4. Telephonic communications
  5. Multi-line or key substation system with selective switching...

Brian B. Egan

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Call trace on a packet switched network

Multiplex communications – Diagnostic testing – Determination of communication parameters
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Method and apparatus allowing remote key system units to...

Telephonic communications – Multi-line or key substation system with selective switching...
Reexamination Certificate

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Voice optimization in a network having voice over the...

Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
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