Is it possible that Exchange UM could be configure with two call managers over the same sip?

Hi,
I have Cisco call manager 8.2 integrated with Microsoft Exchange Server 2010 Unified Messaging.
Call manager has primary and secondary server. I created a sip trunk and linked primary CUCM with Exchange. Users can leave and get voice mails.
Problem: In case that primary server is down (WAN is down) the users registered on secondary server but they cannot contact to Exchange Unified Messaging.
I added  new UM Dial Plan with the same pilot and associated it to the secondary CUCM server. UM answered but do not recognize the extension number "is not a valid mailbox extension".
Is it possible that Exchange UM could be configure with two call managers over the same sip, the same pilot number, different associated UM servers and get access to the same voice mail boxes?
If not:
Does exist a way to configure Exchange UM that will work if one CUCM server is down?
Thank you,
Peter

Hi,
I have Cisco call manager 8.2 integrated with Microsoft Exchange Server 2010 Unified Messaging.
Call manager has primary and secondary server. I created a sip trunk and linked primary CUCM with Exchange. Users can leave and get voice mails.
Problem: In case that primary server is down (WAN is down) the users registered on secondary server but they cannot contact to Exchange Unified Messaging.
I added  new UM Dial Plan with the same pilot and associated it to the secondary CUCM server. UM answered but do not recognize the extension number "is not a valid mailbox extension".
Is it possible that Exchange UM could be configure with two call managers over the same sip, the same pilot number, different associated UM servers and get access to the same voice mail boxes?
If not:
Does exist a way to configure Exchange UM that will work if one CUCM server is down?
Thank you,
Peter

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