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Directory assistance access to intercept telephone numbers

Telephonic communications – Special services – Call diversion
Patent

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Directory assistance call processing and calling customer remote

Telephonic communications – Special services – Call diversion
Patent

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Discretionary call forwarding

Telephonic communications – Special services – Call diversion
Patent

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Double-registration avoidance method for use in registering subs

Telephonic communications – Special services – Call diversion
Patent

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DTMF control

Telephonic communications – Special services – Call diversion
Reexamination Certificate

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