4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection
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Detecting whether a telephone line has been disconnected

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Device and method for cleaning telephone number list

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Device for detecting DTMF tones

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Device for detecting telephone line seizure

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Reexamination Certificate

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Device for identifying line reversal/ringing signal of a telepho

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Dial pulse detector and detecting method for paging service for

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Disconnect signalling detection arrangement

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Double duty capacitor circuit and method

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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