Abstract: In order to provide call data monitoring for an Automatic Electric step-by-step switching system, the identification of the line number of a calling subscriber line in a group of subscriber lines is accomplished by identifying which of the line finders for that group has been selected by detecting a marked location in the selected line finder corresponding to the calling subscriber line and by detecting which of the common control relays for the group has selected and controlled the line finder. Identification of the line finder, the marked location and the common control relays are converted into the line number of the calling subscriber and stored as a first item in a call data record. The dialed telephone number of the called subscriber is determined and is stored as a second item in the call data record. The start time of the call is determined and is stored as a third item in the call data record. The duration of the call is determined and is stored as a fourth item in the call data record.

Abstract: An electronic ringer circuit suitable for use as a replacement for, or an alternative to, the electromagnetic ringer of a telephone set and other station apparatus is disclosed. To eliminate bell tap, each of the disclosed arrangements includes a load impedance that is connected across the output terminals of a rectifier-power supply stage until an acceptable ringing signal is detected. The load impedance is then disconnected and the signal provided by the rectifierpower supply stage activates a tone generator stage that drives a piezoelectric transducer. Various arrangements are provided, including configurations for single-party bridged ringing installations, multi-party divided ringing installations, coded ringing for use in situations wherein a number of stations are located in the same acoustic environment, and a multi-line installation such as a small key telephone installation.