| 摘要 |
A method including creating a first set of records associated with a phone number from a database in response to a reference date; creating a second set of records associated with the phone number from the database in response to the first set of records; comparing the first set of records to the second set of records; and updating a status of the phone number in a do-not-call database in response to the comparing of the first set of records to the second set of records.
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