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Abbreviated and enhanced dialing apparatus and methods particula

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

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Access code dialing apparatus and method

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

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Acoustic coupling product label and method of using

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

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Acoustic feedback suppression device particulary for auxiliary r

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

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Acoustic signal transfer device

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

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Active digit cancelling parallel dialer

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

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Adaptive call progress tone detection system

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

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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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Adaptive method and apparatus for detecting a stutter dial tone

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

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Adaptive no balance DX signalling circuit

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

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Adaptive ringer for telephone terminal

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

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Adjustable-period dual-tone multifrequency generator

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

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Alert muting method through indirect contact for portable...

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

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Alphabetic telephone dialer apparatus and method

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

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ANI auto dialer with carrier current interface

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

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Answer supervision and service selection

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

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Apparatus and method for a highly efficient low power driver...

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

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Apparatus and method for accessing and maintaining a caller-ID b

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

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Apparatus and method for audible signaling tone recognition

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

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Apparatus and method for checking signals

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