Microsoft Exchange 2010 and outlook/sync issue

Current Senario.

We have a primary site and a DR site. Exchange2010 is on primary site replicating traffic to DR Exchange. Active Sync is enabled for iphones and android phones. When the primary exchange goes into update mode and takes a rather long time to come back up, Database fails over to DR Exchange. In doing so, the Active Sync settings change on all iphone and android device. The server name changes from a .com to a .local. When we mount the primary database back ,the active sync settings do not roll back, hence making our IT deptartment run around changing all the phone settings back to the primary exchange. Is there a way to fix this? Or possibly change the DR site to point to the .com server name?

thanks in advance
ferranti02Asked:
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Ilya RubinshteynCommented:
Are you using DAG for DR? the best way to set this up is to have a CAS server at each site and have a dynamic DNS pointing to the server that is up. You will need to ensure that both internal server names are on the Exchange certificate to ensure active sync functionality.
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ferranti02Author Commented:
Yes i am using a DAG. The CAS Server is with the Transport Server as well. Actually all the servers are on one Server.
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Ilya RubinshteynCommented:
Are your outlook clients having the same issues? if not, create 2 DNS entries for you mail domain: primary.contoso.com, secondary.contoso.com. Set the TTL to something like 1 hour. This will force the phones to connect to the correct CAS server once the primary DB is up. An alternative is to use a dynamic DNS service to do this for you.
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