Covered here:
http://wiki.sipfoundry.org/display/sipXecs/DNS+Concepts+for+sipXecs

See - Remote Users section near bottom...

On Tue, Jan 3, 2012 at 8:58 AM, Robert B <[email protected]> wrote:

>  Tony,
>
> I looked around the wiki and couldn't find anything about split-horizon
> DNS, but I did find one about DNS views. Configuring the ACLs is easy
> enough, but I can't figure out how to get it to forward on failure.
>
> The issue will be that if I create a "ourdomain.com" zone, and populate
> it with a limited set of internal IPs only needed for SipX, queries for
> things like "www.ourdomain.com" will fail. Obviously, we do not want to
> maintain records in two places so a zone transfer setup would be in
> order... I know that I can make the zone transfer unidirectional, but I am
> not sure how to keep the public records from overwriting the internal
> records.
>
> Thoughts? Your expertise on the matter is greatly appreciated!
>
>
>
>
>
> On 1/2/2012 7:47 PM, Tony Graziano wrote:
>
> The wiki has a really good article on this.
>
> Your terminology lends some confusion though and the "zone" for "
> pbx.ourdomain.com" IS our ourdomain.com.
>
> Unless you are using a sub domain. There is a good wiki article on that
> too.
>
> In either case this is called split DNS and is pretty straightforward as
> long as your external DNS provider supports the needed record types.
>
>
>
> _______________________________________________
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> List Archive: http://list.sipfoundry.org/archive/sipx-users/
>



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