4. Telephonic communications
  5. Special services
  6. Service trigger

Curtis M. Abrue

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Method and apparatus for routing calls with a digital...

Telephonic communications – Special services – Service trigger
Reexamination Certificate

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Method for providing telephone services for commercial...

Telephonic communications – Multi-line or key substation system with selective switching... – With special service
Reexamination Certificate

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Method for providing telephone services for commercial...

Telephonic communications – Multi-line or key substation system with selective switching... – With special service
Reexamination Certificate

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Rapid telephone call methods and systems

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

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