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unified messaging exchange 2013 / lync 2013

In my scenario i have 3 multi-roled exchange 2013 servers

The dial plan and auto attendant lives all  3 exchange servers?

you would need to implement a DAG because if server 1 is down, then voice mail won't be delivered to the mailboxes in database 1 and that is on server 1?
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cmatchett
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cmatchett
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chlebiTeam Leader IT InfrastructureCommented:
Yes, that is right. You need to have DAG so a mailbox database can be activated on more than one node and voice mail can be delivered if one node fails.
Also keep in mind that you need to have some kind of failover scenario for the servers receiving the calls -  for example you can use Windows NLB to route callls to several UM servers - not sure about your setup whether the UM role is also combined with something else.
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cmatchettAuthor Commented:
we are using a hardware load balancer.  So the dial plans and auto attendant live on all servers?  that would make sense to me.
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chlebiTeam Leader IT InfrastructureCommented:
Yes, that makes sense providing you load balance between servers that have UM role installed.
Then if your entry point for SIP calls are handled using above you need to make sure you have two CAS and HUB roles to have redundancy on transport and client access and also bring DAG into the mix for database high availability.
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