Glossary of Terms
Allowed List
Many PABX systems can restrict toll calls. They allow you to call certain numbers while disallowing calling
others. These numbers are in the Allowed list or the disallowed list.
Automatic
Attendant
The Automatic Attendant is like an operator. It is the part of the PABX that answers incoming calls by
playing your recorded messages. The messages greet the callers and instruct them to dial the needed
extension number. Once the caller selects an extension, the Automatic Attendant automatically routes the
call to that extension.
CO Line
Central Office. This is the switching equipment that provides local-exchange telephone service, that is,
the telephone company. All of the telephone lines coming to your company are coming from the Central
Office. A CO line is the same as an external line.
External Line
An external line is the same as a CO line.
Extension numbers
Extension numbers are the numbers assigned to each port for identification purposes during dialing.
Hunt Group
Hunt group is a group of extensions that serve the same function. For example, if you call the Customer
Service hunt group, the first non-busy extension in that group will ring.
PABX
Private Automatic Branch Exchange. This is a switching system that makes the connections between
your extension and other extensions or external CO lines.
PBX
Private Branch Exchange. See PABX.
TeleCraft Telephone Systems
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