ES530736A0 - Perfeccionamientos en los sistemas telefonicos - Google Patents

Perfeccionamientos en los sistemas telefonicos

Info

Publication number
ES530736A0
ES530736A0 ES530736A ES530736A ES530736A0 ES 530736 A0 ES530736 A0 ES 530736A0 ES 530736 A ES530736 A ES 530736A ES 530736 A ES530736 A ES 530736A ES 530736 A0 ES530736 A0 ES 530736A0
Authority
ES
Spain
Prior art keywords
telephone systems
telephone
systems
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.)
Granted
Application number
ES530736A
Other languages
English (en)
Other versions
ES8502826A1 (es
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.)
Italtel SpA
Original Assignee
Italtel SpA
Italtel Societa Italiana Telecomunicazioni SpA
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 Italtel SpA, Italtel Societa Italiana Telecomunicazioni SpA filed Critical Italtel SpA
Publication of ES530736A0 publication Critical patent/ES530736A0/es
Publication of ES8502826A1 publication Critical patent/ES8502826A1/es
Expired 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)
  • Telephone Function (AREA)
  • Interface Circuits In Exchanges (AREA)
ES530736A 1983-03-21 1984-03-16 Perfeccionamientos en los sistemas telefonicos Expired ES8502826A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT8320173A IT1207459B (it) 1983-03-21 1983-03-21 Lucchetto elettronico per lineaa telefonica d'utente.

Publications (2)

Publication Number Publication Date
ES530736A0 true ES530736A0 (es) 1985-02-01
ES8502826A1 ES8502826A1 (es) 1985-02-01

Family

ID=11164410

Family Applications (1)

Application Number Title Priority Date Filing Date
ES530736A Expired ES8502826A1 (es) 1983-03-21 1984-03-16 Perfeccionamientos en los sistemas telefonicos

Country Status (4)

Country Link
EP (1) EP0126496A3 (es)
DE (1) DE126496T1 (es)
ES (1) ES8502826A1 (es)
IT (1) IT1207459B (es)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8516398D0 (en) * 1985-06-28 1985-07-31 Newell T J Telephone line access control
FR2595526A1 (fr) * 1986-03-07 1987-09-11 Centomo Jean Louis Dispositif antiviol de ligne telephonique
WO1987007800A1 (en) * 1986-06-13 1987-12-17 Keith Askham Telephone security system
FR2621437B1 (fr) * 1987-10-01 1990-01-05 Genin Jacques Dispositif de protection de ligne telephonique a dipole actif
FR2655224B1 (fr) * 1989-11-24 1995-06-02 Marc Regnier Dispositif de protection d'une ligne d'abonne contre un branchement illicite.
EP0454262A1 (en) * 1990-04-26 1991-10-30 Koninklijke KPN N.V. Electronic circuit for signalling and/or preventing improper use of a telephone subscriber line
ES2070053B1 (es) * 1992-12-10 1997-02-16 Solac Telecom Sa Telefono con discriminador de llamadas.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1569257A (en) * 1975-11-17 1980-06-11 Murray L Q Of a telephone instrument telephone security device for preventing unauthorised use
AU525240B2 (en) * 1977-08-01 1982-10-28 Peter Samuel Vogel Telephone security system
CH628762A5 (de) * 1978-06-12 1982-03-15 Sodeco Compteurs De Geneve Schaltungsanordnung fuer fernsprechteilnehmerstellen zur erfassung von waehlimpulsen.
GB2086187A (en) * 1980-10-09 1982-05-06 Standard Telephones Cables Ltd Toll barring
US4358640A (en) * 1980-11-25 1982-11-09 Murray Leonard Q Telephone security device

Also Published As

Publication number Publication date
DE126496T1 (de) 1985-02-28
ES8502826A1 (es) 1985-02-01
IT1207459B (it) 1989-05-25
EP0126496A3 (en) 1985-05-15
EP0126496A2 (en) 1984-11-28
IT8320173A0 (it) 1983-03-21

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19981001