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Address book

A database used for storing entries called contacts, which consists of a few standard fields (such as first name, last name, address, and telephone number), and is usually listed in alphabetical order.


A mechanism that represents data by measurement to a continuous physical variable, such as voltage or pressure.

Auto attendant

A feature that allows callers to be automatically transferred to an extension without the intervention of an operator or receptionist.

Cloud storage

A model of networked enterprise storage where data is stored not only in the user’s computer, but in virtualized pools of storage which are generally hosted by third parties, such as a hosting company.

Call forwarding

A service feature, available in some switching systems, where calls can be rerouted automatically from one line to another, or to an attendant. Note: Call forwarding may be implemented in many forms.

Call hold

A service feature in which a user may retain an existing call while accepting or originating another call using the same telephone.

Call record

Recorded data pertaining to a single call.

Call transfer

A feature that allows the telephone operator to transfer an existing call to another terminal or device.

Call waiting

Rather than giving the caller a busy signal, a service feature that provides an indication to a terminal or device already engaged in a phone call, that one or more calls are waiting to be answered.

Caller ID

A network service feature that permits the recipient of an incoming call to determine, even before answering, the number from which the incoming call is being placed.

Call abandon

A call in which the call originator disconnects or cancels the call after a connection has been made, but before the call is established.

Conference calling

A service feature that allows a call to be established among three or more stations in such a manner that each of the stations is able to communicate with all the other stations.

Do not disturb

A feature that prevents calls from ringing on an extension and may include directing the call to a pre-assigned extension (like a secretary or assistant), busy signal, or recorded message generated by the telephone switch.

Digital network

A network that uses both digital transmission and digital switching.


A book or database listing individuals or organizations alphabetically or thematically with details such as names, addresses, and telephone numbers.

Direct inward dialing

A service feature that allows inward-directed calls to a private telephone switchboard, to reach a specific extension without human intervention.