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Glossary and Abbreviations
555-230-024GL-26 Issue 5 January 1998
ICD
Inbound Call Director
ICDOS
International Customer-Dialed Operator Service
ICHT
Incoming call-handling table
ICI
Incoming call identifier
ICM
Inbound Call Management
IDDD
International Direct Distance Dialing
IDF
Intermediate distribution frame
IE
Information element
immediate-start tie trunk
A trunk on which, after making a connection with a distant switching system for an outgoing call,
the system waits a nominal 65 ms before sending the digits of the called number. This allows time
for the distant system to prepare to receive digits. On an incoming call, the system has less than
65 ms to prepare to receive the digits.
IMT
Intermachine trunk
in
Inch
INADS
Initialization and Administration System
incoming gateway
A PBX that routes an incoming call on a trunk
not
administered for Supplementary Services
Protocol B to a trunk
not
administered for
Supplementary Services Protocol B.
information exchange
The exchange of data between users of two different systems, such as the switch and a host
computer, over a LAN.
Information Systems Network (ISN)
A WAN and LAN with an open architecture combining host computers, minicomputers, word
processors, storage devices, PCs, high-speed printers, and nonintelligent terminals into a single
packet-switching system.
INS
ISDN Network Service
inside call
A call placed from one telephone to another within the local communications system.