I am trying to plug a Linksys SFE2000P in the expansion port of a UC500 to add some extra phones to a system. I preconfigured the phones directly connected to the UC500 before I moved them over to the Linksys. I cannot get them to work while connected to the Linksys. It just says "Configuring IP." Does anyone have any tips for configuring this switch to work with the UC500?