Lucent Technologies 7101A User Manual
DEFINITY® Enterprise Communications Server Release 7
Console Operations
Console Operations
555-230-700
Issue 4
June 1999
Glossary and Abbreviations
76
I
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 communications within the network and links to other ISDNs to
provide national and international digital communications. See also
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 communications within the network and links to other ISDNs to
provide national and international digital communications. See also
.
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 also
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 also
.
intercept tone
A tone that indicates a dialing error or denial of the service requested.
internal call
A connection between two users within a system.
ISDN trunk
A trunk administered for use with ISDN-PRI. Also called ISDN facility.
L
line
A transmission path between a communications system or CO switching system and a phone or
other terminal.
other terminal.
line appearance
.
LWC
Leave Word Calling
M
multiappearance phone
A terminal equipped with several call-appearance buttons for the same extension, allowing the
user to handle more than one call on that same extension at the same time.
user to handle more than one call on that same extension at the same time.