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US Patent 7657009 Call block disabler

Patent 7657009 was granted and assigned to AT&T Intellectual Property I on February, 2010 by the United States Patent and Trademark Office.

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Patent abstract

A dial tone generator outputs a particular dial tone to a party to indicate that a call block feature is enabled for the party. The call block feature is disabled for the party in response to a number of incoming calls for the party being greater than or equal to a threshold.

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