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Unified method and apparatus to simplify telephone area code dia

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Unified method and apparatus to simplify telephone area code...

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Unified method and apparatus to simplify telephone area code...

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Unique ringing on a prime telephone

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Use of an echo canceller for the detection of CAS signals

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Reexamination Certificate

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User programmable station set bass and treble control

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

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