A client device, e.g., a smartphone including a web browser, requests a call authorization token from a web server, e.g., a web page server. The web server, acting on behalf of a company, whose web page is hosted and whose phone corresponds to the called party, screens incoming requests and decides whether or not to issue an authorization token, e.g., a signed token including an encrypted portion. The web server issues a call authorization token and communicate the issued token to the client device. The client device includes the received issued call authorization token in a signal, e.g., a SIP INVITE signal, which it generates and sends to a session border controller (SBC). The session border controller processes the received authorization token and checks the authorization token to validate the received token. The SBC establishes a communications session if the received token passes the validation check.