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

Vulcan Research LLC

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Failsafe configuration for alternative network telephony

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

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Providing multiple line functionality using alternative...

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

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Selective processing of calls using alternative network...

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

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