JPH0461956U - - Google Patents

Info

Publication number
JPH0461956U
JPH0461956U JP10540590U JP10540590U JPH0461956U JP H0461956 U JPH0461956 U JP H0461956U JP 10540590 U JP10540590 U JP 10540590U JP 10540590 U JP10540590 U JP 10540590U JP H0461956 U JPH0461956 U JP H0461956U
Authority
JP
Japan
Prior art keywords
secret number
corresponding predetermined
predetermined secret
call
adds
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
JP10540590U
Other languages
Japanese (ja)
Other versions
JP2530877Y2 (en
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 filed Critical
Priority to JP10540590U priority Critical patent/JP2530877Y2/en
Publication of JPH0461956U publication Critical patent/JPH0461956U/ja
Application granted granted Critical
Publication of JP2530877Y2 publication Critical patent/JP2530877Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Prepayment Telephone Systems (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の一実施例を説明するための図
である。 １……公衆電話機、２……秘密番号送出部、３
……一般電話機、４……交換機、５……秘密番号
識別部、６……公衆電話回線。 FIG. 1 is a diagram for explaining one embodiment of the present invention. 1...Public phone, 2...Secret number sending unit, 3
... general telephone, 4 ... exchange, 5 ... secret number identification section, 6 ... public telephone line.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 公衆電話機に設けられ、発信時に送出される着
信番号に所定の秘密番号を付加し送出する秘密番
号送出部と、交換機に設けられ、前記秘密番号送
出部から前記秘密番号を受信し前記公衆電話機に
対応する所定の秘密番号であるか否かを識別する
秘密番号識別部とを備えたことを特徴とする無料
発信防止システム。 A secret number sending unit provided in a public telephone set, which adds a predetermined secret number to a called number sent out when making a call, and transmitting the same; 1. A free call prevention system, comprising: a secret number identification unit that identifies whether or not the corresponding predetermined secret number is a corresponding predetermined secret number.
JP10540590U 1990-10-05 1990-10-05 Free call prevention system Expired - Lifetime JP2530877Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10540590U JP2530877Y2 (en) 1990-10-05 1990-10-05 Free call prevention system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10540590U JP2530877Y2 (en) 1990-10-05 1990-10-05 Free call prevention system

Publications (2)

Publication Number Publication Date
JPH0461956U true JPH0461956U (en) 1992-05-27
JP2530877Y2 JP2530877Y2 (en) 1997-04-02

Family

ID=31851078

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10540590U Expired - Lifetime JP2530877Y2 (en) 1990-10-05 1990-10-05 Free call prevention system

Country Status (1)

Country Link
JP (1) JP2530877Y2 (en)

Also Published As

Publication number Publication date
JP2530877Y2 (en) 1997-04-02

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