Physical phone we always give it a vlan.
This vlan gets a high priority in the switch.
So i also want my 3cx softphone client to add this vlan tag to the ip package.
you will not be able to do this with 3cxphone for windows. the only way to do it would be have 2 nic cards and have one on the voice vlan for the 3cx phone and the other for normal traffic.