Abstract: An advertising/revenue generation system for use with telecommunication systems. A database can be organized or sorted on parameters relating to telecommunication, such as caller demographics, time and place of a call, and the services of the initially dialed number. Advertisers can submit advertisements to the advertising system. When a caller submits a communication request, for example by entering a telephone number into a communication device, the advertising system recognizes the request and accesses the database. The advertising system determines advertisements that are related to the caller's communication request and telecommunicates relevant advertising content to the caller. The content can be provided before, during, and/or after the caller establishes communication as initially requested.