JPS54152906A - Specific-number telephone system - Google Patents

Specific-number telephone system

Info

Publication number
JPS54152906A
JPS54152906A JP6264778A JP6264778A JPS54152906A JP S54152906 A JPS54152906 A JP S54152906A JP 6264778 A JP6264778 A JP 6264778A JP 6264778 A JP6264778 A JP 6264778A JP S54152906 A JPS54152906 A JP S54152906A
Authority
JP
Japan
Prior art keywords
telephone set
circuit
specific number
telephone
audio
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.)
Granted
Application number
JP6264778A
Other languages
Japanese (ja)
Other versions
JPS6046909B2 (en
Inventor
Teruo Itakura
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 JP53062647A priority Critical patent/JPS6046909B2/en
Publication of JPS54152906A publication Critical patent/JPS54152906A/en
Publication of JPS6046909B2 publication Critical patent/JPS6046909B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/436—Arrangements for screening incoming calls, i.e. evaluating the characteristics of a call before deciding whether to answer it

Abstract

PURPOSE:To make it possible to receive only telephone calls from many and specified persons by limiting the incoming of random telephone calls from many and unspecified persons, by providing a circuit, which detects a specific number, between the subscriber's terminal of a switchboard and a telephone set. CONSTITUTION:Between telephone set 6 and switchboard 4 where called telephone set 6 requiring to avoid random telephone calls from many and unspecified persons belongs, additional unit 5 is provided, which is equipped with a receiving method such as multifrequency receiver circuit 9 connected to connection circuit 14 receiving an audio-frequency signal from telephone set 1, and collating circuit 11 which collates a number, equivalent to the audio-frequency signal stored in receiving memory circuit 10, with the specific number of called telephone set 6 offered services. Then, a connection between calling telephone 3 and the specific number of the audio- frequency signal is sent out from calling telephone set 1 and collated with the specific number by additional unit 5, so that when the both agree each other, the bell of called telephone set 1 will be actuated.
JP53062647A 1978-05-24 1978-05-24 Specific number telephone system Expired JPS6046909B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53062647A JPS6046909B2 (en) 1978-05-24 1978-05-24 Specific number telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53062647A JPS6046909B2 (en) 1978-05-24 1978-05-24 Specific number telephone system

Publications (2)

Publication Number Publication Date
JPS54152906A true JPS54152906A (en) 1979-12-01
JPS6046909B2 JPS6046909B2 (en) 1985-10-18

Family

ID=13206323

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53062647A Expired JPS6046909B2 (en) 1978-05-24 1978-05-24 Specific number telephone system

Country Status (1)

Country Link
JP (1) JPS6046909B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6077221A (en) * 1983-10-03 1985-05-01 Nec Corp Data input device
JPS63108895A (en) * 1986-10-25 1988-05-13 Meisei Electric Co Ltd Dial-in service system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936617A (en) * 1974-08-12 1976-02-03 International Mobile Machines Corporation Code-controlled ringer attachment for telephones

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936617A (en) * 1974-08-12 1976-02-03 International Mobile Machines Corporation Code-controlled ringer attachment for telephones

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6077221A (en) * 1983-10-03 1985-05-01 Nec Corp Data input device
JPS63108895A (en) * 1986-10-25 1988-05-13 Meisei Electric Co Ltd Dial-in service system

Also Published As

Publication number Publication date
JPS6046909B2 (en) 1985-10-18

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