A business can register a finite state machine with a server. This finite state machine can express a tree structure of menus. The registration can cause the finite state machine to be mapped to the business's telephone number on the server. A mobile device can receive user input that manifests the intent to make a telephone call. In response to receiving the user input, the mobile device can determine that the telephone number that the user intends to call is mapped to a business's registered finite state machine on the server. The mobile device can then cause menus of selectable options, indicated in the business's registered finite state machine, to be displayed to the user in an interactive manner instead of placing the telephone call that the user intended to make.