So I'm looking to get some more information on bandwidth requirements for primary and secondary subscriber sites for a potential global deployment. Is there a guide somewhere that shows you what bandwidth per phone (for example) is required?
Here you go. Check out the SRND for more info, linked below (which I believe Sankar already linked).
?Every 10,000 busy hour call attempts (BHCA) between sites that are clustered over the WAN requires 900 kbps of bandwidth for Intra-Cluster Communication Signaling (ICCS). This is a minimum bandwidth requirement, and bandwidth is allocated in multiples of 900 kbps. The ICCS traffic types are classified as either priority or best-effort. Priority ICCS traffic is marked with IP Precedence 3 (DSCP 24 or PHB CS3). Best-effort ICCS traffic is marked with IP Precedence 0 (DSCP 0 or PHB BE).
?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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