[cisco-voip] Unity Failover across WAN

[Adam Blomfield]

I have a customer that is implementing a DR site across a 20mb/s MPLS
network and we are trying to work out what voice services we can make
redundant. I know that we can cluster CUCM server across a WAN link of that
size, but according to the Unity Design Guides we shouldn't even consider
trying to attempt Unity Failover without 100 or 1000mb/s. Is this accurate?
Those requirements seem huge! Is there any way to try and provide a
redundant Unity box across a network connection like this? We are
considering just having a standalone Unity box over there that can split the
mailbox load with the existing server, as well as having the Call Handlers
set up on both of them so in the event of a failure the VM profile can be
changed on the CTI ports to fail a main number over to the second server to
allow calls to still roll in to the Call Handler. Does this make sense, or
is there a better way to do this?

-Adam
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