GENERAL BELL If the operator is absent, internal and external calls to the operator are directed to
an external signaling device that lets any authorized terminal take these calls.
8.8 H
H.323 ITU standard for multimedia communication (voice, video, data).
H.450 Additional services associated with H.323 version 2.
HSL High Speed Link. Link between the basic module and a module expansion; requires an HSL
daughter board to be fitted on the PowerCPU EE and PowerMEX boards.
HTTP HyperText Transfer Protocol. Standard application protocol for exchanging files (text, images,
audio, video, etc.) over the Internet.
HTTPS Secure HyperText Transfer Protocol. Secure version of HTTP: encrypts and decrypts pages
containing user requests as well as pages retrieved from a web server.
8.9 I
IAP Internet Access Provider. See ISP.
IBS Intelligent Base Station. There are 2 kinds of IBSs: one that can be installed indoors, one
outdoors.
ICMP Internet Control Message Protocol. Network protocol that provides error reports and
information on the processing of IP packets.
IM Instant Messaging
IMAP4 Internet Message Access Protocol. A protocol of the same type as POP3, the difference
being that the messages always stay on the ISP server, even after consultation. IMAP
requires continuous access to the server while the messaging service is in use.
IN Installation Number
IP Internet Protocol. The main protocol supporting the Internet. IP governs the forwarding
and transmission of data packets over supporting multivendor packet-switched networks.
IP-DECT Wireless communication which uses VoIP between the server and the base station and
the DECT air interface between the base station and the mobile handsets.
IPSec Internet Protocol Security. Standard taking network security into account. Protocol used in
the implementation of VPNs, and for remote access by connection to a VPN.
ISDN Integrated Services Digital Network. Standard for the transmission of digital data over
telephone cables or other communication vectors.
ISDN-EFM Integrated Services Digital Network- Emergency Forwarding Module. T0/S0 Forwarding
Module.
ISP Internet Service Provider. Internet Access Provider. A company that provides Internet
access for individuals and companies, along with other services, such as web site
construction and hosting.
ISVPN Integrated Services Virtual Private Network. Protocol used in a private virtual digital
network; it offers functions such as transfer optimization and the transmission of
information such as the name, busy status or diversions.
ISVPN+ Includes metering information in addition to the usual ISVPN services.
Chapter
8
Glossary
3EH21123USAA - Ed. 01 - April 2017 - Installation Manual 202/207
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