[go: up one dir, main page]

JPS57131157A - Absence pretending telephone set - Google Patents

Absence pretending telephone set

Info

Publication number
JPS57131157A
JPS57131157A JP1644681A JP1644681A JPS57131157A JP S57131157 A JPS57131157 A JP S57131157A JP 1644681 A JP1644681 A JP 1644681A JP 1644681 A JP1644681 A JP 1644681A JP S57131157 A JPS57131157 A JP S57131157A
Authority
JP
Japan
Prior art keywords
telephone set
circuit
absence
telephone
switched
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
JP1644681A
Other languages
Japanese (ja)
Inventor
Atsutake Sanagi
Hiroshi Tominaga
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 JP1644681A priority Critical patent/JPS57131157A/en
Publication of JPS57131157A publication Critical patent/JPS57131157A/en
Pending 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
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/663—Preventing unauthorised calls to a telephone set
    • H04M1/665—Preventing unauthorised calls to a telephone set by checking the validity of a code

Landscapes

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

Abstract

PURPOSE:To execute an answer of absence in case of regular incoming, and after that, to display incoming only in case when a specific number has been transmitted by means of a push-button. CONSTITUTION:When a telephone set 2 is in an on-hook state, a changeover switched to the lower side. When there is a call from a telephone line 1 in this state, it is detected by a ringing tone detecting circuit 4, a sequence controlling circuit 9 forms a call state to a calling party by operating an off-hooking circuit 5, and sends out a message of absence from a message sending-out circuit 6. After that, when the calling party sends out a special number by operating a push-button of the telephone set, it is received by a push-button signal receiving circuit 7, and when it coincides with a number decided in advance, telephone incoming is informed to a called party by ringing a call bell 8. When the called party takes up a transmitter and receiver of the telephone set 2, the changeover switched is switched, and the telephone line 1 is connected to the telephone set 2.
JP1644681A 1981-02-06 1981-02-06 Absence pretending telephone set Pending JPS57131157A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1644681A JPS57131157A (en) 1981-02-06 1981-02-06 Absence pretending telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1644681A JPS57131157A (en) 1981-02-06 1981-02-06 Absence pretending telephone set

Publications (1)

Publication Number Publication Date
JPS57131157A true JPS57131157A (en) 1982-08-13

Family

ID=11916459

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1644681A Pending JPS57131157A (en) 1981-02-06 1981-02-06 Absence pretending telephone set

Country Status (1)

Country Link
JP (1) JPS57131157A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61120556A (en) * 1984-11-15 1986-06-07 Nippon Telegr & Teleph Corp <Ntt> answering machine
JPS6237475U (en) * 1985-04-19 1987-03-05
JPS63197153A (en) * 1987-02-10 1988-08-16 Sanyo Electric Co Ltd Caller selection circuit for telephone set

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61120556A (en) * 1984-11-15 1986-06-07 Nippon Telegr & Teleph Corp <Ntt> answering machine
JPH0369468B2 (en) * 1984-11-15 1991-11-01 Nippon Denshin Denwa Kk
JPS6237475U (en) * 1985-04-19 1987-03-05
JPS63197153A (en) * 1987-02-10 1988-08-16 Sanyo Electric Co Ltd Caller selection circuit for telephone set

Similar Documents

Publication Publication Date Title
CA2006140A1 (en) Communication device connected to telephone line together with telephone set
US4059732A (en) Centralized telephone answering apparatus with remote accessing
SE9601364L (en) Device and method for generating ring-voice message in automatic answering machine
JPS57131157A (en) Absence pretending telephone set
JPS56117467A (en) Automatic outgoing device
JPS5664524A (en) Telephone installed on travelling object
JPS6235758A (en) Data communication equipment
JPS5715567A (en) Facsimile system
JPS5690670A (en) Communication system
JPS644160A (en) Facsimile equipment
JPS57131158A (en) Automatic answering telephone set
JPS57174969A (en) Busy incoming system
JPS6425642A (en) Telephone set with response control function
JPS5671366A (en) Telephone set having communication time elapsed alarm function
JPS5758452A (en) Button telephone device
JPS5577271A (en) Switching system between data signal and sound signal of digital circuit
JPS5563162A (en) Subscriber line call signal transmission system
KR200301283Y1 (en) Ring / down unit with loop detection
JPS57131156A (en) Automatic answering telephone set
JP2651694B2 (en) Automatic telephone line switching device
JPS5511668A (en) Mischievous calling prevention system
JPS6424669A (en) Dp/pb switching system in on-line composite terminal equipment
JPS56123138A (en) Cordless telephone set
JPS54100608A (en) Circuit control system of time-division digital telephone switchboard
JPS62183650A (en) Telephone equipment