I'm running multiple CCMs version 4.x across 6 offices. I need to install Cisco IPT on one more remote office and my plan was just to add one Subscriber to existing CCM 4.2 cluster. Cisco recently announced EOS for CCM 4.2. Now, I'm not sure what is the best way to proceed. If I decide to go with new version 6 then I'll need to upgrade many offices and it will not be easy. What do you suggest? Should I stay with version 4?