JPS55150648A - Called subscriber calling system in automatic telephone exchange - Google Patents

Called subscriber calling system in automatic telephone exchange

Info

Publication number
JPS55150648A
JPS55150648A JP5956079A JP5956079A JPS55150648A JP S55150648 A JPS55150648 A JP S55150648A JP 5956079 A JP5956079 A JP 5956079A JP 5956079 A JP5956079 A JP 5956079A JP S55150648 A JPS55150648 A JP S55150648A
Authority
JP
Japan
Prior art keywords
subscriber
control unit
memory unit
busy tone
detected
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
JP5956079A
Other languages
Japanese (ja)
Inventor
Yasuharu Moriya
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 JP5956079A priority Critical patent/JPS55150648A/en
Publication of JPS55150648A publication Critical patent/JPS55150648A/en
Pending 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
    • H04M3/424—Arrangements for automatic redialling

Landscapes

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

Abstract

PURPOSE:To omit the trouble of dial operations of a calling subscriber, by releasing the line when busy tone is detected and by starting again to transmit a number on the basis of contents of the memory unit and repeat call. CONSTITUTION:When calling subscriber 1 hooks off the telephone receiver, subscriber's circuit 2 detects start, and dial tone is returned to calling subscriber 1. Meanwhile, subscriber's circuit 2 sends start information to control unit 4, and exchange 6 not only relays the continuous dial number of calling subscriber 1 but also stores it in memory unit 5 temporarily. If busy tone is detected by busy tone detector 3, this information is transmitted to control unit 4 to release the line. After completing release, control unit 4 starts exchange 6 to read out the called subscriber number in memory unit 5 and transmits the number to wait for answer. However, if busy tone is detected, the same operation is repeated. When called subscriber 7 answers, the serivice state is set, and control unit 4, memory unit 5, and so on are released.
JP5956079A 1979-05-15 1979-05-15 Called subscriber calling system in automatic telephone exchange Pending JPS55150648A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5956079A JPS55150648A (en) 1979-05-15 1979-05-15 Called subscriber calling system in automatic telephone exchange

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5956079A JPS55150648A (en) 1979-05-15 1979-05-15 Called subscriber calling system in automatic telephone exchange

Publications (1)

Publication Number Publication Date
JPS55150648A true JPS55150648A (en) 1980-11-22

Family

ID=13116747

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5956079A Pending JPS55150648A (en) 1979-05-15 1979-05-15 Called subscriber calling system in automatic telephone exchange

Country Status (1)

Country Link
JP (1) JPS55150648A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62168452A (en) * 1986-01-20 1987-07-24 Nec Corp Automatic dial calling system
JPH04230198A (en) * 1990-12-27 1992-08-19 Daini Denden Kk Help service system in busy absence state at tele-point

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62168452A (en) * 1986-01-20 1987-07-24 Nec Corp Automatic dial calling system
JPH04230198A (en) * 1990-12-27 1992-08-19 Daini Denden Kk Help service system in busy absence state at tele-point

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