4. Telephonic communications
  5. Special services
  6. Repetitive call attempts

Chi K. Lam

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Dual-tone multi-frequency signal transfer protocol

Telephonic communications – Telephone line or system combined with diverse electrical...
Patent

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International call back technique with reduced post dialing dela

Telephonic communications – Special services – Repetitive call attempts
Patent

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Method for initiating a telephone call on a remote line

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Patent

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Profile ID: LFUS-PAI-P-1400083

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