Methods and systems for reducing the impact of fraudulent or spam calls are disclosed. One or more calls to a first phone address are received, the first phone address not currently associated with a communication for a customer prospect. The calling party phone addresses associated with the calls received prior to the association of the first phone address to the first communication are stored. Then the first phone address is associated to the first communication. A first call to the first phone address is received. Prior to answering the first call and at least partly in response to a determination that a calling party phone address of the first call matches one of the previously stored calling party phone address, the first call is identified as a spam or otherwise undesirable call candidate and may be rejected.