[Asterisk-Users] LCR with ENUM and DDNS: half the story

[Olle E. Johansson]

Brian West wrote:

> Also I must point out that your NAPTR record is a bit wrong:
> 
> wrong:(bind9)
> "!\\\\+(.*)!iax2:foofone/\\\\1!"
> 
Read again, Brian.
The text clearly states that the shell eats up one of the slashes, so we have to
double-quote.

The only part I would add is the advice to make sure that you have bind 9 on both
master and slave servers, otherwise you propably will file bug reports on the
wrong piece of software...

/Olle ;-)
> 
> On Sun, 30 Nov 2003, William Waites wrote:
> 
> 
>>Ok, so you've read the Wiki and gotten call routing using ENUM to work
>>(http://www.voip-info.org/tiki-index.php?page=Asterisk%20E164%20Call%20Routing)
>>with your own ENUM-alike domain, e164.example.com.
>>
>>But how do you populate it with data? You can do it manually, but that gets
>>very tedious very quickly. Or you can use the nifty DDNS updating program
>>that comes with bind9.
>>
>>The first thing is to set configure your e164.example.com to allow ddns updates.
>>A very good document describing how to do this (just ignore the DHCP stuff) is
>>http://ops.ietf.org/dns/dynupd/secure-ddns-howto.html
>>
>>In a nutshell (I used TSIG keys for simplicity, the procedure is analogous with
>>SIG(0) asymettric keys) this is how you do it.
>>
>>On the client computer that will be allowed to update the database do:
>>
>>% dnssec-keygen -a HMAC-MD5 -b 512 -n HOST client.example.com
>>Kclient.example.com.+157+13404
>>
>>This creates the shared key, which will live in a file called
>>Kclient.example.com.+157+13404.key and .private
>>
>>% cat Kclient.example.com.+157+13404.private
>>Private-key-format: v1.2
>>Algorithm: 157 (HMAC_MD5)
>>Key: I9FvX+F3fcSVLkzlPSVR9THww+oN6o0mj/JgKTu9auzMx0IM7lmBd9RIfk2cbHvoV9drGQVsk+svkrf+AeN0JQ==
>>
>>Now on the server, let that key update e164.example.com. To do this, change named.conf
>>to have
>>
>>key "client.example.com." {
>>	algorithm HMAC-MD5;
>>	secret "I9FvX+F3fcSVLkzlPSVR9THww+oN6o0mj/JgKTu9auzMx0IM7lmBd9RIfk2cbHvoV9drGQVsk+svkrf+AeN0JQ==";
>>};
>>
>>zone "e164.example.com" {
>>	type master;
>>	file "dynamic/e164.example.com";
>>	update-policy {
>>		grant client.example.com. subdomain e164.example.com. ANY;
>>	};
>>};
>>
>>and restart the nameserver.
>>
>>That's it for the configuration.
>>
>>Now, say you have just found a very good IAX2 peer, FooFone that offers /wonderful/ rates
>>to the ficticious country code 666. You can use a script like this, to tell the
>>asterisk application EnumLookup (see the howto above) to use this peer for that country:
>>
>>#!/bin/sh
>>
>>TTL=3600
>>SERVER=nameserver.example.com
>>SERVER=sparx
>>ZONE=e164.example.com
>>KEYFILE=Kclient.example.com.+157+13404.key
>>
>>nsupdate -v -k ${KEYFILE} << EOF
>>server ${SERVER}
>>zone ${ZONE}
>>update delete *.6.6.6.e164.example.com.
>>update add *.6.6.6.e164.example.com. ${TTL} NAPTR 100 100 "u" "E2U+IAX2" "!\\\\+(.*)!iax2:foofone/\\\\1!" .
>>update add *.6.6.6.e164.example.com. ${TTL} TXT "greate $0.00/minute rate from FooFone!"
>>show
>>send
>>EOF
>>
>>the first update line deletes any existing records for +666, the second adds the NAPTR
>>record for ENUM call routing, and the third adds a nice informational message in the DNS
>>which is useful if you want a quick way to find out how much a call will be billed at.
>>
>>Note the escaped-escaped-escape characters. The first is because the shell will try to
>>interpret \, so what actually gets sent to nsupdate is \\ which is correct for what BIND
>>wants.
>>
>>And the second half of the puzzle? Figuring out how to know what to put in the DNS,
>>calculating the best rates...
>>
>>Hope someone finds this useful,
>>-w
>>--
>>/~\  The ASCII Ribbon Campaign
>>\ /    No HTML/RTF in email
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>>/ \  Respect for open standards
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>>
> 
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*** Olle E. Johansson, oej at edvina.net

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