I don't understand the need for TWO routers. Is the wired router necessary to connect the phone system or does the phone simply connect thru an ethernet type (RJ45) cable? Sounds like you're trying to use the wireless router as a Wireless Access Point. I would do one of two things.
If the phone system will connect to the wireless router, replace the wired router with the wireless and reconfigure the network. If the phone system has to have the wired router, return the wireless router and exchange it for a Wireless Access Point.
http://www.newegg.com/app/ViewProduc...124-012&depa=5