SE8000586L - DEVICE FOR CONTROL OF A SUBSCRIBER DEVICE COMMANDING PHONE CALL - Google Patents

DEVICE FOR CONTROL OF A SUBSCRIBER DEVICE COMMANDING PHONE CALL

Info

Publication number
SE8000586L
SE8000586L SE8000586A SE8000586A SE8000586L SE 8000586 L SE8000586 L SE 8000586L SE 8000586 A SE8000586 A SE 8000586A SE 8000586 A SE8000586 A SE 8000586A SE 8000586 L SE8000586 L SE 8000586L
Authority
SE
Sweden
Prior art keywords
subscriber
control
station
phone call
commanding
Prior art date
Application number
SE8000586A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE420555B (en
Original Assignee
Toledo Pierre De
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 Toledo Pierre De filed Critical Toledo Pierre De
Publication of SE8000586L publication Critical patent/SE8000586L/en
Publication of SE420555B publication Critical patent/SE420555B/en

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

Abstract

The object of the device is to monitor telephone calls coming through a subscriber station before they are transmitted to this station. It comprises switching means (RL1, RL2, RL3) aimed at being connected to the subscriber line, reception and detection means (RF1, RF3, RF5) of a coded sound frequency signal transmitted by the subscriber line and control means for controlling the switching means, associated to the detection means altogether assembled so as to connect the subcriber line to the station after reception and detection of the coded signals. The device is aimed at being connected on any subscriber station.
SE8000586A 1978-05-30 1980-01-25 DEVICE FOR CONTROL OF A SUBSCRIBER DEVICE COMMANDING PHONE CALL SE420555B (en)

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
SE8000586L true SE8000586L (en) 1980-01-25
SE420555B SE420555B (en) 1981-10-12

Family

ID=4300837

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8000586A SE420555B (en) 1978-05-30 1980-01-25 DEVICE FOR CONTROL OF A SUBSCRIBER DEVICE COMMANDING PHONE CALL

Country Status (5)

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

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 (en) 1979-12-28
CH623695A5 (en) 1981-06-15
SE420555B (en) 1981-10-12
GB2037540A (en) 1980-07-09
GB2037540B (en) 1982-08-18
WO1979001145A1 (en) 1979-12-27
FR2427748B1 (en) 1982-06-11

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