Configuring Asterisk to work with Fedora DNS Server

Hello, I am running Fedora Core 6 and its built-in DNS Server (named). All I want to know is what to change in sip.conf or extensions.conf to make the Asterisk server query my DNS server for addresses when a SIP call comes in. I have already turned on srvlookup for my Asterisk Server. Any suggestions?

P.S. The forum search tool doesn’t work very well :confused: