"Last week we learned how to use FreeWorldDialup to connect to
other VoIP users. Today we'll set up distributed Asterisk peering
with the DUNDi (Distributed Universal Number Discovery) protocol.
DUNDi is a peer-to-peer system for finding Internet gateways to
telephony services. It operates like a blend of DNS and routing,
only there is no central authority analogous to the root DNS
servers. All participants publish their own authoritative routing
information and share it with authorized peers. When Server A wants
to know how to connect to Server B, it asks around until it
receives an answer. Then it stores the information so that it can
also respond to requests. You have complete control over what
information and resources you choose to share—it's not a
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