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Apparatus and method for detecting telephone line status

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

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Busy line display method

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

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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 terminal apparatus

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

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Dealing call terminal device

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

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Device for detecting operation state of telephone hook switch

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

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Extension ringing arrangement key telephone system

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

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Key telephone system

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

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Local switching system

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

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Method for exchanging a buzz signal between keyphone subsets

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

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Multi-line telephone communications system

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

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On-hook customer premise equipment alerting signal detection

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

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Page-mapped multi-line telephone communication system

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

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Private branch exchange and telephone switching system

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

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System and method for provisioning an extra line on demand...

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

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Systems and methods for voice and data communications...

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

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Telephone extension switch hook state detection system

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

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Telephone line status circuit

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

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Telephone system

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

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Trading telephone

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

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