Technical Terms
189
GSM
Global System for Mobile Communication
Global system for mobile communication
H.323
A collection of international specifications (ITU),
which define the transmission of multimedia data to
packet-oriented data connections.
H.323 Alias
Name
A symbolic name (e.g. TOMMY), which can be used
as the address of an H.323 terminal instead of an IP
address.
H.450
Standard for additional performance specifications
in H.323, such as Conference, Call Forwarding, Hold,
Call Swap, etc.
HTTP
Hypertext Transfer Protocol. A protocol for trans-
mission of data over a network. It is mainly used for
loading websites and other data from the World
Wide Web (WWW) into a Web browser.
Hub
A hub creates a network node in a star-shaped LAN
and it connects several clients to the network.
ID
Identification
IEEE
Institute of Electrical and Electronics Engineers
International standardization committee
Instant
Messaging
(Immediate message transfer). A service that uses
the Instant Messenger software (client) to enable
real-time communication (chat) with other subscrib-
ers. Short text messages are sent using push
technology via a network (server) to the recipient
(usually via the Internet), who can respond to them
immediately. Files can usually also be exchanged by
this means. In addition, many messaging programs
offer video or telephone conferences.
IPEI
Hardware address (12 digits) of a DECT handset
which allows an unique identification.
Term
Explanation
IP
Internet Protocol
Fundamental protocol of the Internet, which
combines packet-oriented networks with different
technical bases to one large network.
Thus this protocol (on layer 3 of the OSI layer
model) is used for addressing and distributing data
into packets.
IP-adress
An IP address is a 32-bit number, which is usually
shown as a four-part number, e.g. 192.177.65.4, and
which is assigned to every computer connected to
the Internet. Domain names, which are unambigu-
ously assigned to IP addresses using a DNS server,
were introduced in order to make these addresses
simpler and clearer for users.
IP PBX
IP Private Branch Exchange
A telephone private branch exchange (PBX) which is
created by a software application. It uses Voice-over-
IP (VoIP) technology for voice transmission.
ISDN
Integrated Services Digital Network
Service integrating digital network
ITSP
Internet Telephony Service Provider.
An Internet telephony service provider offers an
interface via a gateway between Internet telephony
and the classic telephone network. Thus via an ITSP,
VoIP users can also reach subscribers in the classic
telephone network, and vice versa.
IVR
Interactive Voice Response
Interactive Call handling
LAN
Local Area Network
A local network, which is made up of numerous,
interconnected computer terminals within one
company location and which is used to transfer data.
Term
Explanation