The DUNDi protocol is used to dynamically look up the VoIP address of a phone number on a network, and to connect to that address. Unlike the ENUM standard, DUNDi has no central authority. The dundi.conf file contains DUNDi extensions used to control what is advertised; it also contains the peers to whom you will submit lookup requests and from whom you will accept lookup requests. The DUNDi protocol was explored in Chapter 14, Potpourri.