JPS5478603A - Telephone circuit - Google Patents

Telephone circuit

Info

Publication number
JPS5478603A
JPS5478603A JP14580077A JP14580077A JPS5478603A JP S5478603 A JPS5478603 A JP S5478603A JP 14580077 A JP14580077 A JP 14580077A JP 14580077 A JP14580077 A JP 14580077A JP S5478603 A JPS5478603 A JP S5478603A
Authority
JP
Japan
Prior art keywords
circuit
relay
originating
called subscriber
exchange
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
JP14580077A
Other languages
Japanese (ja)
Other versions
JPS5622178B2 (en
Inventor
Yoshio Fujishita
Satoshi Iizuka
Kazuo Saito
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.)
NTT Inc
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 JP14580077A priority Critical patent/JPS5478603A/en
Publication of JPS5478603A publication Critical patent/JPS5478603A/en
Publication of JPS5622178B2 publication Critical patent/JPS5622178B2/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
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Landscapes

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

Abstract

PURPOSE:To prevent the effect of the service interruption as well as the collision between the originating and incoming calls by making talking circuit correspond to the state of the exchange before answering to the called subscriber to use it as the incoming circuit for the public telephone. CONSTITUTION:At the incoming time, terminal L10 and L9 are inverted to + and - polarites respectively. And relay RR is actuated to ring bell BB. When the caller resigns halfway, relay RR is released. With confirmation of the answer of the called subscriber through the exchange, terminal L9 and L10 are turned to + and - polarities respectively. Relay RR keeps actuation, and bell BB stops ringing. When the call is over via talking SC1 and the called subscriber is hooked on, relay RR is released and then the originating call control is carried out through originating call control circuit CC2. In this case, the operation of RR is made to correspond to the function of the exchange under on-hook state uniformly. And at the off-hook time, the switching is over between the terminating circuit and the originating circuit.
JP14580077A 1977-12-05 1977-12-05 Telephone circuit Granted JPS5478603A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14580077A JPS5478603A (en) 1977-12-05 1977-12-05 Telephone circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14580077A JPS5478603A (en) 1977-12-05 1977-12-05 Telephone circuit

Publications (2)

Publication Number Publication Date
JPS5478603A true JPS5478603A (en) 1979-06-22
JPS5622178B2 JPS5622178B2 (en) 1981-05-23

Family

ID=15393434

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14580077A Granted JPS5478603A (en) 1977-12-05 1977-12-05 Telephone circuit

Country Status (1)

Country Link
JP (1) JPS5478603A (en)

Also Published As

Publication number Publication date
JPS5622178B2 (en) 1981-05-23

Similar Documents

Publication Publication Date Title
CA2235492A1 (en) Method for monitoring voicemail calls using adsi capable cpe
CA2123348A1 (en) Telecommunications System Sequence Calling
KR980007298A (en) Automatic dialing method of exchange system
CA1048185A (en) Two-party telephone system
JPS5399802A (en) Specific subscriber calling equipment of automatic answering telephone set
GB635644A (en) Improvements relating to telephone systems
GB1099697A (en) Improvements in or relating to private branch exchange telephone switching systems
JPS6242538B2 (en)
JPS5624896A (en) Multipartite telephone set calling system
JPS57131158A (en) Automatic answering telephone set
JPS5630352A (en) Subscriber's terminal equipment
JPS5563162A (en) Subscriber line call signal transmission system
KR100299042B1 (en) Call transfer method through analog e&m networking in private exchange
JPH0247967A (en) Private branch exchange ring ringer
JPS6187459A (en) Absence notification system of electronic exchange
JPS5511668A (en) Mischievous calling prevention system
JPS5689162A (en) Number change guide system
JPS59154864A (en) Absence calling connection processing system
JPS6441551A (en) Private line forces cut-off system
JPS56128060A (en) Calling device
JPS577660A (en) Connection system for link circuit
JPS54102912A (en) Mutual call signal system for reverting subscribers
GB724852A (en) Improvements in or relating to party line telephone systems
GB969537A (en) Improvements in and relating to telephone systems
JPS5461811A (en) Continuous registration system on abbreviated dialing service