JPS5272506A - Prevention of erroneous incoming call - Google Patents

Prevention of erroneous incoming call

Info

Publication number
JPS5272506A
JPS5272506A JP14838875A JP14838875A JPS5272506A JP S5272506 A JPS5272506 A JP S5272506A JP 14838875 A JP14838875 A JP 14838875A JP 14838875 A JP14838875 A JP 14838875A JP S5272506 A JPS5272506 A JP S5272506A
Authority
JP
Japan
Prior art keywords
incoming call
prevention
erroneous incoming
erroneous
called
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
JP14838875A
Other languages
Japanese (ja)
Inventor
Makoto Hisamura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14838875A priority Critical patent/JPS5272506A/en
Publication of JPS5272506A publication Critical patent/JPS5272506A/en
Pending 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
    • H04M3/50—Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers ; Centralised arrangements for recording messages

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:A free-of-charge response trunk is inserted between the calling unit of the telephone exchange and the subscriber's telephone, and it is so arranged that the called party is called only after talkie is sent to the calling party for a certain period of time in order to enable him to verify the called party, so that the erroneous incoming call can be prevented.
JP14838875A 1975-12-15 1975-12-15 Prevention of erroneous incoming call Pending JPS5272506A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14838875A JPS5272506A (en) 1975-12-15 1975-12-15 Prevention of erroneous incoming call

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14838875A JPS5272506A (en) 1975-12-15 1975-12-15 Prevention of erroneous incoming call

Publications (1)

Publication Number Publication Date
JPS5272506A true JPS5272506A (en) 1977-06-17

Family

ID=15451644

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14838875A Pending JPS5272506A (en) 1975-12-15 1975-12-15 Prevention of erroneous incoming call

Country Status (1)

Country Link
JP (1) JPS5272506A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6268356A (en) * 1985-09-20 1987-03-28 Hitachi Ltd Input confirming system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6268356A (en) * 1985-09-20 1987-03-28 Hitachi Ltd Input confirming system

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