Operation Manual

AT-RG213 Residential VoIP Gateway - SIP Software Reference Manual
SIP Software Release 6-0-0
J613-M0524-00
114
operation of the system or the activities of other users. The router has two
levels of privilege, MANAGER and USER. Users with USER privilege (most
users) have access to a limited subset of the commands available to
MANAGER level users.
prompt A text string displayed on a terminal by a computer to indicate that
it is ready to receive the next command from the user.
protocol A formal description of message formats and the rules two
computers must follow to exchange those messages. Protocols can describe
low-level details of machine-to-machine interfaces (e.g., the order in which
bits and bytes are sent across a wire) or high-level exchanges between
allocation programs (e.g., the way in which two programs transfer a file
across the Internet).
proxy A software agent that acts on behalf of a user. Typical proxies accept a
connection from a user, make a decision as to whether or not the user is
permitted to use the proxy, performs any additional authentication, and
then completes a connection on behalf of the user to a remote destination.
PSN Packet Switch Node. A dedicated computer whose purpose is to accept,
route and forward packets in a packet switched network. See packet
switching.
PSTN Public-Switched Telephone Network. A communication common carrier
network that provides voice and data communication services over switched
lines.
Q
QCIF Quarter common intermediate format
R
RAS Reliability, availability, and serviceability. Rated throughput for data
links, the rate at which all of the offered frames are forwarded by the device.
RFC Request for comments. The document series, begun in 1969, which
describes the Internet suite of protocols and related experiments. Not all
RFCs describe Internet standards, but all Internet standards are written up
as RFCs.
router A system responsible for making decisions about which of several
paths network (or Internet) traffic will follow. To do this it uses a routing
protocol to gain information about the network, and algorithms to choose
the best route based on several criteria known as “routing metrics.” See
gateway.