how to setup a voip router behind a router which connect to a pc

I had a D-Link wireless router DI 524 connect to the internet and pc. and I need to put my Linksys VOIP router SPA 2102 separately behind the D-Link router. I had tried to change the LAN IP to 192.168.200.1 in SPA2102, so it is not the same with my di524. and also change the spa2102 in bridge mode. i had tried most setting still no luck to get the spa2102 working with my phone. could someone tell me how can i config the setting either in di524 or spa2102 to work together?
thanks