WO2004107720A1 - Procede et moyen permettant d'administrer des communications sur une ligne - Google Patents

Procede et moyen permettant d'administrer des communications sur une ligne Download PDF

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Publication number
WO2004107720A1
WO2004107720A1 PCT/ZA2004/000058 ZA2004000058W WO2004107720A1 WO 2004107720 A1 WO2004107720 A1 WO 2004107720A1 ZA 2004000058 W ZA2004000058 W ZA 2004000058W WO 2004107720 A1 WO2004107720 A1 WO 2004107720A1
Authority
WO
WIPO (PCT)
Prior art keywords
user equipment
line
code
administration
authorisation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/ZA2004/000058
Other languages
English (en)
Inventor
Selvanathan Narainsamy
Andrew Gary Wright
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to ZA200408802A priority Critical patent/ZA200408802B/en
Publication of WO2004107720A1 publication Critical patent/WO2004107720A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/38—Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections
    • H04M3/382—Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections using authorisation codes or passwords
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/667—Preventing unauthorised calls from a telephone set
    • H04M1/67—Preventing unauthorised calls from a telephone set by electronic means

Definitions

  • This invention relates to a method and means of administering communications on a line and it will be described with specific reference to the administration of communication on a land-based telephone line. It will be appreciated, however, that this is not intended to restrict the application of the invention to landline telephone communications.
  • South African Patent No. 2002/4083 describes and claims line administration apparatus that, in effect automates the normally manual process of barring and unbarring telephone lines as a means, primarily, of reducing so-called "clip-on fraud" in which a perpetrator clips a telephone instrument onto an un-barred line and makes unauthorised calls at the expense of the subscriber in respect of that line.
  • This invention seeks to incorporate line maintenance and testing functionality into the line administration apparatus of South African Patent No. 2002/4083.
  • This invention provides a method of administering communications on a line extending between administration and user equipment, the method comprising the steps of:
  • the method of administering communications on a line relies on conventional means of seizing and releasing a communications line such that no communication is possible on the line when seized and communication is only possible once the line has been released for communication.
  • the authorisation code received is compared with the administration equipment records in respect of the user equipment to determine whether or not the authorisation code is valid for that user equipment.
  • the periodicity of the changes made to the authorisation code of a particular item of user equipment may vary from nil to frequent. So, for instance, the authorisation code could require changing only when an operator determines that the authorisation code for that piece of user equipment may have been compromised. In this example, the user equipment authorisation code will be changed to counter any possible breach of the security of the user equipment authorisation code, but if no such breach occurs, then no change will be necessary.
  • the user equipment authorisation code could be changed more frequently, whether manually or automatically.
  • the system described and claimed in South African Patent No. 2002/4083 lends itself to the use of code hopping techniques in which the user equipment authorisation codes are changed with the use of an encryption algorithm embedded in the user equipment.
  • the user equipment authorisation code changes automatically from time to time, for instance, each time the user equipment is used and the keys used to generate the changing user equipment authorisation codes are duplicated or regenerated in the administration equipment to enable the administration equipment to determine whether or not the changing authorisation codes are valid for the user equipment concerned.
  • the method of this invention lends itself to use with such code hopping techniques in that the method may include the step of periodically transmitting a different user equipment authorisation code generating key to the user equipment and the administration equipment.
  • the user equipment authorisation codes are changed from a point or site remotely of the item of user equipment concerned.
  • the remote site may be situated in the administration equipment, but this is not necessary and the remote site could be located remotely of both the user equipment and the administration equipment, thereby further enhancing the security of the system.
  • the invention includes apparatus for the administration of communications on a line extending between administration and user equipment, the apparatus comprising:
  • the apparatus of this invention may be adapted for use with code hopping systems by the inclusion of means adapted periodically to transmit a different user equipment authorisation code generating key to the user equipment and the administration equipment.
  • the means to change the user equipment authorisation codes may be situated in the administration equipment, but in an alternative form of the invention the code changing means may be located remotely of both the user equipment and the administration , equipment.
  • the communication line may conveniently be constituted by a physical line or cable normally intended for the transmission of communication signals.
  • the invention is, however, intended to extend to a communication line constituted by a communication channel other than a physical line, such as, for instance, a radio frequency communication channel extending terrestrially, between terrestrial- and satellite-based communication equipment or both.
  • the apparatus is intended for the administration of communications on a telecommunication line, the administration equipment being located at a telephone exchange and the user equipment being constituted by a code transmission device or module located in or near a telephone set.
  • the code transmission module may be provided as a plug-in facility adapted for location closely adjacent the telephone.
  • the code transmission module may be located within the housing in which the pay phone apparatus is normally secured. In this way, the pay phone and the line extending between the pay phone and the exchange may be protected against fraudulent use.
  • the code transmission module may be used to perform a number of functions other than simply transmitting authorisation codes to the administration equipment in the exchange and the method and apparatus of the invention are intended to incorporate such additions.
  • the administration equipment may be adapted periodically to transmit a test code to the code transmission module,-which is adapted to switch to a test mode on receipt of the test code, in which test mode the code transmission module is adapted to receive one or more test signals transmitted to the code transmission module from the administration equipment, to perform the test associated with each test signal and to transmit the results of the test to the administration equipment.
  • the existing line barring facility is incorporated in the equipment at the exchange. Using such a facility, the line is normally barred and the line barring facility interrogates the normally barred line for an authorisation code when a communication is initiated by a user using user equipment such as a compatible telephone instrument. To unbar the line, the telephone user is then required to enter the correct authorisation code by means of the telephone keypad.
  • the exchange equipment is adapted to detect the change in line current that occurs when the telephone handset is lifted and to await the receipt of the authorisation code which will normally be transmitted as a series of Dual Tone Multi Frequency (DTMF) tones from the telephone to the exchange.
  • DTMF Dual Tone Multi Frequency
  • the exchange equipment On receipt of the appropriate authorisation code, the exchange equipment unbars the line.
  • the exchange equipment detects the change in line current and automatically bars the line once again.
  • the code transmission module 10 forming part of the administration apparatus described and claimed in South African Patent No. 2002/4083 is illustrated in the drawing.
  • the code transmission module 10 is adapted for location closely adjacent a telephone instrument 12 and is interposed in the telephone line 14 between the telephone instrument 12 and the telephone exchange 15 (not shown) by way of telephone jacks 28 and 30.
  • a current sensor 16 is used to detect the change in line current that occurs when the telephone handset (not shown) is lifted off the handset cradle (indicated by a normally open switch 18).
  • a processor unit 20 is programmed to seize the line 14 when the current sensor 16 detects current on the line 14 indicating that the handset has been lifted off the cradle 18. The line is seized by means of a line seizing mechanism 22.
  • the processor 20 activates a DTMF interface 24 that transmits a valid authorisation code, as a DTMF tone signal, to the exchange 15 by way of the line 14.
  • a valid authorisation code as a DTMF tone signal
  • the current sensor 16 senses the change in line current.
  • the processor seizes the line by means of the line seizing mechanism 22 and transmits a barring code down the line 14 by means of the DTMF interface 24.
  • the line barring facility 17 in the exchange 15 bars the line against further use, thereby returning the line 14 to its normally barred state.
  • the code transmission module 10 is adapted for location closely adjacent the telephone instrument 12. This will ensure that that any person wishing to make unauthorised use of the line 14 must, of necessity, interrupt or clip onto the line downstream of the code transmission module 10, that is between the exchange 15 and the code transmission module 10. However, at any point between the exchange 15 and the code transmission module 10, the line 14 will have been secured, since a person clipping onto the line 14 will be met with a normally barred line and to unbar the line 14, it will of course be necessary to know and transmit the authorisation code down the line 14.
  • the code transmission module 10 may be provided with a code hopping facilities, a code encryption technique adapted periodically to generate a different code, for instance, each time the telephone 12 is used.
  • the line barring facility 17 at the exchange 15 will be provided with suitable decryption facilities.
  • the line 14 can be secured against replay attacks - attempted fraudulent use of the line 14 in which a person tapping or listening in on the line 14 records the unbarring code and then replays or retransmits the code information to the exchange 15.
  • the system may be used to secure pay phones.
  • This invention which relates to an improvement in the invention described and claimed in South African Patent No. 2002/4083 makes use of the code transmission module described above and provides additional functionality by the provision of a control centre 100 located remotely of the code transmission module 10.
  • the system of this invention can be used to administer communications on the network of which the line 14 forms a part by maintaining all the lines 14 in a state in which the lines 14 are barred against the transmission of normal communication on the lines 14.
  • Each code transmission module 10 is then used to monitor its line 14 for the initiation of communication from the user handset situated at the code transmission module 10 end of the line, the current sensor 16 being used to detect the change in line current that occurs when the telephone handset is lifted off the handset cradle (indicated by a normally open switch 18).
  • the line is then seized by means of a line seizing mechanism 22, in the manner described above and the code transmission module 10 then automatically transmits its pre- programmed authorisation code to the exchange 15 serving the code transmission module 10.
  • the authorisation code so transmitted is compared with the exchange's records in respect of the code transmission module 10 to determine whether or not the authorisation code is valid for that code transmission module 10 and its associated user equipment or handset. If it is, the line is released for normal communication.
  • the control centre 100 is connected to the network of which the line 14 forms a part and different authorisation codes can be transmitted periodically to one or more of the code transmission modules 10 on the network using transmission equipment 102 located at the control centre 100. "
  • the control centre 100 can be " situatecfat the exchange 15 or exchanges serving the network of which the line 14 forms a part, but this is not necessary.
  • control centre 100 it might be better for the control centre 100 to be located remotely of both the code transmission modules 10 on the network and the exchange or exchanges serving the code transmission modules 10, since this will further enhance the security of the system.
  • the periodicity of the changes made to the authorisation codes of the code transmission modules 10 on the network may vary from no changes in a given period of time to frequent changes within that period, depending on the security regime required by the network operator.
  • the code transmission module authorisation codes could be kept constant and changed only when the operator determines that the authorisation code for a particular piece of user equipment may have been compromised.
  • the code . transmission module authorisation code will be changed to counter any possible breach of the security of the user equipment or the authorisation code, but if no such breach occurs, then no change will be necessary.
  • the code transmission module authorisation code could be changed more frequently, preferably automatically by means of a predetermined programme of code changes initiated from the control centre 100.
  • This code changing programme does not require code hopping and is simply a method of ensuring that the code transmission modules 10 on the network have their authorisation codes updated regularly.
  • each of the code transmission modules 10 on the network will be programmed with a key that is used within the code hopping encryption algorithm so that, in use, the authorisation codes of the code transmission modules 10 oh the network change automatically from time to time, for instance, each time the user equipment associated with a code transmission module 10 is used.
  • the keys used to generate the changing code transmission module authorisation codes are duplicated or regenerated in the exchange serving each code transmission module 10 to enable the exchange equipment to determine whether or not the changing authorisation codes are valid for each of the code transmission modules 10 on the network.
  • the method of this invention lends itself to use with such code hopping techniques in that the control centre 100 can now be used to periodically transmit a different key to one or all of the code transmission modules 10 on the network.
  • control centre 100 will transmit duplicate or complementary keys to the exchange serving the code transmission modules concerned, thereby providing complementary keys to the barring facility 17 at the exchange 15 to enable synchronisation of the code transmission modules 10 on the network with the barring facility 17.
  • the code* transmission module may be used to perform a number of functions other than simply transmitting authorisation codes to exchange serving the code transmission module 10.
  • the code transmission modules 10 on the network are located at the end of the lines 14 associated therewith and the code transmission modules 10 are capable of communication with the exchange 15 and the control centre 100. This enables the network operator to monitor, test and undertake a number of maintenance functions on the entire line 14 associated with each code transmission module 10 and its associated subscriber equipment.
  • the code transmission module 10 By programming the code transmission module 10 to receive, recognise and respond to one or more test codes transmitted eitherfrom the exchange serving the code transmission module 10 or the control centre 100, the code transmission module 10 can be used to perform useful remote administration of the network.
  • the code transmission module 10 can be programmed to switch to a general test mode on receipt of a general test code transmitted to the code transmission module 10 by the network operator, either from the exchange serving the code transmission module 10 or from the control centre 100.
  • the code transmission module 10 can then be programmed to receive and respond to a number of specific test signals.
  • the network operator can, for instance, cycle the code transmission module 10 through one or more tests by transmitting an appropriate test code to the code transmission module 10.
  • the code transmission module 10 can, on receipt of the appropriate code, test for:
  • DC LOOP CURRENT - OFF HOOK SIGNAL - simulate closing of the handset switch 18, which will allow the exchange serving the code transmission module 10 to test the line current;
  • the network operator's specifications e.g. 400Hz modulated by 40Hz - in South Africa
  • the maintenance of the network and the lines forming part of the network are the responsibility of the network operator.
  • the functionality of this invention programmed into the code transmission module 10 it is possible for the network operator to determine whether or not there are any faults on the line 14 that might fall within its ambit of responsibility.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)

Abstract

Avec les installations de blocage de lignes téléphoniques classiques, la ligne est normalement bloquée, et l'installation de blocage de lignes exige de la ligne normalement bloquée un code d'autorisation lorsqu'une communication est lancée à l'aide d'un instrument téléphonique compatible. Afin de débloquer la ligne, l'utilisateur du téléphone doit entrer un code d'autorisation au moyen du clavier de son téléphone. Il est possible d'automatiser ce processus, au moyen d'un module de transmission de code (10), qui est adapté pour être placé à proximité immédiate d'un instrument téléphonique (12) et est interposé, dans la ligne téléphonique (14), entre l'instrument téléphonique (12) et le central téléphonique (15) (non illustré), au moyen de prises de téléphone (28, 30). Le module de transmission de code (10) peut être doté d'une fonction de saut de code. Pour la mise en oeuvre du processus susmentionné, un centre de commande (100) est situé à distance du module de transmission de code (10). Ledit centre de commande (100) est connecté au réseau dont la ligne (14) fait partie, et différents codes d'autorisation peuvent être transmis périodiquement à un ou plusieurs des modules de transmission de codes (10) sur le réseau, au moyen d'un matériel de transmission (102) situé au niveau du centre de commande (100). Le centre de commande (100) peut être situé au niveau du ou des centraux (15) desservant le réseau dont la ligne (14) fait partie, mais cela n'est pas obligatoire, et il peut être plus avantageux que le centre de commande (100) soit situé à distance aussi bien des modules de transmission de code (10) sur le réseau que du ou des centraux desservant les modules de transmission de code (10), car cela a pour effet d'améliorer encore la sécurité du système.
PCT/ZA2004/000058 2003-05-28 2004-05-28 Procede et moyen permettant d'administrer des communications sur une ligne Ceased WO2004107720A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA200408802A ZA200408802B (en) 2004-05-28 2004-11-05 Method and means of administering communication on a line

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200304123 2003-05-28
ZA2003/4123 2003-05-28

Publications (1)

Publication Number Publication Date
WO2004107720A1 true WO2004107720A1 (fr) 2004-12-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2004/000058 Ceased WO2004107720A1 (fr) 2003-05-28 2004-05-28 Procede et moyen permettant d'administrer des communications sur une ligne

Country Status (1)

Country Link
WO (1) WO2004107720A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4897875A (en) * 1986-09-04 1990-01-30 The Manitoba Telephone System Key management system for open communication environments
EP0841828A2 (fr) * 1996-11-12 1998-05-13 Nokia Mobile Phones Ltd. Système et procédé de restitution de données d'une base de données
GB2343087A (en) * 1997-07-25 2000-04-26 Jw & Ll Enterprises Pty Ltd A security apparatus for a telephone line and a method for securing a telephone line

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4897875A (en) * 1986-09-04 1990-01-30 The Manitoba Telephone System Key management system for open communication environments
EP0841828A2 (fr) * 1996-11-12 1998-05-13 Nokia Mobile Phones Ltd. Système et procédé de restitution de données d'une base de données
GB2343087A (en) * 1997-07-25 2000-04-26 Jw & Ll Enterprises Pty Ltd A security apparatus for a telephone line and a method for securing a telephone line

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