4. Telephonic communications
  5. With usage measurement
  6. Call charge metering or monitoring

David D. Kaufman

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Method and apparatus for the billing of value-added communicatio

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

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Method and apparatus for the billing of value-added communicatio

Multiplex communications – Wide area network – Packet switching
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Profile ID: LFUS-PAI-P-847622

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