Abstract: A fraud prevention system and method are provided which utilize communication between an intelligent network platform 14 and a local telecommunications device 10. The local telecommunications device 10 comprises a memory 20 which stores various data values. Intelligent network platform 14 comprises a memory 22 which stores a copy of the values in memory 20. The intelligent network platform 14 randomly generates an address which is transmitted to the local telecommunications device 10. The local telecommunications device 10 retrieves data located at the address and transmits the data to the intelligent network platform 14 as an access string prior to the placement of telephone calls using the intelligent network platform 14. The time and day of the telephone call may also be included in the access string to prevent signals recorded at one time from being used to place telephone calls at another time.

Abstract: A unique combination of frequency and time division multiplexed communications is presented to enable bi-directional burst communications between a substantial number of users over a single radio frequency communications channel. A service area for communications is divided into a number of cells, with the cells arranged into clusters. Cells in each cluster are similarly numbered with no two adjacent cells across the service area having the same number. The clusters are also numbered in the same manner. A cellular time division multiplexed waveform is used by the network to carry communications with each cell number and cluster number assigned a time slot. During the time slot corresponding to the cell or cluster number, all cells or clusters having that number will be simultaneously transmitting. This networking technique enables time slots to be reused across the service area.