4. Telephonic communications
  5. Call or terminal access alarm or control
  6. At switching center

Steve Szeto

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Digital private signaling system over internet protocol

Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate

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Line information security interface for TAPI service provider

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

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Profile ID: LFUS-PAI-P-2587278

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