PERFECCIONAMIENTOS EN CIRCUITOS PARA UNA INSTALACION TELEFO-NICA CON DEVOLUCION DE LLAMADAS

摘要

Depending on the switching state subscriber terminal busy or subscriber terminal does not respond within a particular time, a junction circuit occupied by a subscriber station calling unsuccessfully is connected to a special message store for recalling which is associated with a message transmission store so that information items required for setting up a recalling connection can be transmitted by the unsuccessful caller by dialling or by voice following the corresponding voice request to the message store for recalling. By changing the switching state at the subscriber terminal unsuccessfully called, the latter is connected to the message store for recalling for transmitting the information items for the recall.