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  5. Call signal generating
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Method and apparatus for controlling a telephone ring signal

Telephonic communications – Call signal generating
Patent

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Method and apparatus for DTMF detection

Telephonic communications – Call signal generating
Patent

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Method and apparatus for generating a ringing signal

Telephonic communications – Call signal generating
Patent

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Method and apparatus for ringing telephone stations

Telephonic communications – Call signal generating
Patent

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Method and system for implementing a ring back tone based on...

Telephonic communications – Call signal generating
Reexamination Certificate

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Method of processing phone dialing/redialing function and...

Telephonic communications – Call signal generating
Reexamination Certificate

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