1. A call control signal transmitted by the called data circuit-terminating equipment (DCE) to the calling data terminal equipment (DTE) to report (a) the progress of a call by using a positive call progress signal or (b) the reason why a connection could not be established by using a negative call progress signal.
2. A voiceband tone that is applied… (Read More →)

An audible signal returned by a network to a call originator to indicate the status of a call.
Note: Examples of call progress tones include dial tones and busy signals.

An entity, such as a person, equipment, or program to which a call is directed. Synonym called party.

Recorded data pertaining to a single call.

In communication systems, the time interval from initiation of a clearing signal by a terminal until the available-line condition appears on originating terminal equipment.

A switching system service feature that prevents selected terminals from exercising one or more service features otherwise available from the switching system.

A specific portion of the processing of a call. [T1.667-1999]

The ratio of total call attempts that result in call set-up error to the total call attempts in a population of interest. [T1.504-1989]

The ratio of total call attempts that result in call set-up failure to the total call attempts in a population of interest. [T1.504-1989]

1. The overall length of time required to establish a circuit-switched call between users.
2. For data communication, the overall length of time required to establish a circuit-switched call between terminals; i.e., the time from the initiation of a call request to the beginning of the call message.
Note: Call set-up time is the summation of: (a) call request time--the… (Read More →)