[This question is inappropriate on this SIP List;
 moving to SIP-Implementors.]

Robert Chen wrote:
> I want to ask this question again.

Not a problem.  I apologise for the tardiness of my reply. &;)

> How can the SIP proxy server 
> get the next proxy server(hpo)? DNS can only get those SIP
> servers like, sip.domain.com
> If a sip server address like this, sip:siphappens.com, DNS can not
> get the address!

I'm not entirely sure what your differentiation here is.  If it's
that DNS can only find addresses (lets say A records) for domain
names with three "parts" (or more perhaps), then that's not the
case.  I can resolve siphappens.com as 38.196.86.5, for instance.

> So how can the my SIP proxy server get the next hop?

As you don't want to use a Location Server, per se, it should use
the procedures outlined in section 1.4.2; namely a combination of
A and SRV lookups.

I would take a look at RFCs 1034 and 2782.

HTH,


 - Jo.

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