asterisk users - Sep 2004 - problem to reach sip client which is connected to asterisk when t he call coming from another sip server.

Hi,
I have set-up following set-up.
The sip clients is connected to the asterisk and will also be registrar in the
asterisk.
The asterisk is register like a client to our sip server with same user names
that the clients have.
When I tried to call on of the sip-clients, the asterisk answer the call instead
of forwarding the call.

Is it somebody that knows how I should set-up the configuration so the asterisk
forwarding the call?
Should I registrar the asterisk like a peer to our sip server instead of a
client?

/ Niklas