4. Telephonic communications
  5. Plural exchange network or interconnection
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Unified method and apparatus to simplify telephone area code...

Telephonic communications – Plural exchange network or interconnection
Reexamination Certificate

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Uniform control of mixed platforms in telephony

Telephonic communications – Plural exchange network or interconnection
Reexamination Certificate

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Universal DC signalling detector

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent

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Universal PBX interface

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent

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Universal PBX interface

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent

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Use-code based call-treatment selection

Telephonic communications – Plural exchange network or interconnection
Patent

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User interaction procedure

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent

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Using remote processors to generate routing information to...

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

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