I am planing to implement CER for more than 1000 IP phones but about 400 of them will be 7925. In order to be able to track the wireless phones I am going to have a different DHCP scope for each access point and then assign an ERL to the phones based upon the subnet. My question for you guys is what happens if the guy with wireless phone movers from one building to another? WIth this solution the IP address will be changed moving from one AP to another. WIll the user loss connection when the IP address changes?If so, is there a work around for this issue?