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Call coverage arrangement

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

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Call processing system with resources on multiple platforms

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

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Call progress tone system

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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Call waiting notifying apparatus

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

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Calling signal controller

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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Calling system for enabling speech transmission from a caller to

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

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Central office control of receive and transmit handset volume

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

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Circuit and method for reducing common mode interference in tele

Telephonic communications – Multi-line or key substation system with selective switching...
Patent

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Collective-house control system employing an interface circuit f

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Patent

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Communication apparatus having a communication hold function

Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Patent

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Communication apparatus with private branch exchange for communi

Telephonic communications – Multi-line or key substation system with selective switching... – With exclusion or priority feature
Patent

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Communication console station with priority queuing

Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Patent

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Communication system having dynamically assigned station set but

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Patent

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Communication system having multi-mode line selection buttons

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

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Communication system having separate unidirectional information

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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Communication system with assembly carrier unit

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Reexamination Certificate

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Communication terminal apparatus

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Patent

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Concurrent hunt group searching methods and arrangements

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

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Control and interface apparatus for telephone systems

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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Control of incoming and outgoing calls in a key system

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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