I have CM 6.1 and Exchange 2007 on lab environment. It was integrated directly, through SIP Trunk on CM. Unified Message features of Exchange works fine with one CM, but if I have CM cluster, it has issues with IP Phones registered on Subscriber (IP Phones registered on Subscriber are unable to talk to Exchange).
Exchange side allow configure just one IP for CM. I guess it can solve using IP to IP gw between both (CM Cluster <-> IP_IP_GW <-> Exchange 2007), but I want to know if someone know if it can be done without IP IP GW.
Thanks in advance.