Abstract: A call completion analysis system may be coupled to monitor any of many different kinds of telephone transmission equipment which may use any of a great variety of different kinds of signaling methods. At least one of the monitored equipments being a T-type carrier having a plurality of channels. The system receives and analyzes the variety of signals, including signals on any selected ones or all of the T-type carrier channels. At least some of the analyzed signals relate to call initiation, dial digits, duration, call completion and call abandonment conditions. The system gives both machine and human supervision and read out of the analyzed signals. Calls automatically forwarded to common carriers are monitored to insure correct billing by the office furnishing service to the call.