GB1306701A - Telephone selection circuit - Google Patents

Telephone selection circuit

Info

Publication number
GB1306701A
GB1306701A GB275570A GB275570A GB1306701A GB 1306701 A GB1306701 A GB 1306701A GB 275570 A GB275570 A GB 275570A GB 275570 A GB275570 A GB 275570A GB 1306701 A GB1306701 A GB 1306701A
Authority
GB
United Kingdom
Prior art keywords
ringing
code
discriminator
connection
substation
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
Application number
GB275570A
Other languages
English (en)
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.)
Oberholzer M J
Original Assignee
Oberholzer M J
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 Oberholzer M J filed Critical Oberholzer M J
Publication of GB1306701A publication Critical patent/GB1306701A/en
Expired 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
    • H04M1/64—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)
  • Telephonic Communication Services (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
GB275570A 1969-01-21 1970-01-20 Telephone selection circuit Expired GB1306701A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB1306701A true GB1306701A (en) 1973-02-14

Family

ID=19805922

Family Applications (1)

Application Number Title Priority Date Filing Date
GB275570A Expired GB1306701A (en) 1969-01-21 1970-01-20 Telephone selection circuit

Country Status (6)

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

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
CH527530A (de) 1972-08-31
NL6900963A (enExample) 1970-07-23
FR2028833A1 (enExample) 1970-10-16
BE744748A (fr) 1970-07-01
DE2002160A1 (de) 1970-09-03

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee