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

William A. Kay

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Area wide centrex

Telephonic communications – Special services – Service trigger
Patent

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Extension of centrex services

Telephonic communications – Special services – Service trigger
Patent

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Incoming call tracking with interactive data collection

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

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Methods and apparatus for forwarding facsimiles by phone...

Telephonic communications – Special services – Call diversion
Reexamination Certificate

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System and method for tracking and reporting incoming calls

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

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