Operation Manual

AT-RG213 Residential VoIP Gateway - SIP Software Reference Manual
SIP Software Release 6-0-0
J613-M0524-00
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usually the name of the program that the user invokes to execute the
protocol.
See anonymous FTP.
G
G.711 ITU-T recommendation for an algorithm designed to transmit and
receive A-law PCM (Pulse Code Modulation) voice at digital bit rates of 48,
56, and 64 kbps. It is used for digital telephone sets on digital PBX and ISDN
channels.
G.723.1 A Codec that provides the greatest compression, 5.3 kbps or 6.3
kbps; typically specified for multimedia applications such as H.323
videoconferencing.
G.729/G.729A A Codec that provides near toll quality at a low delay which
uses compression to 8 Kbps (8:1 compression rate).
gateway A device linking two different types of networks that use different
protocols (for example, between the packet network and the Public Switched
Telephone Network).
gatekeeper A gatekeeper identifies, controls, counts, and supervises the
traffic or flow through the network. It also provides functions such as
terminal and gateway registration, address resolution, band-width control,
and admission control.
H
H323 An umbrella standard for audio/video conferencing over unreliable
networks; architecture and procedures are covered by this standard; H.323
relies on H.225 and H.245.
header The portion of a packet, preceding the actual data, containing source
and destination addresses, and error checking and other fields. A header is
also the part of an electronic mail message that precedes the body of a
message and contains, among other things, the message originator, date and
time. See packet.
hello packet Hello packets are used in a number of network protocols, to
perform similar functions. Typically, a Hello packet is used to advertise a
node’s presence to the network or to establish and maintain information
about the presence of other nodes (including hosts and routers) in the
network.
heterogeneous network A network running multiple network layer
protocols, e.g. DECnet, IP, IPX.
host An (end-user) computer system that connects to a network, such as a
PC, minicomputer of mainframe.