4. Telephonic communications
  5. With usage measurement
  6. Call traffic recording or monitoring

Michael D. Hoy

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Telecommunication network using signalling without activating al

Telephonic communications – Telephone line or system combined with diverse electrical... – Remote indication over telephone line
Patent

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Telecommunications network

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent

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Telecommunications networks

Telephonic communications – With usage measurement – Call traffic recording or monitoring
Patent

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Telephony network having no-ring telemetry call aborted in favor

Telephonic communications – Telephone line or system combined with diverse electrical... – Remote indication over telephone line
Patent

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