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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Glossary and abbreviations
1638
INS
ISDN Network Service
inside call
A call placed from one telephone to another within the local communications system.
Integrated Services Digital Network (ISDN)
A public or private network that provides end-to-end digital communications for all services to which users
have access by a limited set of standard multipurpose user-network interfaces defined by the CCITT. Through
internationally accepted standard interfaces, ISDN provides digital circuit-switched or packet-switched com-
munications within the network and links to other ISDNs to provide national and international digital commu-
nications. See also Integrated Services Digital Network Basic Rate Interface (ISDN-BRI)
and Integrated
Services Digital Network Primary Rate Interface (ISDN-PRI).
Integrated Services Digital Network Basic Rate Interface (ISDN-BRI)
The interface between a communications system and terminal that includes two 64-kbps B-channels for trans-
mitting voice or data and one 16-kbps D-channel for transmitting associated B-channel call control and
out-of-band signaling information. ISDN-BRI also includes 48 kbps for transmitting framing and D-channel
contention information, for a total interface speed of 192 kbps. ISDN-BRI serves ISDN terminals and digital
terminals fitted with ISDN terminal adapters. See also Integrated Services Digital Network (ISDN)
andInte-
grated Services Digital Network Primary Rate Interface (ISDN-PRI).
Integrated Services Digital Network Primary Rate Interface (ISDN-PRI)
The interface between multiple communications systems that in North America includes 24 64-kbps chan-
nels, 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 informa-
tion. With nonfacility-associated signaling (NFAS), ISDN-PRI can include 24 B-channels and no D-channel.
See alsoIntegrated Services Digital Network (ISDN)
andIntegrated Services Digital Network Basic Rate
Interface (ISDN-BRI).
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 inter-
national 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 (ITU)
.
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.