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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. == Peers == For DUNDi to work, each DUNDi client has to know at least one other DUNDi client. Since these DUNDi clients belong to the same network, they are called peers. Also at least one of the reachable peers must know how to reach the wanted extension. In the DUNDi configuration one can limit the number of consecutive lookups between peers by setting the TTL. * A TTL of 1 means you only can ask the peers you know and they cannot ask further. * A TTL of n means that the peer you ask for a lookup can redirect your lookup to the peers it knows, only with a TTL of n-1. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「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.== Peers ==For DUNDi to work, each DUNDi client has to know at least one other DUNDi client. Since these DUNDi clients belong to the same network, they are called peers.Also at least one of the reachable peers must know how to reach the wanted extension.In the DUNDi configuration one can limit the number of consecutive lookups between peers by setting the TTL.* A TTL of 1 means you only can ask the peers you know and they cannot ask further.* A TTL of n means that the peer you ask for a lookup can redirect your lookup to the peers it knows, only with a TTL of n-1.」の詳細全文を読む スポンサード リンク
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