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Terms that are on use on this site.

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There are 138 entries in the glossary.

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Term Definition
Access Carrier (or Customer) Name AbbrevA three-character code assigned to each Interexchange Carrier. Its usual use is to designate which carrier the customer has specified as their primary toll carrier.
Access Code

A short sequence of digits assigned by the a telephone service provider to an individual customer to provide access to a specific service, feature or function of a telecommunications network or computer system.

The five-digit code (used for call destinations within the United States) has the form 10XXX.

The seven-digit code (used for international call destinations) has the form 101XXXX or 950-XXXX.

ADSLSee Asymmetric Digital Subscriber Line.
AIN See Advanced Intelligent Network.
Alternate Billed Call (ABC)A call originating on one line and charged to another, using collect, bill-to-third (Third Number) or calling card.
AMA See Automated Message Accounting.
ANISee Automatic Number Identification.
ANSISee American National Standards Institute.
ASRAutomatic Speech Recognition.
ATISSee Alliance for Telecommunications Industry Solutions.
ATM See Asynchronous Transfer Mode.
Automated Message Accounting (AMA)
  1. The automatic collection, recording and processing of information relating to calls for billing purposes.

  2. The structure inherent in switch technology that initially records telecommunication message information. The industry standard for AMA format is contained in a Telcordia Technologies document, Automated Message Accounting.
Automatic Number Identification (ANI)The number transmitted through the network that identifies the calling party billing telephone number.
B Channel

See Bearer Channel.

BandwidthThe common measure of transmission capacity. For analog transmission, it is measured in cycles per second; for digital transmission, it is measured in bits per second.
Basic Rate ISDN (BRI)A 2-wire line-side local switching system port that uses the 2B1Q line code at a 160 kilobit per second rate to transport overhead and up to two B channels and one D channel.
Bearer Channel (B Channel)A 64 kilobits per second channel used for information transfer.
Beta TestThe stage at which a new product is tested under actual usage conditions. (Alpha testing is conducted in-house.)
Billing Telephone Number (BTN)The ten-digit number, including the area code, to which charges for a given telephone service are billed.
BroadbandA data-transmission scheme in which multiple signals share the bandwidth of a medium such as fiber-optic cable. This allows the transmission of voice, data and video signals over a single medium; for example, cable television uses broadband to deliver dozens of channel signals over a single cable.
Carrier Access Billing System (CABS)System for billing Interexchange Carriers and other service providers for access to the Verizon network.
Carrier Identification Code (CIC)A unique three or four digit access identification code that is assigned by Telcordia Technologies for use with certain switched access services. The CIC identifies the caller's long distance carrier.
Central Office (CO)

A building where end users' lines are joined to switching equipment that connects other end users to each other, both locally and via long distance carriers.

The central office contains the associated inside plant network elements required to perform this function, such as distribution frames, interoffice facility termination points, and so on. Also known as End Office and Entity.

CentrexA class of central office service that provides the equivalent of PBX service from a telephone company switching system. Permits station-to-station dialing, direct inward dialing to a particular station, and station identification on outgoing calls.

An electrical or fiber optic communication path between two or more points of termination.


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