A method of processing prepaid telephone calls

Abstract: A method of processing prepaid telephone calls from ordinary telephone sets using secret code numbers marked on cards available for purchasing by the public, thus replacing the coin/magnetic-cards/credit-cards based system.

Description: FIELD OF THE INVENTION The present invention generally relates to telecommunication, and more particularly to communication from public telephone booth terminals, i.e. to prepaid calls. BACKGROUND OF THE INVENTION Great efforts, investments and sophistication have been expended in providing efficient and convenient telephone booth telecommunication service for the benefit of the public at large. Among the most recent developments is the introduction of magnetic cards that are designed to replace the coin operated public telephone instruments. This was a result of the recognition that coin operated instruments suffer great many disadvantages in that the user has to be in possession of suitable number of coins on the one hand and on the other hand the instruments required frequent servicing and were liable to vandalism and thefts. The magnetic card operated instruments (also known as a TELECARD), including in the present context also the credit card operated telephones, partly solved the problem in the sense that an article -- in the form of a single card -- could serve for a greater number of calls. However, this method involved a significant initial investment in equipment, installation and maintenance. In addition, the large amount of discarded magnetic cards has been recognized to develop an ecological nuisance. In U.S. Patent No. 4,706,275, a method and system for processing prepaid telephone calls has been proposed, based on special, certifiable code numbers, allocated to the calling parties against purchasing of credits. The credit amounts were stored in the computer of special central stations, thus enabling calls to be made from any ordinary, private telephone. This method, however, suffered a major inherent disadvantage in that the interested public had to undergo a series of preparatory steps -- mostly via credit card companies -- in order to become entitled to the benefits thereof. It is therefore the main object of the present invention to enable the processing of prepaid telephone calls which, on the one hand, will overcome the disadvantages of both the coin/magnetic card operated public telephone booth extensions and, on the other hand, will render redundant any previous connection with any kind of organization, be it the telephone and/or credit card companies. It is a further object of the invention to enable the processing of prepaid telephone calls by purchasing a blank ticket, envelope or the like, bearing an invisible -- but readily exposable -- secret code number (SCN) which enables access to a local public automatic telephone exchange (PABX), pre-programmed for processing such calls for a predetermined length of time (counter pulses). SUMMARY OF THE INVENTION According to the invention there is provided a method of processing prepaid telephone calls, particularly for use in connection with public telephones, comprising the steps of programing the respective Public Automatic Branch exchange (PABX) to become toll-free accessible for incoming calls through dialling any one out of a series of predetermined numbers stored in a data-bank of the PABX, enabling the calling party to complete the connection with the called party, cutting-off the said connection after a prefixed time/counter pulses interval, erasing from the data-bank any number that has once been dialled, marking the said series of numbers, each on a vendible carrier member in an invisible - however readily exposable - manner, and offering the vendible carrier members for sale to the general public, so that the purchaser of a carrier member, after exposing the respective number, is enabled to place a call for the duration of the said interval. The method may further comprise the step of first dialling a toll-free access number of the PABX. Preferably, the said vendible carrier members are in the form of cards or tickets, said number being imprinted thereon and covered by a layer of a removable, opaque coating. The conception lying at the base of the present invention can be put into practice in various manners as will be described hereinbelow. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Any member of the public, who intends to use a public (or private -- see below) telephone will first purchase one or more cards which are valid for prepaid calls according to a selection of rates, say from 1 to 20 or more counter pulses. Every card will bear, in a non-exposed fashion, a secret code number (SCN) composed of a suitable number of digits, depending on the programing facilities of the PABX. The SCN will be selected, at random, out of a series of numbers which differ from the bulk of the relevant subscriber numbers. Such SCN may include, as a prefix, the relevant toll-free number (800 as in the U.S.), and one or more identification combinations that are common to the whole series. The SCNs will be printed on the cards by a reliable, official printing house in a computerized manner. The number will be covered by a layer of an opaque coating, which can be easily peeled off (e.g. by scratching with a coin as in lottery tickets). Telephone booths will no longer be equipped with the expensive, specially designed and constructed telephone instruments, but rather with ordinary telephone sets similar to those of private subscribers. The PABX will be programmed to allow a special path of connection upon identifying a call dialled by any one of the SCN series. It will also identify and analyze the prepaid amount of the respective SCN, and thus clear the path for the following subscriber number dialling, for a limited length of time (or number of counter pulses) represented by the prepaid amount, at the end of which the line will automatically be cut-off. Optionally, a recorded message will warn the calling party before the lapse of the allowed time interval, and programmed to hold the line for a time sufficient to prolong the conversation by dialling another SCN. Alternatively -- or in addition -- the available connection time can be shown on a monitor of the telephone set, again allowing the calling party to extend the connection time by repeating the procedure of dialling a SCN out of a separate card. On the other hand, in the event that a part of the allowed time is not to be used by the calling party, a respective credit can be recorded to his benefit, e.g. by dialing his private telephone number before the expiration of such uncompleted time interval exploitation. Obviously, a SCN that has been once used is automatically erased from the SCN data-bank of the PABX. Periodical replacement of all the SCN cards may also become necessary, requiring the public to exchange, free of charge, the inventory of cards in their possession. The distribution of the SCN cards will be based on the same commercial arrangement as it exists today with respect to coins or the telephone magnetic cards. The advantages of the method according to the invention are self explanatory. The costs of the telephone booth sets will be dramatically reduced by using standard telephones (perhaps with a protecting casing). In fact, the use of the SCN method will also facilitate the use of private or subscriber telephones, such as in cases where one wishes to use somebody else's private phone in exchange for a SCN card -- rather than offering to pay the costs of such call. It will be readily appreciated by those skilled in the art to which the present invention pertains that numerous variations and modifications can be applied to the conceptual approach of the method according to the present invention without departing from its scope as defined in and by the appended claims.

Claims: A method of processing prepaid telephone calls, particularly for use in connection with public telephones, comprising the steps of - (a) programming a respective Public Automatic Branch exchange (PABX) to become toll-free accessible for incoming calls through dialling any one out of a series of predetermined numbers stored in a data-bank of the PABX; (b) enabling a calling party to complete a connection with a called party; (c) cutting-off the said connection after a prefixed time/counter pulses interval; (d) erasing from the data-bank any number that had once been dialled; (e) marking the said series of numbers, each on a vendible carrier member in an invisible - however readily exposable - manner; and (f) offering the vendible carrier members for sale to the general public, so that purchasers of the carrier members, after exposing the respective number, are enabled to place a call for the duration of the said interval. The method of Claim 1 further comprising the step of first dialling a toll-free access number of the PABX. The method of Claim 1 wherein remaining amounts of the said interval are currently displayed to the calling party. The method of Claim 3 wherein a remaining amount of an interval, at the end of an outgoing call, is creditable to a selected subscriber account by further dialling its telephone number. The method of Claim 1 wherein the said vendible carrier members are in the form of cards, said number being imprinted thereon and covered by a layer of a removable, opaque coating. The method of Claim 1 wherein the said vendible carrier members are in the form of cards placed in a sealed envelope.

Inventors: FROMER SHMUEL, FROMER, SHMUEL
Applicants: FROMER SHMUEL, FROMER, SHMUEL
Application year: 1993
Main classification: H04M17
IPC codes: G07F7, H04M17