The attendee answer is sent to the owner of the invitation. If you put the booking directly in resource calendar (if you have "manager" role on its calendar), the resource will receive the answer.
If you invite simultaneously resource and people and want to receive people answer but don't want your own main calendar to be filled with these invitations, just save it into a new calendar which you exclude of your free/busy computation.
If you are the only people to book this resource, you can forward mail received by the resource to you.
Release 6.0.15_GA_2995.RHEL5_64_20111212142843 RHEL5_64 NETWORK edition.