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CHAPTER 11. GLOSSARY
Call Appearance, Voice Terminal
On all multi-appearance voice terminals except the 7401 D, button labeled with an
extension number used to place outgoing calls, receive incoming calls, or hold calls.
Two lamps next to the button show the status of the call appearance or status of the
call. (The 7401 D has two call appearances but does not have call appearance
buttons with status lamps.)
Callback Call
A call that is automatically returned to a voice terminal user who activated the
Automatic Callback or Ringback Queuing feature.
Call Waiting Ringback Tone
A low-pitched tone identical to the ringback tone except the tone decreases the last
0.2 second. This tone notifies the attendant that the Attendant Call Waiting feature
has been activated and that the called user is aware of the waiting call.
Central Office
The location housing telephone switching equipment that provides local telephone
service and access to toll facilities for long-distance calling.
Central Office Codes
The first three digits of a 7-digit public network telephone number. These codes are
numbered from 200 through 999.
Central Office Trunk
A telecommunications channel that provides access from the system to the public
network through the local central office.
Class of Restriction (COR)
A number (O through 63) that specifies the restrictions assigned to voice terminals,
voice terminal groups, data modules, and trunk groups.
Confirmation Tone
Three short bursts of tone followed by silence; indicates that the feature activated,
deactivated, or canceled has been accepted.
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