the
purpose of making requests on behalf of other clients. Requests are
serviced internally or by passing them on, possibly after translation, to
other servers. A proxy interprets, and, if necessary, rewrites a request
message before forwarding it.
Public Switched
Telephone Network
(PSTN)
The local telephone company network that carries voice data over
analog telephone lines.
Quality of Service
(QoS)
Quality of Service is a measure of the telephone service quality
provided to a subscriber. This could be, for example, the longest time
someone should wait after picking up the handset before they receive
dial tone (three seconds in most U.S. states).
Realtime Transport
Protocol (RTP)
An IETF standard for streaming realtime multimedia over IP in packets.
Supports transport of real-time data like interactive voice and video
over packet switched networks.
Registrar Server A server that accepts REGISTER requests. A registrar is typically co-
located with a proxy or redirect server and MAY offer location services.
Router A specialized switching device which allows customers to link different
geographically dispersed local area networks and computer systems.
This is achieved even though it encompasses different types of traffic
under different protocols, creating a single, more efficient, enterprise-
wide network.
Switched Circuit
Network (SCN)
A communication network, such as the public switched telephone
network (PSTN), in which any user may be connected to any other user
through the use of message, circuit, or packet switching and control
devices.
Server A computer or device on a network that works in conjunction with a
client to perform some operation, for example a Windows NT Server.
Session Initiation
Protocol (SIP)
SIP is a simple signalling protocol for Internet conferencing and
telephony.
Simple Network
Management Protocol
(SNMP)
A standard of network management that uses a common software
agent to manage local and wide area network equipment from different
vendors; part of the Transmission Control Protocol / Internet Protocol
(TCP/IP) suite and defined in RFC 1157.