Is it possible to use a single Unity 4.2 for (1) CCM 4.2 and (1) CUCM 7.1 cluster at the same time? For example, splitting the ports to both clusters. We have a large (>30K) VoIP deployment and need to upgrade the Callmanager cluster and Unity, so this is for migration purpose.
Yes, you can do this. You will need to upgrade the TSP to ensure compatibility with CUCM 7.x and manage two integrations (within UTIM) but it can be done. Go here:
From there, look for a link and section titled "Multiple Clusters".
Should get you what you need.
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