NL6900963A - - Google Patents

Info

Publication number
NL6900963A
NL6900963A NL6900963A NL6900963A NL6900963A NL 6900963 A NL6900963 A NL 6900963A NL 6900963 A NL6900963 A NL 6900963A NL 6900963 A NL6900963 A NL 6900963A NL 6900963 A NL6900963 A NL 6900963A
Authority
NL
Netherlands
Application number
NL6900963A
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 NL6900963A priority Critical patent/NL6900963A/xx
Priority to DE19702002160 priority patent/DE2002160A1/de
Priority to CH67570A priority patent/CH527530A/de
Priority to FR7002187A priority patent/FR2028833A1/fr
Priority to GB275570A priority patent/GB1306701A/en
Priority to BE744748D priority patent/BE744748A/xx
Publication of NL6900963A publication Critical patent/NL6900963A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • 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)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Telephonic Communication Services (AREA)
NL6900963A 1969-01-21 1969-01-21 NL6900963A (xx)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL6900963A NL6900963A (xx) 1969-01-21 1969-01-21
DE19702002160 DE2002160A1 (de) 1969-01-21 1970-01-19 Waehlschaltung
CH67570A CH527530A (de) 1969-01-21 1970-01-19 Schaltung in einer mit einem automatischen Antwortgeber versehenen Teilnehmerstation in einer Fernsprechanlage
FR7002187A FR2028833A1 (xx) 1969-01-21 1970-01-20
GB275570A GB1306701A (en) 1969-01-21 1970-01-20 Telephone selection circuit
BE744748D BE744748A (fr) 1969-01-21 1970-01-21 Circuit selectif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6900963A NL6900963A (xx) 1969-01-21 1969-01-21

Publications (1)

Publication Number Publication Date
NL6900963A true NL6900963A (xx) 1970-07-23

Family

ID=19805922

Family Applications (1)

Application Number Title Priority Date Filing Date
NL6900963A NL6900963A (xx) 1969-01-21 1969-01-21

Country Status (6)

Country Link
BE (1) BE744748A (xx)
CH (1) CH527530A (xx)
DE (1) DE2002160A1 (xx)
FR (1) FR2028833A1 (xx)
GB (1) GB1306701A (xx)
NL (1) NL6900963A (xx)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793487A (en) * 1971-11-22 1974-02-19 J Kilby System for screening telephone calls
JPS62163445A (ja) * 1986-01-14 1987-07-20 Mitsubishi Electric Corp 電話切換装置

Also Published As

Publication number Publication date
FR2028833A1 (xx) 1970-10-16
BE744748A (fr) 1970-07-01
CH527530A (de) 1972-08-31
DE2002160A1 (de) 1970-09-03
GB1306701A (en) 1973-02-14

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Legal Events

Date Code Title Description
BV The patent application has lapsed