Patent ID: 8218741

Claim:
A computer-implemented method, comprising: associating a first telephone number with a second telephone number; serving a web-based advertisement for an advertiser that includes the first telephone number; receiving a call placed to the first telephone number; routing the call to the second telephone number based on the association of the second telephone number with the first telephone number; determining whether a call-through event in response to receiving the call placed to the first telephone number has occurred; and charging an advertiser associated with the second telephone number a cost-per-call amount if the call-through event is determined to have occurred wherein determining whether the call-through event in response to receiving the call placed to the first telephone number has occurred comprises: identifying a calling number associated with an origination of the call; determining whether the calling number has originated calls to the first telephone number in excess of a threshold number of originations; and precluding the identification of the occurrence of a call-through event for the second telephone number if the calling number has originated calls to the first telephone number in excess of the threshold number of originations.