With a BES & VPN connection deploying the Handheld Manager will allow the BlackBerry to establish a direct connection via either Bluetooth*/USB cable to the BlackBerry Enterprise Server and all would-be-wireless data will be routed through the network.
I suppose that if you do not have a VPN connection, you could install the router remotely in the DMZ and forward port 4101 to it, but you would also have to configure the router address manually in the Handheld Manager for each user. I am not sure about the authentication process, but all data is still AES or Triple DES encrypted.
*Bluetooth connection requires 4.1 Handheld and Desktop Software.
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