4. Telephonic communications
  5. Plural exchange network or interconnection
  6. With interexchange network routing
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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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Failsafe configuration for alternative network telephony

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

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Feature interactions

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing
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Feedback to calling communication device on call connected...

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

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Feedback to calling communication device on call connected...

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

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Flexible communication systems and methods

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