AU7517887A - Telephone security system - Google Patents

Telephone security system

Info

Publication number
AU7517887A
AU7517887A AU75178/87A AU7517887A AU7517887A AU 7517887 A AU7517887 A AU 7517887A AU 75178/87 A AU75178/87 A AU 75178/87A AU 7517887 A AU7517887 A AU 7517887A AU 7517887 A AU7517887 A AU 7517887A
Authority
AU
Australia
Prior art keywords
security system
telephone security
telephone
security
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.)
Abandoned
Application number
AU75178/87A
Inventor
Keith Askham
Peter Berger
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
Priority claimed from GB868614457A external-priority patent/GB8614457D0/en
Priority claimed from GB868619562A external-priority patent/GB8619562D0/en
Application filed by Individual filed Critical Individual
Publication of AU7517887A publication Critical patent/AU7517887A/en
Abandoned legal-status Critical Current

Links

Classifications

    • 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
    • H04M1/673—Preventing unauthorised calls from a telephone set by electronic means the user being required to key in a code

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
AU75178/87A 1986-06-13 1987-06-12 Telephone security system Abandoned AU7517887A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8614457 1986-06-13
GB868614457A GB8614457D0 (en) 1986-06-13 1986-06-13 Telephone security system
GB868619562A GB8619562D0 (en) 1986-08-11 1986-08-11 Telephone monitoring system
GB8619562 1986-08-11

Publications (1)

Publication Number Publication Date
AU7517887A true AU7517887A (en) 1988-01-11

Family

ID=26290917

Family Applications (1)

Application Number Title Priority Date Filing Date
AU75178/87A Abandoned AU7517887A (en) 1986-06-13 1987-06-12 Telephone security system

Country Status (2)

Country Link
AU (1) AU7517887A (en)
WO (1) WO1987007800A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2220323A (en) * 1988-03-22 1990-01-04 Philip Malcolm Ballabon Telephone electronic combination lock
GR900100888A (en) * 1990-12-31 1992-11-23 Nikolaos Filippakopoulos Automatic telephone selector
GB2253542B (en) * 1991-03-07 1995-04-26 Itech Limited Improvements in and relating to telephone systems
EP0726006B1 (en) * 1993-10-28 2002-12-18 Maldes Phoenix Limited Telephone bar device
US6332073B1 (en) * 1998-10-19 2001-12-18 Ericsson Inc. Emergency number dialing from a fixed cellular terminal
US6374099B1 (en) * 1999-05-10 2002-04-16 Lucent Technologies Inc. High priority and/or emergency overload access control system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4046965A (en) * 1976-01-26 1977-09-06 International Telephone And Telegraph Corporation Toll restrictor for a time division telecommunication system
GB2086187A (en) * 1980-10-09 1982-05-06 Standard Telephones Cables Ltd Toll barring
GB2104347A (en) * 1981-06-19 1983-03-02 Interaction Resources Limited Improvements in or relating to telephone sets
IT1207459B (en) * 1983-03-21 1989-05-25 Italtel Spa ELECTRONIC PADLOCK FOR USER TELEPHONE LINE.

Also Published As

Publication number Publication date
WO1987007800A1 (en) 1987-12-17

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