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Lync from extern to extern

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Last Modified: 2013-11-29
Hello everybody, I have a specific problem from two people wanting to connect two a Lync server, each of them in their own NATed network, and the server in a NATed network itself.
It's a standard Lync server without Edge with ports 5060-5065 forwarded by the router.
Chat works, Application Sharing + A/V video however only works, if a) both are internal (same network as the server) or b) one of them is internal or connected via VPN, the other one can be external.

As I saw in the related question this can't be solved in this configuration. It is said, that thats what an Edge server (with a public not-NATed IP) is there for.

Now my question: is it technically possible to make this possible WITHOUT an Edge server, but with a second NIC in the Lync server, that will be connected to the public internet with a public non-NATed IP? Is Lync multi-NIC-able?

(Please note, that I am only talking about the technical aspect and don't want to check into the security aspect of having the primary Lync server face the internet at this time).

Thanks in advance!
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