I need some help setting up a gatekeeper on my network. We are installing 17 video endpoints (Tandberg) at 17 different sites that need to communicate with each other and our 3540 MCU back at corporate. I've read the Cisco documentation on the gatekeeper setup but have questions. Do we need to setup a seperate zone for each site? Each site has Cisco phones and their own DID block. They of course are all on different subnets as well. Any info you could pass my way on your experiences would be appreciated. One other factor is that we have about 40 users on the Cisco VT advantage as well that will need to work with the MCU and other video endpoints.