JPS56117459A - Telephone device - Google Patents
Telephone deviceInfo
- Publication number
- JPS56117459A JPS56117459A JP2213180A JP2213180A JPS56117459A JP S56117459 A JPS56117459 A JP S56117459A JP 2213180 A JP2213180 A JP 2213180A JP 2213180 A JP2213180 A JP 2213180A JP S56117459 A JPS56117459 A JP S56117459A
- Authority
- JP
- Japan
- Prior art keywords
- telephone number
- sent
- calling subscriber
- receiver side
- answer
- 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 give an answer only to the calling subscriber that the receiver side expects, by sending the telephone number or the recognition number of the calling subscriber to the receiver side through the trunk line and giving an answer only to the calling subscriber that the receiver side has decided previously. CONSTITUTION:The telephone number of a calling subscriber that is sent to the receiver side through the trunk line 1 is detected at the telephone number detecting part 5 and then taken into the telephone number memory part 8. The telephone number stored temporarily in the part 8 is sent to the telephone number display part 7 for display and at the same time sent to the telephone number comparing part 11. On the other hand, the reserved telephone number, which is stored in the reserved telephone number memory part 10 via the reserved telephone number input part 9 in order to give an answer only to the calling subscriber that the receiver side expects is sent to the other side of the part 11. After confirmation of a coincidence between the telephone numbers, the confirmation signal is sent to the control part 12. Then the switch 13 that gives a short circuit across the ringer sound volume adjuster 3 is opened to increase the sound volume of ringer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2213180A JPS56117459A (en) | 1980-02-22 | 1980-02-22 | Telephone device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2213180A JPS56117459A (en) | 1980-02-22 | 1980-02-22 | Telephone device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56117459A true JPS56117459A (en) | 1981-09-14 |
Family
ID=12074326
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2213180A Pending JPS56117459A (en) | 1980-02-22 | 1980-02-22 | Telephone device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56117459A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5265145A (en) * | 1991-03-28 | 1993-11-23 | Lim Boon C | Alphanumeric caller identification telephone |
-
1980
- 1980-02-22 JP JP2213180A patent/JPS56117459A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5265145A (en) * | 1991-03-28 | 1993-11-23 | Lim Boon C | Alphanumeric caller identification telephone |
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