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

Hyung-Woon Choi

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Interfacing between independent voice mail system and exchange

Telephonic communications – Audio message storage – retrieval – or synthesis – Multilingual system or operation
Patent

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Technique for detecting call metering in key telephone system

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

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Profile ID: LFUS-PAI-P-532746

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