A provisioning server implements a telephony service associated with a user, in which calls involving a directory number of the user are processed in accordance with the telephony service and customized call service data. The provisioning server interfaces a call processor with a web server and an interactive voice response (IVR) platform. The provisioning server includes a first interface for receiving the customized call service data from the web server, and a second interface for receiving at least portion of the customized call service data from the IVR platform. The provisioning server also includes a third interface for sending the customized call service data to be stored in a database accessible to the call processor. An instruction is received over the first interface or the second interface to activate the telephony service, in accordance with the customized call service data, via one of the web server and the IVR platform.