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ENUM
A way to query E.164 numbers to keep calls "on-net".
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These records can give you a pseudo redundant network. Allowing failover (or pseudo load-balancing) to other servers in your network.
ITAD (ISN)
E-Mail style phone numbers that more easily allow cross-domain calls to stay "on-net" without the need for a full keyboard on your telephone (i.e. analog telephones hooked up to analog adapters). A typical number will look similar to 123*543.
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All of the following commands are input from the nsupdate command line. You should first have a key that you can use for updating a single zone.
ENUM
update add 3.2.1.enum.org 60 NAPTR 100 10 "u" "E2U+sip" "!^.*$!sip:123@freeswitch.org!" .
If a user dials 123, this will route the call to 123@freeswitch.org provided enum is correctly configured to use your zone.
ISN
update add 3.2.1.543.freenum.org 60 NAPTR 100 10 "u" "E2U+sip" "!^.*$!sip:123@freeswitch.org!" .
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(RFC 3263 is not too hard to read, for a change -- it's certainly shorter than RFC 3261, and it even has an ASCII art diagram :).