KR890021981U - Phone call control circuit - Google Patents

Phone call control circuit

Info

Publication number
KR890021981U
KR890021981U KR2019880006310U KR880006310U KR890021981U KR 890021981 U KR890021981 U KR 890021981U KR 2019880006310 U KR2019880006310 U KR 2019880006310U KR 880006310 U KR880006310 U KR 880006310U KR 890021981 U KR890021981 U KR 890021981U
Authority
KR
South Korea
Prior art keywords
control circuit
call control
phone call
phone
circuit
Prior art date
Application number
KR2019880006310U
Other languages
Korean (ko)
Other versions
KR940000960Y1 (en
Inventor
이강우
Original Assignee
주식회사 금성사
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 주식회사 금성사 filed Critical 주식회사 금성사
Priority to KR2019880006310U priority Critical patent/KR940000960Y1/en
Publication of KR890021981U publication Critical patent/KR890021981U/en
Application granted granted Critical
Publication of KR940000960Y1 publication Critical patent/KR940000960Y1/en

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
    • H04M1/667—Preventing unauthorised calls from a telephone set
    • H04M1/67—Preventing unauthorised calls from a telephone set by electronic means
    • H04M1/673—Preventing unauthorised calls from a telephone set by electronic means the user being required to key in a code

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
KR2019880006310U 1988-04-30 1988-04-30 Unauthorized out-bound call restriction circuit KR940000960Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019880006310U KR940000960Y1 (en) 1988-04-30 1988-04-30 Unauthorized out-bound call restriction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019880006310U KR940000960Y1 (en) 1988-04-30 1988-04-30 Unauthorized out-bound call restriction circuit

Publications (2)

Publication Number Publication Date
KR890021981U true KR890021981U (en) 1989-11-03
KR940000960Y1 KR940000960Y1 (en) 1994-02-25

Family

ID=19274737

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019880006310U KR940000960Y1 (en) 1988-04-30 1988-04-30 Unauthorized out-bound call restriction circuit

Country Status (1)

Country Link
KR (1) KR940000960Y1 (en)

Also Published As

Publication number Publication date
KR940000960Y1 (en) 1994-02-25

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Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
REGI Registration of establishment
FPAY Annual fee payment

Payment date: 19991228

Year of fee payment: 7

LAPS Lapse due to unpaid annual fee