Alloka is a successful startup call-tracking service that was set up in 2010. Service gives you an opportunity to track the sources and properties of clients’ calls.
Alloka defines the source of the call with a help of trekking numbers. Site visitors see the different numbers on the web-site but when number is dialed it redirects you to the original number of site owner. The numbers are rotated by revolver principle - first user gets the first number, second user - the second one.