We have been trying to setup a Video Conference Unit on our 540 unit with a split tunnel out to the internet. Keep running into problems. We tried to create a Vlan with just private address and then Nat to a public but that didn't work. Then we tried just to use the Public addresses out, which we were able to get out but nothing back in. Need some help to configure it.
Is your issue resolved? If not, can you please provide a topology diagram and output of NAT entries. Is your Video Traffic going over the overlay or direct via underlay?