FR2427748B1 - - Google Patents

Info

Publication number
FR2427748B1
FR2427748B1 FR7822913A FR7822913A FR2427748B1 FR 2427748 B1 FR2427748 B1 FR 2427748B1 FR 7822913 A FR7822913 A FR 7822913A FR 7822913 A FR7822913 A FR 7822913A FR 2427748 B1 FR2427748 B1 FR 2427748B1
Authority
FR
France
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.)
Expired
Application number
FR7822913A
Other versions
FR2427748A1 (fr
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
Publication of FR2427748A1 publication Critical patent/FR2427748A1/fr
Application granted granted Critical
Publication of FR2427748B1 publication Critical patent/FR2427748B1/fr
Granted 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
    • H04M1/663—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)
  • Devices For Supply Of Signal Current (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Alarm Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
FR7822913A 1978-05-30 1978-07-28 Dispositif de controle des appels telephoniques arrivant a une station d'abonne Granted FR2427748A1 (fr)

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
FR2427748A1 FR2427748A1 (fr) 1979-12-28
FR2427748B1 true FR2427748B1 (fr) 1982-06-11

Family

ID=4300837

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7822913A Granted FR2427748A1 (fr) 1978-05-30 1978-07-28 Dispositif de controle des appels telephoniques arrivant a une station d'abonne

Country Status (5)

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

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
FR2427748A1 (fr) 1979-12-28
SE420555B (sv) 1981-10-12
WO1979001145A1 (fr) 1979-12-27
CH623695A5 (fr) 1981-06-15
SE8000586L (sv) 1980-01-25
GB2037540A (en) 1980-07-09
GB2037540B (en) 1982-08-18

Similar Documents

Publication Publication Date Title
FR2414078B1 (fr)
FR2414189B1 (fr)
DE2954373A1 (fr)
DE2918125C2 (fr)
FR2413346B3 (fr)
DE2949975C2 (fr)
DE2817041C2 (fr)
DE2916913C2 (fr)
CH645769GA3 (fr)
FR2414677B1 (fr)
DE2928857C3 (fr)
DE2828689C2 (fr)
FR2382443B1 (fr)
AU3898778A (fr)
AU3803078A (fr)
FR2380846B1 (fr)
DK141641C (fr)
AU73950S (fr)
AU3892778A (fr)
BG26014A1 (fr)
BG25957A1 (fr)
BG26735A1 (fr)
BG26022A1 (fr)
BG26017A1 (fr)
BG27150A1 (fr)

Legal Events

Date Code Title Description
ST Notification of lapse