Control ActiveSync Connections from DC

Control ActiveSync Connections from DC

Currently, ActiveSync is disabled on all Exchange mailboxes in our company (since we use older Blackberries). Since we are looking at migrating to iPhone/Android, we will need to enable ActiveSync for users. However, in our company we only want to allow company-provided devices to have email, and not allow users to have corporate email on their own personal iphones and ipads.
 
Obviously we can control Desktop Central MDM activations with one-time codes, but this wouldn't prevent a user from just activating a device directly to Exchange. Is there some way this can be controlled / brokered with Desktop Central -- for example, only allow ActiveSync connections from Desktop Central activated devices...
 
Just curious, as most other MDM providers offer this, and this is a key requirement for us...

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