Altigen MAXCS ACC 6.0 Administration Manual page 154

Chapter 11: Board Configuration
If you have two or more HMCP Media servers, the system will provide failover in the
event that one Media server is off-line. When the Home Media server for an IP extension
is not available, the media manager in the system will search available resources from
other Media servers when that extension requests media service. This will happen
atomatically (no configuration required) and dynamically (the resource may come from
a different Media server each time that extension requests a media resource).
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MAXCS ACC 6.0 Administration Manual