JPS5437610A - Extension privacy service system - Google Patents

Extension privacy service system

Info

Publication number
JPS5437610A
JPS5437610A JP10455577A JP10455577A JPS5437610A JP S5437610 A JPS5437610 A JP S5437610A JP 10455577 A JP10455577 A JP 10455577A JP 10455577 A JP10455577 A JP 10455577A JP S5437610 A JPS5437610 A JP S5437610A
Authority
JP
Japan
Prior art keywords
extension
service system
privacy service
key telephone
telephone sets
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
JP10455577A
Other languages
Japanese (ja)
Other versions
JPS563705B2 (en
Inventor
Yoshiichi Sano
Takao Yamamoto
Taiji Sato
Shinichi Shibata
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP10455577A priority Critical patent/JPS5437610A/en
Publication of JPS5437610A publication Critical patent/JPS5437610A/en
Publication of JPS563705B2 publication Critical patent/JPS563705B2/ja
Granted 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
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To perform the extension privacy service and make it possible to release the interruption dependent upon the erroneous operation during the extension service by re-operation, by inhibiting the connection of another key telephone sets only in case that two or more key telephone sets are connected in the extension circuit.
JP10455577A 1977-08-31 1977-08-31 Extension privacy service system Granted JPS5437610A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10455577A JPS5437610A (en) 1977-08-31 1977-08-31 Extension privacy service system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10455577A JPS5437610A (en) 1977-08-31 1977-08-31 Extension privacy service system

Publications (2)

Publication Number Publication Date
JPS5437610A true JPS5437610A (en) 1979-03-20
JPS563705B2 JPS563705B2 (en) 1981-01-27

Family

ID=14383704

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10455577A Granted JPS5437610A (en) 1977-08-31 1977-08-31 Extension privacy service system

Country Status (1)

Country Link
JP (1) JPS5437610A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS495505A (en) * 1972-05-02 1974-01-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS495505A (en) * 1972-05-02 1974-01-18

Also Published As

Publication number Publication date
JPS563705B2 (en) 1981-01-27

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