JPS5456307A - Call waiting system - Google Patents
Call waiting systemInfo
- 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
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
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.
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)
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 |
-
1977
- 1977-10-14 JP JP12239277A patent/JPS588789B2/en not_active Expired
Cited By (1)
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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