JPS5456307A - Call waiting system - Google Patents

Call waiting system

Info

Publication number
JPS5456307A
JPS5456307A JP12239277A JP12239277A JPS5456307A JP S5456307 A JPS5456307 A JP S5456307A JP 12239277 A JP12239277 A JP 12239277A JP 12239277 A JP12239277 A JP 12239277A JP S5456307 A JPS5456307 A JP S5456307A
Authority
JP
Japan
Prior art keywords
suba
incoming
transmitted
call waiting
subc
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
JP12239277A
Other languages
Japanese (ja)
Other versions
JPS588789B2 (en
Inventor
Shogo Shibano
Shinichi Suzuki
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
Nippon Telegraph and Telephone Corp
Original Assignee
Hitachi Ltd
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 Hitachi Ltd, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP12239277A priority Critical patent/JPS588789B2/en
Publication of JPS5456307A publication Critical patent/JPS5456307A/en
Publication of JPS588789B2 publication Critical patent/JPS588789B2/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/42Systems providing special services or facilities to subscribers

Landscapes

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

Abstract

PURPOSE:To improve the quality of the call waiting service in an extermely economical way as well as to eliminate the anxiety between the subscribers, by opening the caller different from the normal state until the free line answer signal is transmitted and the subscriber gives the hooking operation. CONSTITUTION:When an incoming is given from subscriber SUBC which is the third party, subscriber SUBA and B are connected to call waiting device CWE via call waiting switch SWU and incoming link CWL. With actuation of relay A connected to SUBA, contact (a) is closed to transmit incoming display tone CRBT to SUBA from the third winding of relay A. At the same time, the free line answer signal is sent back via the loop of coil RETO and diode D to stop the ringing tone which is transmitted from incoming trunk ICT, and special ringing tone SPRBT is transmitted from RETO via the loop of RETO-capacitor C2. If SUBA knows the incoming of SUBC through CRBT and gives the hooking operation for answering, the answer is charged. But in case the hooking operation is impossible, the special ringing tone is transmitted incessantly. Thus, SUBC can know that no answer is given from SUBA.
JP12239277A 1977-10-14 1977-10-14 Call waiting method Expired JPS588789B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12239277A JPS588789B2 (en) 1977-10-14 1977-10-14 Call waiting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12239277A JPS588789B2 (en) 1977-10-14 1977-10-14 Call waiting method

Publications (2)

Publication Number Publication Date
JPS5456307A true JPS5456307A (en) 1979-05-07
JPS588789B2 JPS588789B2 (en) 1983-02-17

Family

ID=14834651

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12239277A Expired JPS588789B2 (en) 1977-10-14 1977-10-14 Call waiting method

Country Status (1)

Country Link
JP (1) JPS588789B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0556156A (en) * 1991-08-23 1993-03-05 Oki Electric Ind Co Ltd Subscriber line spare time use system and calling subscriber notice device used for the system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0556156A (en) * 1991-08-23 1993-03-05 Oki Electric Ind Co Ltd Subscriber line spare time use system and calling subscriber notice device used for the system

Also Published As

Publication number Publication date
JPS588789B2 (en) 1983-02-17

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