We are on CCM 4.1.3 and I have a lab of the same version level for pilot and testing purposes. I am now getting ready to go to Cisco UCM 5.1 or 6.0. What would be my option(s) to bring up a 5.1/6.0 lab on new hardware while keeping the current 4.1.3 production intact. When ready, I will upgrade the 4.1.3 servers and still want to keep the 5.1/6.x lab. Your suggestions are appreciated very much.