4. Telephonic communications
  5. Plural exchange network or interconnection
  6. Connection call model

John D. Hayduk

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System and method for controlling message looping between networ

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Monitoring
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System and method for providing local number portability service

Telephonic communications – Plural exchange network or interconnection – Connection call model
Patent

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Profile ID: LFUS-PAI-P-1687540

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