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  5. Call signal generating
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Change to playback characteristic of ringback tone

Telephonic communications – Call signal generating
Reexamination Certificate

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Combine audio and ringing mode

Telephonic communications – Call signal generating
Reexamination Certificate

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Computer with a modem capable of outputting telephone bell...

Telephonic communications – Call signal generating
Reexamination Certificate

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Counter based ringer interface

Telephonic communications – Call signal generating
Patent

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Current limited electronic ringing generator

Telephonic communications – Call signal generating
Patent

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