Visitor Level Tracking
When a visitor comes to the site for the first time a unique Infinity Visitor ID is created and stored in a first party cookie. The visitor is also allocated a dynamic tracking phone number from a number pool for the period of time they are browsing the site.
If the visitor calls the dynamic tracking number they are shown either during or shortly after their visit to the site, Infinity can associate the call to that visitor. In tests this gave a 97-99% accuracy of matching the call to the correct visitor.