BE822413A - Detecteur pour postes telephoniques - Google Patents

Detecteur pour postes telephoniques

Info

Publication number
BE822413A
BE822413A BE150698A BE150698A BE822413A BE 822413 A BE822413 A BE 822413A BE 150698 A BE150698 A BE 150698A BE 150698 A BE150698 A BE 150698A BE 822413 A BE822413 A BE 822413A
Authority
BE
Belgium
Prior art keywords
detector
telephone stations
stations
telephone
Prior art date
Application number
BE150698A
Other languages
English (en)
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 filed Critical
Publication of BE822413A publication Critical patent/BE822413A/fr

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
    • H04M1/677—Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
    • H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
    • H04M17/023—Circuit arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
BE150698A 1973-11-21 1974-11-20 Detecteur pour postes telephoniques BE822413A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1644673A CH571795A5 (fr) 1973-11-21 1973-11-21

Publications (1)

Publication Number Publication Date
BE822413A true BE822413A (fr) 1975-03-14

Family

ID=4417418

Family Applications (1)

Application Number Title Priority Date Filing Date
BE150698A BE822413A (fr) 1973-11-21 1974-11-20 Detecteur pour postes telephoniques

Country Status (4)

Country Link
BE (1) BE822413A (fr)
CH (1) CH571795A5 (fr)
FR (1) FR2251968A1 (fr)
IT (1) IT1025854B (fr)

Also Published As

Publication number Publication date
DE2365240A1 (de) 1975-05-28
CH571795A5 (fr) 1976-01-15
IT1025854B (it) 1978-08-30
DE2365240B2 (de) 1976-08-05
FR2251968B3 (fr) 1977-08-19
FR2251968A1 (en) 1975-06-13

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