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"Plug and play" telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
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“Pull” architecture contact center

Telephonic communications – Centralized switching system – Call distribution to operator
Reexamination Certificate

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“Roaming” method and apparatus for use in...

Telephonic communications – Special services – Service profile
Reexamination Certificate

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2-wire/3-wire converting apparatus

Telephonic communications – Subscriber line or transmission line interface
Patent

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20 Hz ring generator using high frequency PWM control

Telephonic communications – Call signal generating
Patent

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2nd level power fault testing apparatus for testing...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Reexamination Certificate

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2nd level power fault testing apparatus for testing...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Reexamination Certificate

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3-Way call detection system

Telephonic communications – Call or terminal access alarm or control – Fraud or improper use mitigating or indication
Reexamination Certificate

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3-way call detection system and method

Telephonic communications – Call or terminal access alarm or control – Fraud or improper use mitigating or indication
Reexamination Certificate

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3-Way call detection system and method

Telephonic communications – Call or terminal access alarm or control – Fraud or improper use mitigating or indication
Reexamination Certificate

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3D view of incoming communications

Telephonic communications – Audio message storage – retrieval – or synthesis – Display of message related information
Reexamination Certificate

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5 volts single power supply ADSL analog front end design

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Reexamination Certificate

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800 number callback

Telephonic communications – Special services – Anonymous party
Patent

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9-1-1 Switched access system

Telephonic communications – Emergency or alarm communications – Central office responsive to emergency call or alarm
Patent

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911 emergency voice/data telecommunication network

Telephonic communications – Emergency or alarm communications – Central station with plural substations
Reexamination Certificate

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911 status system and method

Telephonic communications – Emergency or alarm communications
Reexamination Certificate

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AA battery cellular phone

Telephonic communications – Terminal – Housing or housing component
Patent

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Abandoned call control and indication

Telephonic communications – Special services – Anonymous party
Patent

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Abbreviated and enhanced dialing apparatus and methods particula

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
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Abbreviated and enhanced dialing apparatus and methods particula

Telephonic communications – Supervisory or control line signaling – Substation originated
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