4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection
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Method for off-hook detection during ringing and the use of a su

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

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Method for recognizing an off-hook condition on a single...

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

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Method for transmitting charging signals via a data...

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

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Method of and circuit arrangement for evaluating the output sign

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

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Method of automatic speech direction reversal and circuit config

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

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Method of determining answer supervision at a line...

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

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Musicians telephone interface

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

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