4. Telephonic communications
  5. Plural exchange network or interconnection
  6. Interexchange signalling
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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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User interaction procedure

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

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