4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signalling integrity protection
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Adaptive efficient single/dual tone decoder apparatus and method

Telephonic communications – Supervisory or control line signaling – Signalling integrity protection
Patent

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Apparatus and method for dual tone multifrequency signal detecti

Telephonic communications – Supervisory or control line signaling – Signalling integrity protection
Patent

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Apparatus and method for identifying speech and call-progression

Telephonic communications – Supervisory or control line signaling – Signalling integrity protection
Patent

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Apparatus and methods for electrical signal discrimination

Telephonic communications – Supervisory or control line signaling – Signalling integrity protection
Patent

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