Abstract: The present invention relates to a device for starting telephone charging in a pay phone.The starting device essentially comprises a scrambler circuit (42) which is inserted in the line (26) when the handset is taken off-hook and which is inhibited only when the user actuates a pushbutton (20), and a microphone inhibit circuit (40) which is inserted when the user dials the called number and which inhibits simultaneously with the circuit (42). Charging begins when the button (20) is actuated.

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: In one embodiment, an answer supervision detection unit is disposed intermediate a tandem switch and the public switched network. Typically, the public switched network is two or four wire E & M lines or T1 lines. The E & M lines carry answer supervision information signals. The answer supervision detection unit monitors the E & M lines, detects the information signals, converts those information signals into coded answer supervision signals, and applies those coded signals to loop start lines that extend from the answer supervision detection unit to the tandem switch, the central office owned by the regional Bell operating system and the customer owned pay telephone. Intermediate the pay telephone and the central office is a decoder that senses the coded answer supervision signals (typically the A,B,C and D signals of the DTMF phone) and generates pseudo-answer supervision or strictly control signals to the customer owned pay telephone.

Abstract: A safety seat stand apparatus for coin-operated telephone sets includes: a stand body with a horizontal portion and a vertical portion having an open receiving chamber formed in the horizontal portion for securing a coin-operated telephone therein; a drawer-type coin box with a first lock device movably provided under horizontal portion in communication with the open receiving chamber; an information panel structure provided on the vertical portion of the stand body for posting various charges and information thereon; and a check member with a second lock device and a press piece closely engaged with the vertical portion of the stand body so as to safely secure the coin-operated telephone set in the open receiving chamber through the second lock device and the press piece; thereby, a coin-operated telephone set combined with the safety seat stand apparatus can be fixed on any solid supporting object for convenient usage.

Abstract: A telephone pay station wherein a disconnect circuit is provided for disconnecting the pay station from the central office in response to the coin collect signal generated at the central office.

Abstract: In an electronic coin telephone set, a fraud prevention arrangement prevents fraudulent coin tones originating at a telephone transmitter from being provided to a central office over a coin subscriber loop. The arrangement comprises a first and second transmission channel for alternately connecting the transmitter to the central office and also a fraud filter disposed in the second transmission channel. The fraud filter attenuates a selected frequency originating at the transmitter that is indicative of coin deposits. When coin deposits are not required by the central office, the transmitter is connected to the central office through the first transmission channel. When coin deposits are required by the central office, however, the arrangement connects the transmitter to the central office through the second transmission channel thereby avoiding the fraudulent generating of coin tones through the telephone transmitter.