For that, configure VPN so that remote users can access anything from anywhere.
Alternatively just forward the needed ports on then internet router, and users will only access what you configured for.
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The uc540 is being used as the gateway and I wanted to try to avoid VPN because the office mainly operates out of terminals. Is this still possible?
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This is possible. Here is what you need to do.
In your LAN you need to setup an A record that points to CUE. Then on your firewall you need to open the IMAP port and point it to CUE. Setup an A record on your public DNS that points to your external address that is NAT'ing to CUE. Make sure the A records you create on the LAN and the public DNS are the same.
Let me know if you need any further assistance.
The other method I often used which worked well for me, is create an IMAP account in the users outlook/exchange and then get the Smart Phone to talk to exchange, this way all your outside communications is done to the exchange and you can apply corporate policies to it
There is always more than one way to kick the can