Systems and methods to selectively block calls from reaching destinations based on an input received from a callback connection. One embodiment includes a web server to receive a selection of an advertisement from an customer and to obtain a communication reference from the customer in response to the selection; a session border controller to interface with a packet switched network; and one or more telecommunication servers coupled to the session border controller and the web server, the one or more telecommunication servers to establish a connection for real time communications using the communication reference, to initiate a connection for real time communications with an advertiser of the advertisement after receiving an indication of acceptance of the connection established using the communication reference; where the advertiser is charged an advertisement fee in response to establishing a connection for real time communications between the advertiser and the customer.