4. Telephonic communications
  5. Centralized switching system

Michael R. Tangeman

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Call validation system

Telephonic communications – With usage measurement – Call traffic recording by computer or control processor
Patent

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Call-processing system and method

Telephonic communications – Call or terminal access alarm or control – At switching center
Reexamination Certificate

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Call-processing system and method

Telephonic communications – Centralized switching system
Patent

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Call-processing system and method

Telephonic communications – With usage measurement – Call traffic recording by computer or control processor
Patent

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Call-processing system and method

Telephonic communications – With usage measurement – Call charge metering or monitoring
Patent

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