JPS5436108A - Malicious call detection system - Google Patents

Malicious call detection system

Info

Publication number
JPS5436108A
JPS5436108A JP10296177A JP10296177A JPS5436108A JP S5436108 A JPS5436108 A JP S5436108A JP 10296177 A JP10296177 A JP 10296177A JP 10296177 A JP10296177 A JP 10296177A JP S5436108 A JPS5436108 A JP S5436108A
Authority
JP
Japan
Prior art keywords
detection system
malicious call
call detection
key
malicious
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
JP10296177A
Other languages
Japanese (ja)
Inventor
Shuhei Sakakibara
Seiichi Inoue
Shuji Oka
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 JP10296177A priority Critical patent/JPS5436108A/en
Publication of JPS5436108A publication Critical patent/JPS5436108A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M5/00—Manual exchanges
    • H04M5/18—Arrangements for signalling the class or number of called or calling line from one exchange to another
    • H04M5/20—Arrangements for indicating the numbers of the incoming lines

Landscapes

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

Abstract

PURPOSE:To easily detect the malicious call subscriber, by enabling to receive the signal from the telephone set providing the key and the key in trunks.
JP10296177A 1977-08-26 1977-08-26 Malicious call detection system Pending JPS5436108A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10296177A JPS5436108A (en) 1977-08-26 1977-08-26 Malicious call detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10296177A JPS5436108A (en) 1977-08-26 1977-08-26 Malicious call detection system

Publications (1)

Publication Number Publication Date
JPS5436108A true JPS5436108A (en) 1979-03-16

Family

ID=14341377

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10296177A Pending JPS5436108A (en) 1977-08-26 1977-08-26 Malicious call detection system

Country Status (1)

Country Link
JP (1) JPS5436108A (en)

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