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P
Plain old telephone service. Basic telephone service supplying standard single-line telephones,
POTS
telephone lines, and access to the PSTN.
An intermediary program that acts as both a server and a client for the purpose of making requests on
Proxy Server
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
Q
Quality of Service. The capability of a network to provide better service to selected network traffic
QoS
over various technologies, including Frame Relay, Asynchronous Transfer Mode (ATM), Ethernet
and 802.1 networks, SONET, and IP-routed networks that may use any or all of these underlying
technologies. The primary goal of QoS is to provide priority including dedicated bandwidth,
controlled jitter and latency (required by some real-time and interactive traffic), and improved loss
characteristics.
R
A redirect server is a server that accepts a SIP request, maps the address into zero or more new
Redirect Server
addresses, and returns these addresses to the client. It does not initiate its own SIP request nor accept
calls.
A registrar server is a server that accepts Register requests. A registrar is typically co-located with a
Registrar Server
proxy or redirect server and may offer location services.
Network layer device that uses one or more metrics to determine the optimal path along which
router
network traffic should be forwarded. Routers forward packets from one network to another based on
network layer information. Occasionally called a gateway (although this definition of gateway is
becoming increasingly outdated). Compare with gateway.
Real-Time Transport Protocol. One of the IPv6 protocols. RTP is designed to provide end-to-end
RTP
network transport functions for applications transmitting real-time data, such as audio, video, or
simulation data, over multicast or unicast network services. RTP provides services such as payload
type identification, sequence numbering, timestamping, and delivery monitoring to real-time
applications.
S
Signaling connection control part.
SCCP
Session Definition Protocol. An IETF protocol for the definition of Multimedia Services. SDP
SDP
messages can be part of SGCP and MGCP messages.
OL-4804-01
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0)
Glossary
GL-5
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