System and method for blocking unauthorized outgoing call on a communication network

Abstract

The various embodiments herein provide a system and method for blocking unauthorized outgoing calls made by an unauthorized user. The system is programmed by the user to block any attempt made to call an unauthorized number. Incase of a landline system, the system is connected to a telephone line that powers up the unit from the landline and blocks any unauthorized outgoing calls. The system is programmed to inhibit dialing any prefixes or any individual numbers. The system disconnects the phone line from the network and does not allow continuation of dialing when the prefix or the dialing number matches with the unauthorized dialing list/database.

What is claimed is: 
     
         1 . A system for blocking unauthorized outgoing calls, the system comprising:
 a voltage converter for converting a supply voltage from a telephone line to +5V DC;   a first circuit for disconnecting a telephone line, and wherein the first circuit is a line break control circuit;   a second circuit for saving power for a pre-determined time period, and wherein the second circuit is a power saver circuit;   a microcontroller comprising a list of unauthorized numbers, and wherein the list of unauthorized numbers are saved on an EEPROM memory of the microcontroller;   a tone decoder circuit for decoding a dual-tone-multi-frequency (DTMF) tones from the telephone line, and wherein the decoded dual-tone-multi-frequency (DTMF) tones are sent to the microcontroller;   a pulse detector for detecting a dialing pulse on the telephone line, and wherein the detected dialing pulse is sent to the microcontroller;   a beep generator for providing a feedback in the form of a tone for accepting a command during a programming operation;   a LED controller for providing a visual indication for indicating an ON/OFF status of the system;   a reset circuit for switching the system to a default mode; and   an ISP programming interface for providing a programming and a reprogramming capability to the microcontroller.   
     
     
         2 . The system according to  claim 1 , wherein the list of unauthorized numbers is protected by a password, and wherein the password is allowed to be changed only by the authorised user of the system. 
     
     
         3 . The system according to  claim 1 , wherein the microcontroller determines a dialed number by the dialing pulse received from the pulse detector circuit and a plurality of decoded dual-tone-multi-frequency (DTMF) tones received from the tone decoder circuit. 
     
     
         4 . The system according to  claim 1 , wherein the microcontroller compares the dialed number with the list of unauthorized numbers saved in the EEPROM memory for each time a dialing process is initiated, and wherein the microcontroller sends a command to the first circuit to disconnect a call, when the dialed number does not match with the list of stored unauthorized numbers saved in the EEPROM memory. 
     
     
         5 . The system according to  claim 1 , wherein the first circuit disconnects the telephone line after a pre-determined time period for an unauthorized call attempt. 
     
     
         6 . The system according to  claim 1  is connected in series with the telephone line, and wherein the system comprises at-least two wires for connecting in series with the telephone line. 
     
     
         7 . The system according to  claim 1 , wherein the system is installed to a telephone terminal point for blocking an unauthorized outgoing call from the plurality of telephones connected to the terminal point. 
     
     
         8 . The system according to  claim 1 , wherein the system is installed to a telephone line for blocking the unauthorized outgoing call from the plurality of telephones connected to a respective telephone line. 
     
     
         9 . The system according to  claim 1 , wherein the system is installed to a particular telephone for blocking all the unauthorised outgoing calls from the particular telephone. 
     
     
         10 . The system according to  claim 1 , wherein the password is changed to default, when the system is switched to default mode. 
     
     
         11 . The system according to  claim 1 , wherein the list of numbers to be blocked is erased from the EEPROM memory, when the system is switched to default mode. 
     
     
         12 . A method for blocking unauthorized outgoing calls, the method comprises the steps of:
 setting a password for the system;   accessing the system by entering a password;   erasing a previous data from an EEPROM memory of the system;   loading a list of unauthorised numbers to the EEPROM memory;   initialising a phone call by dialing a number in a telephone;   comparing a dialed number with the list of unauthorised numbers stored in the EEPROM memory; and   blocking the phone call when the dialed number matches with a number in the list of unauthorised numbers stored in the EEPROM memory.   
     
     
         13 . The method according to  claim 12 , wherein an authorized user provides a password to access the system, and wherein the authorized user provides one or more commands to re-program the system. 
     
     
         14 . The method according to  claim 12 , further comprises executing an application in a microcontroller for blocking unauthorized calls in a cellular communication device, and wherein the application is installed in the cellular communication device, and wherein the cellular communication device is selected from a group consisting of a Mobile phone, Smartphone, Palm top, tablet, for block unauthorised outgoing calls.