Thank you Till for your fast answer,
But still I am confuse.
First question , the ispconfig machine will act as DNS server as well? Meaning that on the client register first Name server will be onfig name?
I will give my exact configuration.
I have ISPconfig installed on ubuntu7.10 on fix ip adress public.
The name of that is ns2.voipk2.com
Then I have a client setup on ISPConfig with domain dancepartners.ca
On the registrar for domain dancepartners.ca the first ns server it is ns2.voip.ca wich are my ISPConfig server.
So, the authoritive dns server for dancepartners.ca it is my ISPConfig.
It is OK as is or I am totaly wrong?