4. Telephonic communications
  5. Plural exchange network or interconnection
  6. With interexchange network routing

Dean C. Boldt

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Call progress tone generation in a communication system

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Reexamination Certificate

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Call progress tone generation in a communication system

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Reexamination Certificate

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Call progress tone generation in a communication system

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Reexamination Certificate

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System and method for processing a call

Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
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System and method for processing ported calls

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing
Reexamination Certificate

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