I would like to know if there is anyone that has a cluster (pub in one location, sub in another location) replicating over WAN using a single point-to-point connection (1.5Mps)
The minimum recommended bandwidth between sites that are clustered over the WAN is 1.544 Mbps. This amount allows for the minimum of 900 kbps for ICCS and 644 kbps for database and other inter-server traffic.
A maximum round-trip time (RTT) of 40 ms is allowed between any two servers in the Cisco Unified CallManager cluster. This time equates to a 20 ms maximum one-way delay, or a transmission distance of approximately 1860 miles (3000 km) under ideal conditions.
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