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SPA9000 Voice System Administration Guide 278
Glossary
ACD (Automatic Call Distribution)—A switching system designed to allocate
incoming calls to certain positions or agents in the order received and to hold calls
not ready to be handled (often with a recorded announcement).
Area code—A 3-digit code used in North America to identify a specific
geographic telephone location. The first digit can be any number between 2 and 9.
The second and third digits can be any number.
Billing increment—The division by which the call is rounded. In the field it is
common to see full-minute billing on the local invoice while 6-second rounding is
the choice of most long-distance providers that bill their customers directly.
Blocked calls—Caused by an insufficient network facility that does not have
enough lines to allow calls to reach a given destination. May also pertain to a call
from an originating number that is blocked by the receiving telephone number.
Bundled service—Offering various services as a complete package.
Call completion—The point at which a dialed number is answered.
Call termination—The point at which a call is disconnected.
CDR (Call Detail Records)—A software program attached to a VoIP/telephone
system that records information about the telephone number’s activity.
Carrier’s carrier—Companies that build fiber optic and microwave networks
primarily selling to resellers and carriers. Their main focus is on the wholesale and
not the retail market.
Casual access—When customers choose not to use their primary carriers to
process the long-distance call being made. The customer dials the carrier’s
101XXXX number.
CO (Central Office)—Switching center for the local exchange carrier.
Centrex—This service is offered by the LEC to the end user. The feature-rich
Centrex line offers the same features and benefits as a PBX to a customer without
the capital investment or maintenance charges. The LEC charges a monthly fee to
the customer, who must agree to sign a term agreement.