AddPac VoiceFinder AP2120 Manual do Utilizador descarregar pdf (Página 150)

2004 AddPac Solution Guide May 2004

AddPac Technology Proprietary & Documentation 157 - 150

management. H.323 entity on a LAN that provides address translation

and control access to the LAN for H.323 terminals and gateways. The

gatekeeper can provide other services to the H.323 terminals and

gateways, such as bandwidth management and locating gateways. A

gatekeeper maintains a registry of devices in the multimedia network.

The devices register with the gatekeeper at startup and request

admission to a call from the gatekeeper.

H.225

An International Telecommunication Union (ITU-T) standard for H.225.0

session control and packetization. It defines various protocols of RAS,

Q.931, RTP and etc.

H.245

An International Telecommunication Union (ITU-T) standard for H.245

end-point control.

H.323

An International Telecommunication Union (ITU-T) standard that

describes packet-based video, audio, and data conferencing.

HBD3

Line code type of E1 line.

HDLC

An acronym for High-Level Data Link Control. A transmission protocol for

the Data Link Layer. In HDLC, data is organized into a unit (called a

frame) and sent across a network to a destination that verifies its

successful arrival. Variations of HDLC are also used for the public

networks that use the X.25 communications protocol and for frame

relay, a protocol used in both and wide area network, public and

private.

Hookflash

Short on-hook period usually generated by a telephone-like device

during a call to indicate that the telephone is attempting to perform a

dial-tone recall from a PBX. Hookflash is often used to perform call

transfer.

HTTP

An acronym for Hypertext Transfer Protocol. A file transfer protocol used

by web browser or web server for transmitting text or graphic files.

IPSec

Internet Protocol Security protocol, a framework for a set of protocols

for security at the network or packet processing layer of network

communication. Earlier security approaches have inserted security at

the Application layer of the communications model. IPsec is said to be

especially useful for implementing virtual private networks and for

remote user access through dial-up connection to private networks. A

big advantage of IPsec is that security arrangements can be handled

without requiring changes to individual user computers. Cisco has been

a leader in proposing IPsec as a standard (or combination of standards

and technologies) and has included support for it in its network routers.

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