JPS53128207A - Call tracing system for telephone - Google Patents

Call tracing system for telephone

Info

Publication number
JPS53128207A
JPS53128207A JP4206477A JP4206477A JPS53128207A JP S53128207 A JPS53128207 A JP S53128207A JP 4206477 A JP4206477 A JP 4206477A JP 4206477 A JP4206477 A JP 4206477A JP S53128207 A JPS53128207 A JP S53128207A
Authority
JP
Japan
Prior art keywords
telephone
tracing system
call tracing
transmission station
call
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
JP4206477A
Other languages
Japanese (ja)
Other versions
JPS5741869B2 (en
Inventor
Shinji Yamamoto
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP4206477A priority Critical patent/JPS53128207A/en
Publication of JPS53128207A publication Critical patent/JPS53128207A/en
Publication of JPS5741869B2 publication Critical patent/JPS5741869B2/ja
Granted 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

Landscapes

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

Abstract

PURPOSE:To secure a detection of the caller at the crossbar transmission station at the dial end time, by giving perforation to the trouble recorder with use of the regulation earth discriminating device of the transmission station.
JP4206477A 1977-04-14 1977-04-14 Call tracing system for telephone Granted JPS53128207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4206477A JPS53128207A (en) 1977-04-14 1977-04-14 Call tracing system for telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4206477A JPS53128207A (en) 1977-04-14 1977-04-14 Call tracing system for telephone

Publications (2)

Publication Number Publication Date
JPS53128207A true JPS53128207A (en) 1978-11-09
JPS5741869B2 JPS5741869B2 (en) 1982-09-06

Family

ID=12625660

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4206477A Granted JPS53128207A (en) 1977-04-14 1977-04-14 Call tracing system for telephone

Country Status (1)

Country Link
JP (1) JPS53128207A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5825752A (en) * 1981-08-07 1983-02-16 Kazutoshi Nakao Detecting device for telephone number calling to specific telephone number
JPS60171852A (en) * 1984-02-15 1985-09-05 Fujitsu Ltd Malicious call detecting system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0121689Y2 (en) * 1985-01-24 1989-06-28
JPH0535968Y2 (en) * 1986-01-25 1993-09-10

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5825752A (en) * 1981-08-07 1983-02-16 Kazutoshi Nakao Detecting device for telephone number calling to specific telephone number
JPS60171852A (en) * 1984-02-15 1985-09-05 Fujitsu Ltd Malicious call detecting system

Also Published As

Publication number Publication date
JPS5741869B2 (en) 1982-09-06

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