Distributed Universal Number Discovery (DUNDi) is a VoIP routing protocol that provides directory services similar to what is provided by ENUM. DUNDi allows peered nodes to share dialplan information with each other. It does not actually carry any calls, but rather provides addressing information. In simple terms, it is like asking your neighbouring peer whether he knows how to reach a certain phone-extension or VoIP client. Some sort of P2P phonebook.
The protocol was invented by Mark Spencer who also made the PBX-system called Asterisk. Therefore the syntax of the output of a DUNDi-lookup can be directly used in the dial commands in an Asterisk Dial Plan.
Read more about Distributed Universal Number Discovery: Peers, Advertising Extensions, Example
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