I suggest you look into LOC DNS record type.  Then you update the loc 
record for the domainname as it moves around physically.

Here is a good link:
http://www.ckdhr.com/dns-loc/

Alternately, I'm guessing you want to do VOIP call routing. You really
need an h323 gatekeeper network to do this function.  At the moment at
least, H323 far excels SIP over call routing.  SIP has recented added
some QSIG and SS7 support, but h323 has this for about 7 years now. If
you are using SIP, I suggest looking at the SIP/H323 gateway from the
openh323 project at voxgratia.org (This gateway just converts call
signaling, not codec formats).  H323 has a steeper learning curve, but 
call routing is complicated business.

Adapting DNS for VOIP call routing is probably a long shot, but good
luck.  If you go the LOC record route (pun intended;), please let me
know how it works out.

                --Dean


On Mon, 8 Jan 2007, Alok wrote:

> Hi,
> 
> I dont know if it is fine to ask this question on an OPS list but here  
> goes anyways:
> 
> A typical connection that a customer sees is as follows:
> 
> CPE/Phone---IPswitch---------------------IPSwitch---RemoteCPE/Phone
>                |                            |
>               DNS--------------------------DNS
> 
> so i want to talk to remote-cpe.hisdomain.com
> I do a gethostbyname to get remote-cpe.hisdomain.com
> 
> it returns the IP/A record
> 
> however if remote CPE moves around say,
> remote-cpe.itspostaladdress.com
> is now
> remote-cpe.itsnewaddress.com
> 
> is there a way one can give CNAME across domains
> more like
> remote-cpe.hisdomain.com IN CNAME remote-cpe.itsnewaddress.com
> 
> I know DynDNS does this easily at the A level, but is this possible at the  
> CNAME level
> 
> -thanks
> Alok
> 
> 
> 
> _______________________________________________
> DNSOP mailing list
> [email protected]
> https://www1.ietf.org/mailman/listinfo/dnsop
> 
> 

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