Avaya Communication Manager Administrator's Manual page 1805

Integrated Services Digital Network Primary Rate Interface (ISDN-PRI)
The interface between multiple communications systems that in North America includes 24 64-kbps
channels, corresponding to the North American digital signal level-1 (DS1) standard rate of 1.544
Mbps. The most common arrangement of channels in ISDN-PRI is 23 64-kbps B-channels for
transmitting voice and data and 1 64-kbps D-channel for transmitting associated B-channel call
control and out-of-band signaling information. With nonfacility-associated signaling (NFAS),
ISDN-PRI can include 24 B-channels and no D-channel. See
(ISDN) andIntegrated Services Digital Network Basic Rate Interface
intercept tone
A tone that indicates a dialing error or denial of the service requested.
interface
A common boundary between two systems or pieces of equipment.
internal call
A connection between two users within a system.
International Telecommunications Union (ITU)
Formerly known as International Telegraph and Telephone Consultative Committee (CCITT), ITU is
an international organization that sets universal standards for data communications, including ISDN.
ITU members are from telecommunications companies and organizations around the world. See
alsoBX.25.
International Telegraph and Telephone Consultative Committee
See International Telecommunications Union
interflow
The ability for calls to forward to other splits on the same PBX or a different PBX using the Call
Forward All Calls feature.
intraflow
The ability for calls to redirect to other splits on the same PBX on a conditional or unconditional basis
using call coverage busy, don't answer, or all criteria.
internal measurements
BCMS measurements that are made by the system. ACD measurements that are made external to the
system (via External CMS) are referred to as external measurements.
in-use lamp
A red light on a multiappearance voice terminal that lights to show which call appearance will be
selected when the handset is lifted or which call appearance is active when a user is off-hook.
INWATS
Inward Wide Area Telephone Service
IO
Information outlet
IP
Internet Protocol
ISDN
See Integrated Services Digital Network
ISDN-BRI
Integrated Services Digital Network-Basic Rate Interface
Administrator's Guide for Avaya Communication Manager
November 2003
alsoIntegrated Services Digital Network
(ITU).
(ISDN).
Glossary and Abbreviations
(ISDN-BRI).
1805
I