Glossary and Abbreviations
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
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
ISDN trunk
A trunk administered for use with
ISDN-PRI terminal adapter
An interface between endpoint applications and 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