4. Telephonic communications
  5. Emergency or alarm communications
  6. Central office responsive to emergency call or alarm

Donald L. Sparks

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Implementing an emergency services solution

Telephonic communications – Emergency or alarm communications – Central office responsive to emergency call or alarm
Reexamination Certificate

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Line-powered network interface device

Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
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System and method for interfacing telephony voice signals...

Telephonic communications – Audio message storage – retrieval – or synthesis – Interaction with an external nontelephone network
Reexamination Certificate

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