JPS5511668A - Mischievous calling prevention system - Google Patents
Mischievous calling prevention systemInfo
- Publication number
- JPS5511668A JPS5511668A JP8479878A JP8479878A JPS5511668A JP S5511668 A JPS5511668 A JP S5511668A JP 8479878 A JP8479878 A JP 8479878A JP 8479878 A JP8479878 A JP 8479878A JP S5511668 A JPS5511668 A JP S5511668A
- Authority
- JP
- Japan
- Prior art keywords
- secret number
- mischievous
- called subscriber
- calling
- ringing tone
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
- H04M1/663—Preventing unauthorised calls to a telephone set
- H04M1/665—Preventing unauthorised calls to a telephone set by checking the validity of a code
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To protect the called subscriber from the mischievous calling by generating the ringing tone only when the person who knows the secret number of the called subscriber gives originating through switching given to the incoming state with the ringing signal from the station. CONSTITUTION:In the normal using state, change-over switch 2 is switched and connected to telephone 1. In the case of prevention for the mischievous calling, switch 2 is switched to incoming circuit 3 as well as to message transmission/reception part 6 for connection. When the bell ringing signal is put into circuit 3, the incoming state is secured and the message is transmitted from part 6. If the secret number given from the caller is correct, secret number reply part 4 operates to drive ringing tone generation part 5. Thus, the ringing tone is generated to call out the called subscriber. While in case no secret number arrives, the function of an automatic answering telephone set is obtained to record the contents of the massage.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8479878A JPS5511668A (en) | 1978-07-11 | 1978-07-11 | Mischievous calling prevention system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8479878A JPS5511668A (en) | 1978-07-11 | 1978-07-11 | Mischievous calling prevention system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5511668A true JPS5511668A (en) | 1980-01-26 |
Family
ID=13840716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8479878A Pending JPS5511668A (en) | 1978-07-11 | 1978-07-11 | Mischievous calling prevention system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5511668A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01177246A (en) * | 1988-01-05 | 1989-07-13 | Sanyo Electric Co Ltd | Caller selecting circuit for telephone system |
-
1978
- 1978-07-11 JP JP8479878A patent/JPS5511668A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01177246A (en) * | 1988-01-05 | 1989-07-13 | Sanyo Electric Co Ltd | Caller selecting circuit for telephone system |
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