I have a problem when I configure the Qos on our Cisco 1812 router. I use the SDM interface. When I configure the Qos either using the wizard or manually all appears ok. I'm looking to provide 30% bandwidth to VoIP traffic. The SDM sends the commands to the router the screen updates to reppesent the changes made, but if I refresh the screen display or go to a different screen then go back to the Qos setup the changes made have disappeared. I have created new rules and edited existing rules all have the same effect.