In Cisco CCM design guide for a distributed single cluster call processing solution, it mentions that if BHCA is 10000, it needs 900KBPS for the run-time data replication between the CCMs across the WAN.
What I am not clear is when active ccm handles the call process locally why it has run-time traffic between the active server and publisher? I understand there is run-time traffic between the ccms when phone register with the ccm, but not quite know how run-time traffic involved when there are attempt calls. Thanks
1. Run-time traffic includes much of what is stored in SQL. THe fewer the changes, the less that gets replicated. Phone state information might be in there, I'm not entirely sure - but phone state information is passed between all servers.
2. The call setup does not involve any server other than the one the phone is homed to, until a phone state push or query is done.
3. The minimum *required* bandwidth is 900k. Cisco will not support doing a cluster over anything less than this. I have been down this road many times. It gets messy. Consider 900k your bottom limit.
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