Tftp trunk

HI

My ISP service provide me a router and placed a Alcatel-Lucent phone (IP phone) to me. this Device is working as IP phone for incoming call. and it configuration is below

IP 192.168.255.195
sub 255.255.255.224
router 192.168.255.193
TFTP1 192.168.92.246
TFTP2 255.255.255.255

CPU1 192.168.92.246
CPU2 255.255.255.255

So please let me know how can i configure this ip in my freePbx to receive calls from FreePBX