This is not my article I copy and pasted if from the below. The only reason it’s on here is because it took me a while to find so I figured I would put it here since it’s useful to me. Enable voice VLAN on Cisco switches for non-Cisco phones by lunarg on February 20th 2017, at 14:53 When provisioning non-Cisco phones on a Cisco-switched network, you may notice that the configured voice VLAN is not correctly provisioned to the phone.