Abstract: A system and method for flagging and decommissioning compromised telephone numbers prior to use for outbound calling which employ a dialing system having access to a set of direct inward dial numbers which define or correspond to telephone number identifiers, a plurality of discrete call receiving devices which operate on different telephone networks, and a server which confirms whether calls placed by the dialing system were flagged as undesirable by the call receiving devices and can modify the set of direct inward dial numbers based on such a confirmation. Through this configuration, the server is able to identify in real time whether the telephone numbers defined by or corresponding to each of the direct inward dial numbers in the set of direct inward dial numbers is compromised or is otherwise undesirable for outbound calling and then flag and decommission such a compromised telephone number.