Dropped-call rate  From Wikipedia, the free encyclopedia Jump
to: navigation, search  In telecommunications, the dropped-call
rate (DCR) is the fraction of the telephone calls which, due to
technical reasons, were cut off before the speaking parties had
finished their conversation and before one of them had hung up
(dropped calls) This fraction is usually measured as a
percentage of all calls.  A call attempt invokes a call setup
procedure, which, if successful, results in a connected call. A
connected call may be terminated (disconnected) due to a
technical reason before the parties making the call would wish
to do so (in ordinary phone calls this would mean before either
of the parties has hung up). Such calls are classified as
dropped calls. In many practical cases this definition needs to
be further expanded with a number of detailed specifications
describing which calls exactly are counted as dropped, at what
stage of the call setup procedure a call is counted as
connected, etc. In modern telecommunicati