On Sat, May 8, 2010 at 1:24 PM, Robert Hoffmann <[email protected]>wrote:
> I would like to do a very basic install of sipXecs with the latest ISO. I
> have a public domain with the needed SIP records.
> Now I see that the sipX proxy is not starting because it requires a local
> DNS server with the same SIP records but pointing its local address.
> I understand that this is basically masquerading the public entries to make
> things easier at the local network - but is this mandatory by design of
> sipX?
>
No, you need split dns. REINSTALL from ISO and let sipx be your dns server
for the PC's behind nat. If on the LAN, get DNS from sipx, if outside, look
up public dns records.
>
> I have a Zyxel USG-100 Firewall/UTMA with SIP ALG and would like my SIP
> phones to use the public SIP DNS records (and the public IP) and then NAT /
> ALG the phones' requests back ("hairpin") to the sipX proxy.
>
> - I am just learning about deployment, is NATing / ALGing to "hairpin"
> the stuff a smart idea? Is it generally possible?
>
> No. You need to disable ALG/SPI on your zyxel to get remote phones to
register. It's not hairpinning, it registering to sipx, which would use a
b2bua (sipxbridge) to anchor the media and provide rtp.
>
> -
> - Whether it is smart or not, can sipX be configured to not require a
> local DNS server? - so that I can try the above?
>
> You need to dns server on sipx or a dns server INTERNALLY to host the
proper records, even if no pc points to in internally. If you have a pc
internally, it should not resolved the domain publicly.
>
> -
>
> Thank you very much for any ideas / advices. I am an IT student and have
> just started exploring the possibilities of SIP PBX deployments.
>
>
> You might consider running sipx on a subdomain instead of the domain
itself, I think that will resolve all your problems. Public dns records need
to be available, but local pc/phones need to resolve the subdomain
internally, not inside, backoutside, then back in. Noone would in their
right mind WANT to deliberately do that, so thanks for asking, but don;t do
what you asked in the first place. It's a horrible way to start learning.
>
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>
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======================
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