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Glossary and Abbreviations
555-230-024GL-28 Issue 5 January 1998
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
ISDN
See Integrated Services Digital Network (ISDN).
ISDN Gateway (IG)
A feature allowing integration of the switch and a host-based telemarketing application via a link
to a gateway adjunct. The gateway adjunct is a 3B-based product that notifies the host-based
telemarketing application of call events.
ISDN trunk
A trunk administered for use with ISDN-PRI. Also called ISDN facility.
ISDN-PRI terminal adapter
An interface between endpoint applications and an ISDN PRI facility. ISDN-PRI terminal adapters
are currently available from other vendors and are primarily designed for video conferencing
applications. Accordingly, currently available terminal adapters adapt the two pairs of video
codec data (V.35) and dialing (RS-366) ports to an ISDN PRI facility.
IS/DTT
Integrated Services/digital tie trunk
ISN
Information Systems Network
ISO
International Standards Organization
ISV
Independent software vendor
ITP
Installation test procedure
ITU
International Telecommunications Union
IXC
Interexchange carrier code
K
kHz
Kilohertz
kbps
Kilobits per second