Novel tools and techniques are provided for implementing web-based monitoring and detection of fraudulent or unauthorized use of voice calling service. In various embodiments, a computing system might receive, from a user device associated with an originating party, a request to initiate a call session with a destination party, the request comprising user information associated with the originating party and a destination number associated with the destination party; might query a database with session data (including user information) to access permission data and configuration data; and might configure fraud logic using received configuration data from the database. The computing system might analyze the session data and permission data using the configured fraud logic to determine whether the originating party is permitted to establish the requested call session with the destination party; if so, might initiate one or more first actions; and, if not, might initiate one or more second actions.