4. Telephonic communications
  5. Centralized switching system
  6. With generating of call associated substation signal

Charles R. Eberle, Jr.

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Call progress capability for a switched channel data service uni

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent

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Call progress capability for a switched channel data service uni

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent

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Call progress capability for a switched channel data service uni

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent

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Method and apparatus for echo canceler disablement

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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