Welcome to Mitel Forums. The Mitel resource - by techies, for techies...
So when you setup Option 125 or 128+, a PC connected through the 5485 get's on the wrong VLAN, or a PC connected to ANY phone get's on the wrong VLAN?
How about you get it working on a static port with NAC not running on it first.Are you using CDP/LLDP?If not, have you configured the options in all the Data VLANs as well as the Voice VLANs?