JPS5511668A - Mischievous calling prevention system - Google Patents

Mischievous calling prevention system

Info

Publication number
JPS5511668A
JPS5511668A JP8479878A JP8479878A JPS5511668A JP S5511668 A JPS5511668 A JP S5511668A JP 8479878 A JP8479878 A JP 8479878A JP 8479878 A JP8479878 A JP 8479878A JP S5511668 A JPS5511668 A JP S5511668A
Authority
JP
Japan
Prior art keywords
secret number
mischievous
called subscriber
calling
ringing tone
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.)
Pending
Application number
JP8479878A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Takashima
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8479878A priority Critical patent/JPS5511668A/en
Publication of JPS5511668A publication Critical patent/JPS5511668A/en
Pending 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)

Abstract

PURPOSE:To protect the called subscriber from the mischievous calling by generating the ringing tone only when the person who knows the secret number of the called subscriber gives originating through switching given to the incoming state with the ringing signal from the station. CONSTITUTION:In the normal using state, change-over switch 2 is switched and connected to telephone 1. In the case of prevention for the mischievous calling, switch 2 is switched to incoming circuit 3 as well as to message transmission/reception part 6 for connection. When the bell ringing signal is put into circuit 3, the incoming state is secured and the message is transmitted from part 6. If the secret number given from the caller is correct, secret number reply part 4 operates to drive ringing tone generation part 5. Thus, the ringing tone is generated to call out the called subscriber. While in case no secret number arrives, the function of an automatic answering telephone set is obtained to record the contents of the massage.
JP8479878A 1978-07-11 1978-07-11 Mischievous calling prevention system Pending JPS5511668A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8479878A JPS5511668A (en) 1978-07-11 1978-07-11 Mischievous calling prevention system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8479878A JPS5511668A (en) 1978-07-11 1978-07-11 Mischievous calling prevention system

Publications (1)

Publication Number Publication Date
JPS5511668A true JPS5511668A (en) 1980-01-26

Family

ID=13840716

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8479878A Pending JPS5511668A (en) 1978-07-11 1978-07-11 Mischievous calling prevention system

Country Status (1)

Country Link
JP (1) JPS5511668A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01177246A (en) * 1988-01-05 1989-07-13 Sanyo Electric Co Ltd Caller selecting circuit for telephone system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01177246A (en) * 1988-01-05 1989-07-13 Sanyo Electric Co Ltd Caller selecting circuit for telephone system

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