Computer implemented methods of tracking client device activity on a web site are provided. Certain embodiments of tracking methods allow client device activity on one communication network (e.g. web pages viewed via the Internet) to be correlated to subsequent communications on a second communications network (e.g. a telephony network). Other embodiments include the ability to track client device activity across one or more web servers. Certain embodiments include the ability to use a limited pool of selectable addresses on one network (e.g. phone numbers) to correlate to a wide range of client device activity on another network. Reports may be generated that summarize the collected and correlated tracking information.