Mitel IP Trunking on the 3300

I have a question about IP trunking and call admission control on the

I'll try to do a diagram to explain my question a little better. Imagine the following network:

A / \\ / \\ B ----- C

The lines represent the IP trunks on the 3300, not physical circuits; however, we'll assume that these sites are fully meshed from a network perspective, as well.

Now, let's say we have a maximum of three calls configured per trunk. If there are already three calls in place between A and B, what happens when one more person at A tries to call B? Will the call be blocked because the IP trunk between A and B is full, or will the 3300 at A realize that there is another path to B through C?

Thanks, John