Abstract: In an apparatus, a passive equipment is designed to transmit informations on a telephone line, indicating energization of the apparatus, hook-off condition, insertion of a prepaid credit, collection of part of the credit, or operating anomalies. An active equipment is located to be inaccessible to the public and close to the central office, and performs establishment, holding and management of telephone communications seized by the apparatus, in order to perform a permanent check on the conformity of various phases of a communication and to ensure dependance of continued communication upon information transmitted by the apparatus. On the telephone line, the information is transmitted within a frequency band differing from the communication frequency (voice) band so as not to affect the communication signals.

Abstract: The apparatus comprises a post anchored to the ground including a closable compartment containing a removable coin box, and a container attachable to the post. The post comprises means for concomitantly opening the compartment, extracting the coin box from the compartment and releasing the container from the post for access to internal means included in the post and the container. The apparatus has only a single entrance for access to the coin box compartment and internal means, thus providing effective protection to the interior of the apparatus at low cost.