Abandoned/missed call
A call in which the call originator disconnects or cancels the call after a connection has been made, but before the call is established.
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Conference call
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.
CLI
Calling Line Identification (CLI) is the telephone number of the remote caller in an incoming call scenario. This feature permits the recipient of an incoming call to determine, even before answering, the number from which the incoming call is being placed.
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A tandem call is a connecting call in a telephone network, coming into a switch through one line trunk and transferred out again through another.
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