JPS56117459A - Telephone device - Google Patents

Telephone device

Info

Publication number
JPS56117459A
JPS56117459A JP2213180A JP2213180A JPS56117459A JP S56117459 A JPS56117459 A JP S56117459A JP 2213180 A JP2213180 A JP 2213180A JP 2213180 A JP2213180 A JP 2213180A JP S56117459 A JPS56117459 A JP S56117459A
Authority
JP
Japan
Prior art keywords
telephone number
sent
calling subscriber
receiver side
answer
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
JP2213180A
Other languages
Japanese (ja)
Inventor
Makoto Urabe
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2213180A priority Critical patent/JPS56117459A/en
Publication of JPS56117459A publication Critical patent/JPS56117459A/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 give an answer only to the calling subscriber that the receiver side expects, by sending the telephone number or the recognition number of the calling subscriber to the receiver side through the trunk line and giving an answer only to the calling subscriber that the receiver side has decided previously. CONSTITUTION:The telephone number of a calling subscriber that is sent to the receiver side through the trunk line 1 is detected at the telephone number detecting part 5 and then taken into the telephone number memory part 8. The telephone number stored temporarily in the part 8 is sent to the telephone number display part 7 for display and at the same time sent to the telephone number comparing part 11. On the other hand, the reserved telephone number, which is stored in the reserved telephone number memory part 10 via the reserved telephone number input part 9 in order to give an answer only to the calling subscriber that the receiver side expects is sent to the other side of the part 11. After confirmation of a coincidence between the telephone numbers, the confirmation signal is sent to the control part 12. Then the switch 13 that gives a short circuit across the ringer sound volume adjuster 3 is opened to increase the sound volume of ringer.
JP2213180A 1980-02-22 1980-02-22 Telephone device Pending JPS56117459A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2213180A JPS56117459A (en) 1980-02-22 1980-02-22 Telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2213180A JPS56117459A (en) 1980-02-22 1980-02-22 Telephone device

Publications (1)

Publication Number Publication Date
JPS56117459A true JPS56117459A (en) 1981-09-14

Family

ID=12074326

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2213180A Pending JPS56117459A (en) 1980-02-22 1980-02-22 Telephone device

Country Status (1)

Country Link
JP (1) JPS56117459A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5265145A (en) * 1991-03-28 1993-11-23 Lim Boon C Alphanumeric caller identification telephone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5265145A (en) * 1991-03-28 1993-11-23 Lim Boon C Alphanumeric caller identification telephone

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