I currently have two sites on a LAN that are running VoIP off a cluster of CCM, which includes Pub, Sub, Unity, and CER. A total of about 180 phones exist. I have an additional 3 individual remote sites and another 3 sites that are cluster together at another campus. Considering deploying Voice, I am guessing that an SRST Router would be good at each remote site for fialover of the wan link. What is the best solution for the other campus where the 3 sites are clustered? Could I add another CCM cluster? Can the additional cluster interact with the existing cluster? Can they be confured to be primary at their sites and secondary for the other sites.
Thanks in advance.