JPS54134911A - Calling system for opposite straight circuit - Google Patents

Calling system for opposite straight circuit

Info

Publication number
JPS54134911A
JPS54134911A JP4211178A JP4211178A JPS54134911A JP S54134911 A JPS54134911 A JP S54134911A JP 4211178 A JP4211178 A JP 4211178A JP 4211178 A JP4211178 A JP 4211178A JP S54134911 A JPS54134911 A JP S54134911A
Authority
JP
Japan
Prior art keywords
extension
call
drct
opposite direct
direct trunk
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
JP4211178A
Other languages
Japanese (ja)
Inventor
Yasuhiro Kondo
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4211178A priority Critical patent/JPS54134911A/en
Publication of JPS54134911A publication Critical patent/JPS54134911A/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
    • H04M3/54—Arrangements for diverting calls for one subscriber to another predetermined subscriber

Landscapes

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

Abstract

PURPOSE:To improve the service by making a call to one called extension from an opposite direct trunk and by making a call to another called extension when the called extension gives no answer for a certain time. CONSTITUTION:A lift of the handset of calling extension EXT1 is detected by opposite direct trunk DRCT and a call to prescribed EXT2 is made by opposite direct trunk DRCT. If extension EXT2 gives no answer, opposite direct trunk DRCT detects it and makes a call to another extension EXT3. Consequently, the service can be improved.
JP4211178A 1978-04-12 1978-04-12 Calling system for opposite straight circuit Pending JPS54134911A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4211178A JPS54134911A (en) 1978-04-12 1978-04-12 Calling system for opposite straight circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4211178A JPS54134911A (en) 1978-04-12 1978-04-12 Calling system for opposite straight circuit

Publications (1)

Publication Number Publication Date
JPS54134911A true JPS54134911A (en) 1979-10-19

Family

ID=12626836

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4211178A Pending JPS54134911A (en) 1978-04-12 1978-04-12 Calling system for opposite straight circuit

Country Status (1)

Country Link
JP (1) JPS54134911A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56132050A (en) * 1980-03-19 1981-10-16 Hitachi Denshi Ltd Absence transfer system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56132050A (en) * 1980-03-19 1981-10-16 Hitachi Denshi Ltd Absence transfer system

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