Using company DNS server

I need clarify if my understanding of DNS and Open Directory pertaining to OS X Server, in this case an Xserve still running Panther. I've had DNS and OD running for a couple of years now on an all Mac network(and our IS dept provides only minimal support, no user support...you get the idea). We get DNS from company servers, and I had zone records added to these servers in order to get everything up and running from my end. Now my IS dept is scanning our network for services that don't meet policy. Well my Xserve shows as a running DNS server.
So, finally to my questions. Don't I need the DNS service running on the Xserve for the OD service to function? The IS contact who brought this to my attention seems to think I should be able to turn off my DNS service, since their servers have the forward and reverse lookups.
Years back, after I knew the lookups were on there servers I added the zones to my DNS (thinking I was doing things right). So I have both an A and a PTR record on my server. Do I just remove these, stop the service, and OD will keep on ticking?
Thanks

"Don't I need the DNS service running on the Xserve for the OD service to function? The IS contact who brought this to my attention seems to think I should be able to turn off my DNS service, since their servers have the forward and reverse lookups."
He's right, you don't need to run DNS in OS X.
You just need to use any DNS with the correct settings for your server IP/name forward and reverse.

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