In one embodiment, the invention provides a method. The method includes assigning a unique telephone number to an advertiser; providing an advertisement on a media channel on behalf of the advertiser, the advertisement including one of the unique telephone number and a reference to the unique telephone...http://www.google.fr/patents/US7120235?utm_source=gb-gplus-shareBrevet US7120235 - Method and apparatus to provide pay-per-call performance based advertising
Method and apparatus to provide pay-per-call performance based advertising
