DE69027417D1 - Fernsprechsysteme mit verbesserter Geheimhaltung - Google Patents

Fernsprechsysteme mit verbesserter Geheimhaltung

Info

Publication number
DE69027417D1
DE69027417D1 DE69027417T DE69027417T DE69027417D1 DE 69027417 D1 DE69027417 D1 DE 69027417D1 DE 69027417 T DE69027417 T DE 69027417T DE 69027417 T DE69027417 T DE 69027417T DE 69027417 D1 DE69027417 D1 DE 69027417D1
Authority
DE
Germany
Prior art keywords
telephone systems
improved confidentiality
confidentiality
improved
telephone
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.)
Expired - Lifetime
Application number
DE69027417T
Other languages
English (en)
Other versions
DE69027417T2 (de
Inventor
William Cumley Jones
Wayne Ronald Kalbow
Eric Tom Larsen
Elizabeth Mary Mazur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
AT&T Corp
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 AT&T Corp filed Critical AT&T Corp
Publication of DE69027417D1 publication Critical patent/DE69027417D1/de
Application granted granted Critical
Publication of DE69027417T2 publication Critical patent/DE69027417T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • H04M3/436—Arrangements for screening incoming calls, i.e. evaluating the characteristics of a call before deciding whether to answer it
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/57—Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set
    • H04M1/571—Blocking transmission of caller identification to called party
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/60—Aspects of automatic or semi-automatic exchanges related to security aspects in telephonic communication systems
    • H04M2203/609—Secret communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2242/00—Special services or facilities
    • H04M2242/22—Automatic class or number identification arrangements
    • 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
    • H04M3/42025—Calling or Called party identification service
    • H04M3/42034—Calling party identification service
    • H04M3/42042—Notifying the called party of information on the calling party
    • 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
    • H04M3/42025—Calling or Called party identification service
    • H04M3/42034—Calling party identification service
    • H04M3/42059—Making use of the calling party identifier
    • 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
    • H04M3/487—Arrangements for providing information services, e.g. recorded voice services or time announcements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/70—Identification of class of calling subscriber
DE69027417T 1990-01-31 1990-12-05 Fernsprechsysteme mit verbesserter Geheimhaltung Expired - Lifetime DE69027417T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/473,003 US5033076A (en) 1990-01-31 1990-01-31 Enhanced privacy feature for telephone systems

Publications (2)

Publication Number Publication Date
DE69027417D1 true DE69027417D1 (de) 1996-07-18
DE69027417T2 DE69027417T2 (de) 1996-11-28

Family

ID=23877784

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69027417T Expired - Lifetime DE69027417T2 (de) 1990-01-31 1990-12-05 Fernsprechsysteme mit verbesserter Geheimhaltung

Country Status (5)

Country Link
US (1) US5033076A (de)
EP (1) EP0439927B1 (de)
JP (1) JP2872416B2 (de)
CA (1) CA2030439C (de)
DE (1) DE69027417T2 (de)

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Also Published As

Publication number Publication date
EP0439927A3 (en) 1993-01-27
JP2872416B2 (ja) 1999-03-17
JPH04330898A (ja) 1992-11-18
US5033076A (en) 1991-07-16
EP0439927B1 (de) 1996-06-12
CA2030439C (en) 1994-09-13
EP0439927A2 (de) 1991-08-07
DE69027417T2 (de) 1996-11-28
CA2030439A1 (en) 1991-08-01

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8364 No opposition during term of opposition