4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal receiver
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Call progress decoder for multiple cadenced tones on telephone l

Telephonic communications – Supervisory or control line signaling – Signal receiver
Patent

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Called party response detecting apparatus

Telephonic communications – Supervisory or control line signaling – Signal receiver
Patent

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Circuitry for recognizing two-tone compound signals in telephone

Telephonic communications – Supervisory or control line signaling – Signal receiver
Patent

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Communications device including an improved CPE alerting...

Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate

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CPE alert signal tone detector

Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate

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Cross-frame dual tone multifrequency detector

Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate

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