CH623695A5 - - Google Patents

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Publication number
CH623695A5
CH623695A5 CH587878A CH587878A CH623695A5 CH 623695 A5 CH623695 A5 CH 623695A5 CH 587878 A CH587878 A CH 587878A CH 587878 A CH587878 A CH 587878A CH 623695 A5 CH623695 A5 CH 623695A5
Authority
CH
Switzerland
Prior art keywords
reception
frequencies
relay
frequency
line
Prior art date
Application number
CH587878A
Other languages
English (en)
French (fr)
Inventor
Pierre De Toledo
Original Assignee
Pierre De Toledo
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 Pierre De Toledo filed Critical Pierre De Toledo
Priority to CH587878A priority Critical patent/CH623695A5/fr
Priority to FR7822913A priority patent/FR2427748A1/fr
Priority to DE19792952814 priority patent/DE2952814A1/de
Priority to GB8003187A priority patent/GB2037540B/en
Priority to PCT/CH1979/000076 priority patent/WO1979001145A1/de
Priority to SE8000586A priority patent/SE420555B/sv
Publication of CH623695A5 publication Critical patent/CH623695A5/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
    • H04M1/663—Preventing unauthorised calls to a telephone set
    • H04M1/665—Preventing unauthorised calls to a telephone set by checking the validity of a code

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Alarm Systems (AREA)
CH587878A 1978-05-30 1978-05-30 CH623695A5 (sv)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CH587878A CH623695A5 (sv) 1978-05-30 1978-05-30
FR7822913A FR2427748A1 (fr) 1978-05-30 1978-07-28 Dispositif de controle des appels telephoniques arrivant a une station d'abonne
DE19792952814 DE2952814A1 (de) 1978-05-30 1979-05-25 Monitoring device for monitoring telephone calls coming through a subscriber station
GB8003187A GB2037540B (en) 1978-05-30 1979-05-25 Monitoring device for monitoring telephone calls coming through a subscriber station
PCT/CH1979/000076 WO1979001145A1 (en) 1978-05-30 1979-05-25 Monitoring device for monitoring telephone calls coming through a subscriber station
SE8000586A SE420555B (sv) 1978-05-30 1980-01-25 Anordning for kontroll av till en abonnentapparat kommande telefonanrop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH587878A CH623695A5 (sv) 1978-05-30 1978-05-30

Publications (1)

Publication Number Publication Date
CH623695A5 true CH623695A5 (sv) 1981-06-15

Family

ID=4300837

Family Applications (1)

Application Number Title Priority Date Filing Date
CH587878A CH623695A5 (sv) 1978-05-30 1978-05-30

Country Status (5)

Country Link
CH (1) CH623695A5 (sv)
FR (1) FR2427748A1 (sv)
GB (1) GB2037540B (sv)
SE (1) SE420555B (sv)
WO (1) WO1979001145A1 (sv)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439638A (en) * 1982-01-28 1984-03-27 International Mobile Machines Corp. Sound-activated code-controlled detection system for telephones and the like
GB2203614A (en) * 1987-04-09 1988-10-19 British Broadcasting Corp Control of access to a telephone
GB2240903B (en) * 1990-02-13 1994-07-13 Proton Communications Automatic telephone call interceptor and interrogator devices

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829616A (en) * 1974-06-28 1974-08-13 Int Mobile Machines Ringer blocking attachment for telephones

Also Published As

Publication number Publication date
GB2037540A (en) 1980-07-09
SE8000586L (sv) 1980-01-25
SE420555B (sv) 1981-10-12
FR2427748A1 (fr) 1979-12-28
GB2037540B (en) 1982-08-18
WO1979001145A1 (en) 1979-12-27
FR2427748B1 (sv) 1982-06-11

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PL Patent ceased