Design for MU - Exchange centralized, distributed to the unit question

Here's the situation. Please let me know if I'm understanding correctly.

Two centers of data, Europe and CONUS, centralized Exchange servers to support remote offices. Most remote sites in Europe have the average response time ~ 150ms, but AsiaPac is on the order of ~ 300ms.

Each remote office would get a manager calls and a local system of the unit. The unity system would be storing voicemail in case of failure of the connection to the data center, give language-specific greetings, etc..

If the link between the office and the data center is in place, then the machine of the unit will then send computers virtual to the Exchange Server, which would then put the virtual computer in box mailbox users.

If the link does not work, it will store voicemails. Users will always be able to get new VM messages since they will be on their box of the local unit.

Users will be able to listen to the old VM messages if they are configured to download e-mail on their local machine since at this time, it's just another email.

I've been through the design guide and want to ensure that I understand that this is not a recommended solution? None of the offices have a local Exchange Server. The latency is going to be a deal breaker for a deployment of UNIFIED messaging?

It would certainly not be a supported configuration. The unit must me on the same LAN as the server Exchange, MS, GC. Communication between Exchange and the unit is very sensitive to time and cannot tolerate delays or package loses all. Just me that you plan now flat will not work.

So in this model, you will need to have the unit in the data center or choose a VM solution. With the servers in the data center, they would register in CM over the WAN, but you would need QoS are configured for voice traffic. But in the case where the Wan came down people would not be able to get to voicemail.

The other option would be for you to have the CM and the unit in the data center and use SRST at remote sites:

http://Forum.Cisco.com/eForum/servlet/NetProf?page=NetProf&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.1dd62348

I know have enough details to know if it will work for you, but you can check it out.

Thank you

Keith

Tags: Cisco Support

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